Archive Research News

Home

What's New

Newsletter

Library

E-Pal Bulletin Board

Leaflets

Services

Membership

Contact Details

Links

Your feedback

Search / Site map


About Crohn's Disease

About Ulcerative Colitis


Infliximab Benefit Consistent

written by Nicola Ryan

Which patients will experience remission following infliximab treatment remains unknown. Several studies presented during DDW illustrated a consistency of benefit regardless of age, sex, weight, study centre, intestinal involvement and a host of other factors at multiple dosing levels. For example, J Onken and colleagues reported infliximab at 5 and 10 mg/kg resulted in closure of draining enterocutaneous fistulae among CD patients. Treatment benefit was observed in a broad spectrum of patients, according to subgroup analysis of gender, age, weight, study center, number of fistulae, CD Activity Index, and other factors.

Editor's note: This drug is now available in the US but when will it be available in NZ? At NZ$2-3000 per treatment don't hold your breath.

Top | back to CCSG News

 

Anti-mycrobial Approach to CD Ineffective

written by Nicola Ryan

The potent anti-mycobacterial regimen of clarithromycin plus ethambutol failed to benefit CD patients in a randomised, placebo-controlled study of 31 patients treated with these drugs, in addition to their usual therapy, for 3 months. There were no observed differences in mean Harvey-Bradshaw index, number of patients with active disease or mean lactulose-mannitol test, at 3, 6, 9 and 12 months.

The study was conducted on the rationale that CD may result from a mycobacterial infection. However, the study provided evidence that CD is not caused by mycobacteria susceptible to these medications, according to Dr Richard Goodgame of Houston, Texas, USA.

Top | back to CCSG News

 

 

Bad News for Junk Food Junkies

written by Nicola Ryan

Not only will lots of junk food make you fat, but a diet high in animal protein and processed food may be providing detrimental sulphur-loving bacteria in the gut with their favourite 'food'. They can then overcome natural healthy gut microbes, and accumulating evidence implicates sulphur bacteria in a range of human diseases, including ulcerative colitis and colon cancer.

Sulphate-reducing bacteria flourish in anaerobic environments, such as that found in the distal colon. They convert sulphate to sulphite, creating hydrogen sulphide as a waste product, a compound which is as toxic to humans as cyanide.

The Western diet is high in sulphur - which is widely used as a food additive/preservative. Sources include high protein foods, processed foods and fermented drinks (such as wine and beer).

Researchers in Cambridge, England, found that 96% of patients with ulcerative colitis hosted the sulphate-loving bacteria, compared with 50% of healthy subjects studied. One sulphur bacteria strain isolated showed signs of being adapted to life in an inflamed gut. Although these findings are significant, it is unclear whether the bacteria cause ulcerative colitis, exacerbate it, or simply like the conditions that exist in an inflamed colon. However, one of the researchers has suggested that sulphate-reducing bacteria may contribute to the persistance of ulcerative colitis, rather than causing the disease in the first place.

With respect to cancer, it has been suggested that toxic sulphides released by the bacteria could damage cellular DNA and promote cancerous changes. Interestingly, a diet high in meat has been implicated in colon cancer, but vegetable protein (particularly beans and seeds) also contain sulphur-containing amino acids. The lower incidence of colon cancer in vegetarians is therefore likely to be related to the balance of nutrients, and meat eaters who also have a lot of vegetables and carbohydrates with their meat may be at lower risk too. Carbohydrates fuel the growth of beneficial intestinal bacteria.

The English researchers suspect that other intestinal diseases such as Crohn's disease and irritable bowel syndrome may also be linked to sulphur-loving bacteria.

Vines G. New Scientist: 30, 8 Aug 1998.

Top | back to CCSG News


Pouch: J-shaped, W-shaped, S-shaped,
Ileal Pouch with Anal Anastomosis (IPAA)

Written by Stuart Ryan

Whether you've heard of it or not, this surgical procedure, which is available to people with ulcerative colitis (but not Crohn's), is the surgery of choice when disease is severe and unresponsive to drug therapy. Since 1982 203 pouches have been constructed in Auckland by Prof Hill and Misch Neill. 10% of pouches fail and are removed or "defunctioned". 70% of patients have no complications and 60% have good control of bowel motions (BMs). The median number of BMs per day is 4.0, and overnight is 0.7. Conclusion? "These figures indicate that patients have good control of pouch function and would suggest that most have a good quality of life".

(Source: Neilly, Neill & Hill. 1999 Aust. N.Z. J. Surg. 62: 22-27)

Top | back to CCSG News


Crohn's disease: holy grail still eludes researchers

Written by Stuart Ryan

In a recent article in the leading medical journal The Lancet, Dr Chris Hawkey from Nottingham University, UK, says that despite intense research on Crohn's disease, no new drugs have produced improvements that persist after withdrawal of treatment.

Specific inhibitors of the inflammatory mediators are thought to cause Crohn's disease. Researchers are currently investigating agents called anti-sense oligonucleotides that interfere with the synthesis of disease causing proteins in the hope that they will prove more effective than currently used treatments.

Other potential new drug targets include adhesion molecules, reactive oxygen species, proinflammatory and modulatory cytokines and nuclear factor-kB. This nuclear factor-kB is looking promising as it regulates the expression of several proteins that are involved in inflamation.

Top | back to CCSG News


Entocort® after Surgery

Written by Nicola Ryan.

Crohn's disease occurs most often in the ileum and the ascending colon. It is exactly these areas where 50-70% of active drug absorption from the controlled ileal release formulation of budesonide (Entocort®) takes place.

Disease recurrence is a problem after surgery, with 50% of Crohn's disease patients requiring additional surgery within 10 years. Researchers therefore decided to investigate the effects of Entocort® on disease recurrence after surgery in patients with ileocolonic Crohn's disease.

Within 2 weeks of surgery, patients were started on treatment with Entocort® 6 mg/day or an inactive placebo. They continued to take this medication for 1 year.

Benefits seen in some patients

In the patient group as a whole, Entocort® did not appear to have a significant effect on the rate of endoscopic disease recurrence ie. inflammation observed during endoscopy. However, when a subgroup of patients who had undergone surgery for severe disease activity were analysed, the endoscopic recurrence rate at 1 year was significantly lower with budesonide compared with placebo (32% vs 65%).

However, this wasn't translated to any significant benefit in terms of symptoms reported by the patient. The Crohn's Disease Activity Index, used to measure symptom frequency and severity, was similar in Entocort® and placebo recipients.

Few side effects

There was some more good news for Entocort® recipients - that was the finding that the incidence of steroid-induced side effects was no higher with Entocort® than in patients receiving the inactive placebo - further evidence that Entocort® is associated with a low rate of side effects.

More research in this area will help to more clearly define the role of Entocort® for the prevention of disease recurrence after surgery.

Heller G, et al. Gastroenterology 116, 294-300, 1999.

Top | back to CCSG News


Mesalazine: decreased risk of recurrent Crohn's disease after surgery

 

Mesalazine (Pentasa®) 3g/day effectively reduces the risk of recurrent Crohn's disease after surgical resection, according to researchers in Canada and the US.

In their study, 163 patients with Crohn's disease underwent surgical resection and then received either mesalazine 1.5 g twice daily or placebo, starting within eight weeks of surgery even if symptoms weren't present.

Long-term follow-up revealed that the calculated risk of relapse (over three years) in the respective patient groups was 26 and 45%.

It was concluded that further studies would be required to determine the potential long-term quality of life benefits of starting mesalazine routinely after surgery rather than waiting until symptoms recur, as is the current practice.

Top | back to CCSG News

Animal Models of IBD

The cause(s) of Crohn's disease and ulcerative colitis is (are) unknown. In general, however, progress in understanding intestinal inflammation has been slow because there have been no suitable animal models. The necessity of relying exclusively on patient material, obtainable only at large clinical centres, has meant that research and understanding of IBD has lagged behind that of other diseases of unknown origin such as diabetes and arthritis, where good animal models are available. This situation has now however changed with the simultaneous reports in October 1994 that in certain mouse strains a disease identical to human ulcerative colitis develops, and that in another strain, a disease with some resemblance to Crohn's disease appears.

The mice which develop these diseases are not normal mice, but mice in whom certain genes have been experimentally deleted. This technique, called gene knockout technology, has been exploited by immunologists as the best way to determine the importance of various aspects of the immune response in an intact animal. The mice which develop IBD are all mice in which some part of the immune system has been disrupted.

The most exciting part of this work however is that since the disease develops in mice, it is possible to manipulate the environment of the mice to determine what causes the gut inflammation, something impossible to do in man. This was done and the answer is clear; the stimulus for the gut inflammation is the large number of normal bacteria which inhabit the small and large intestine of all healthy individuals. If these bacteria are eliminated, the disease does not appear.

This work is conceptually extremely important. First it shows that the normal bacteria of the gut can cause chronic inflammation, so there is no need to evoke any 'infection' to explain IBD. Secondly, it shows that healthy individuals inhibit immune responses in the gut wall to bacteria, but that if the immunoregulatory inhibitory mechanisms are disrupted (as they were in the mice), then the same normal bacteria can cause disease. Of course it should be emphasised that there is no genetic abnormality in patients with IBD. Instead, it seems possible that patients with IBD are unable to control immune responses in the gut wall to the normal bacterial flora, something the rest of the population do as a matter of course. The final and most important advance however is that there are now animal models of IBD, so that research can move from the clinic to the animal house. This will encourage many more scientists to do research in this area, something which can only be of benefit.

(Reprinted from "Crohn's Research News" - CIRCA, 1994)

 

Animal Models of IBD (1996)

The causes of Crohn's disease and ulcerative colitis are unknown. However, there is evidence that development of these inflammatory bowel diseases (IBDs) involves interactions among the immune system, genetic susceptibility and the environment. Experimental models of disease allow early events and interactions between possible contributors to be studied, and immune or genetic factors to be identified.

Although anti-vivisectionists are against the 'cruelty' they believe occurs when animals are used in medical studies, most of the drugs we know today would not exist had it not been for early animal testing of potential compounds, and investigations into disease processes. IBD is no exception. In a recent review in the journal Gastroenterology, details of 17 different animal models of IBD were detailed. Each was suited to a specific aspect of IBD research, from identifying causes of disease to drug testing. Using these models allows questions to be addressed that are not possible in humans. This is probably where the breakthrough in IBD research will come from. Lets hope its soon!

 

Top | back to CCSG News


Osteoporosis Risk in IBD Patients

Osteoporosis was first described in patients with inflammatory bowel disease (IBD) a few decades ago. However, the importance of this complication and its treatment is not widely recognised.

Osteoporosis is characterised by disruption of bone structure and bone loss, and an increased risk of fracture.

Risk factors for osteoporosis include Caucasian/Asian race, being female, advanced age, small body build, premature menopause, corticosteroid therapy and intestinal disease.

Corticosteroids and bone

It is well known that corticosteroids (such as prednisone) decrease bone mass and increase the fracture rate. However, how this occurs is not clearly understood. Corticosteroids affect bone formation and breakdown. Bone breakdown is in part caused by malabsorption of calcium. Corticosteroids also have direct effects on the development of bone cellsand this is thought to influence bone formation. Reduced production of hormones by the adrenal gland, ovaries and testes while taking corticosteroid drugs may also contribute to bone loss. Bone loss is particularly rapid in the early stages of corticosteroid therapy, and, in general, higher drug dosages and longer duration of therapy appear to be associated with greater bone loss. Growth retardation often occurs in children treated with corticosteroids, and this group of patients may be particularly sensitive to the effects of corticosteroids on the skeleton.

Osteoporosis and IBD

In 1987, the prevalence of osteoporosis was estimated as 31% in patients with IBD. Studies also indicate that low bone mass is more common in patients with Crohn's disease than those with ulcerative colitis. In Crohn's sufferers, low bone mass appears to be more common in patients who have had small intestine disease and resection. However, osteoporosis has also been observed in patients with ulcerative colitis, and in the absence of any treatment with corticosteroids.

A number of factors are probably involved in the development of osteoporosis in IBD sufferers. These include corticosteroid therapy, sex hormone deficiency, calcium and vitamin D deficiency, and malnutrition. Calcium deficiency may result from calcium malabsorption or vitamin D deficiency. Since IBD sufferers are not known to be big eaters, malnutrition may also contribute to bone loss, and/or prevent the attainment of optimal bone mass in children and adolescents with IBD.

Given that IBD sufferers have a greater risk of osteoporosis attention should be focussed on early detection and prevention of bone loss. The only way to detect early osteoporosis is by using bone density measurements. This should ideally be done at or soon after the diagnosis of IBD and repeated at two-year intervals. This is especially the case for patients taking drugs that are known to increase the risk of osteoporosis.

Patients can help themselves to reduce the risk of developing osteoporosis by stopping smoking, reducing alcohol consumption and increasing their activity levels. If corticosteroids are required for treatment the minimum dosage should be selected and reviewed often. Hormone replacement therapy (HRT) has been shown to prevent bone loss in postmenopausal women with IBD, but there is a suggestion that treatment for greater than 7 years is necessary for lasting effects on bone mass. Oral contraceptives are preferable in younger premenopausal women. Unfortunately for men there is almost no work done on osteoporosis in males and as such little is known about its treatment.

Many IBD patients have a low intake of dairy foods which are the main source of calcium in the diet. Therefore calcium supplementation has a beneficial effect on bone mass in women of all ages (again nothing known for men). Taken in the diet or as supplements patients should aim for a daily intake of 1-1.5 g. If there is a vitamin D deficiency (also common in IBD patients) this should also be corrected by supplementation.

(Taken from JE Compston (1995) Aliment. Pharmacol. Ther. 9:237-250)

Top | back to CCSG News

 

Analysis of NZ Crohn's Patients who have had Surgery

Our patron Prof. Hill is undertaking an analysis of all surgery performed on Crohn's disease patients at Auckland hospital over the last 15 years. Prof. Hill is being assisted by Dr M. Rafique (MD PhD), a young gastrotinestinal surgeon, and approached the CCSG for financial assistance.

The CCSG committee is pleased to announce that it has agreed to provide initial support for the project. We are also attempting to find additional funds for this project.

From the study, Prof. Hill hopes to determine the numbers of people required surgery for Crohn's disease at Auckland Hospital over the last 15 years, their presentation, the type of surgery required and its ultimate outcome. This will be unique information and will lead to better understanding of the disease here in New Zealand, and hopefully to better treatments.

Prof. Hill and Dr Rafique plan to write an article about the research for a major medical journal, and will be keeping the group informed about the results. Watch this space . . .

Top | back to CCSG News

 

Pentasa® affects quality of life in Crohn's disease

A study performed in the USA has shown that a Pentasa® (mesalazine) dose of 4 g/day significantly improves quality of life compared with lower drug doses or placebo (an inactive "sugar pill"). In the study, 310 patients with mild to moderately active Crohn's disease received slow release mesalazine at a dose of 1, 2 or 4 g/day, or placebo, for 16 weeks. At different times during the study patients completed a quality-of-life questionnaire that asked about ability to sleep through the night, sexual relationships, performance of routine activities (e.g. work) and ability to participate in hobby and leisure activities. The results of the study showed that as the mesalazine dose increased, the quality-of-life of the patients taking the drug improved. With the 4 g/day dose, patients' responses to all the above questions significantly improved compared with placebo. Patients taking the 2 g/day dosage only reported a significantly increased ability to participate in hobby and leisure activities. The effects of the 1 g/day dose were not significantly different from those of the inactive placebo.

From a scientific paper published in Digestive Diseases and Sciences 40: 931-935, May 1995.

Top | back to CCSG News

 

Crohn's Facts and Findings

Ever wondered why ileitis is known as Crohn's Disease?

Once known as ileitis and now universally known as Crohn's disease, this form of inflammatory bowel disease was named after an American gastroenterologist, Dr Burrill Crohn whose work greatly advanced the understanding of the condition. It is reported that Dr Crohn felt that the name 'Crohn's disease' was inappropriate despite its almost universal use. He once related how he had opposed, at a conference in Prague, a resolution officially designating ileitis as Crohn's disease. But when he rose to voice his objection, he was ruled out of order and the resolution was otherwise adopted unanimously. In 1979 a letter from Dr Crohn in reply to one from the CIRCA (Crohn's in Childhood Research Association, UK) Committee said that when he was in practice he had never seen a child with Crohn's disease.

In 1983 Dr Crohn died at the great age of 99.

Stress in Childhood Crohn's Disease

Some 20 years ago Crohn's disease and ulcerative colitis in childhood were very rare and at one time thought to have been caused, at least in part, by emotional factors.

Many parents remember being asked endless questions about the emotional stability of the child, themselves, and the family as a whole. Prior to diagnosis they were often labelled "neurotic". Occasionally this still happens but over the years researchers have learnt much more about inflammatory bowel disease and thankfully most physicians and paediatricians no longer look for psychological reasons as the cause. However, stress does sometimes have an effect on patients, but this is the case with any chronic illness, and the main thing is that it is now recognised that psychological problems are the result and not the cause of inflammatory bowel disease.

Most youngsters hate the feeling of being different and often avoid telling their friends about their condition. To most people, young or old, Crohn's disease and ulcerative colitis are still very unsociable subjects and it is not easy to tell friends about bowel habits. However, this is not always in thebest approach, and it is often important for children to be able to talk openly within their family and to close friends.

When they are feeling unwell, and especially in the early days of diagnosis and tests, it is understandable that youngsters feel very unsure about their future. Given good treatment, family support and answers to their many questions most soon learn to think positively about their condition. Knowing their own limitations and what to expect helps them adjust accordingly. The aim, of course, must always be for young people to accept their condition, continue as far as possible with their normal activities and not to let their illness be the main focus of their life.

Symptoms of Crohn's Disease in Children

Incidence (%) of clinical features at diagnosis of Crohn's disease in 54 children attending St. Bartholomew's Hospital, England.

 Symptom %

  Physical signs %

 Abdominal pain 85

 Weight loss 52

 Weight loss 78

 Growth retardation 46

 Anorexia 75

  Perianal abnormality 46

 Lethargy 75

 Tender abdomen 34

 Diarrhoea 72

 Abdominal distension 32

 Delayed growth 43

 Pallor 32

 Rectal bleeding 28

 No significant abnormality 10

 Urgency 25

 Finger clubbing 8

 Tenesmus 25

 Mouth ulcers 8

 Perianal symptoms 25

 Abdominal mass 6

 Nausea/vomiting 22

 Erythema nodosum 6

 Fever 22

 Peripheral oedema 6

 Constipation 20

 Uveitis 4

 Skin rash 15

 

 Joint pains 10

 


Top | back to CCSG News

 

Smoking and IBD

An article in the NZ Herald was brought to our attention by CCSG member Jan Fiolitakis and we thought it was worth a response. For those of you that didn't see it the first paragraph was as follows...

"Doctors in Britain have discovered that nicotine patches, usually used to wean people off cigarettes, may be able to relieve symptoms of the bowel inflammation known as ulcerative colitis."

Half of the patients receiving the treatment (the equivalent of 15 to 25 cigarettes a day) reported a reduction in colitis symptoms after 6 weeks. However, they continued to take their normal colitis medication during the test and this could also have been responsible for their improved state of health.

There were some side effects of taking the patch medication. Patients who had never been smokers found the treatment difficult to tolerate and altered their dose accordingly. However, none of the patients reported craving a cigarette or feeling any withdrawal symptoms after the end of the trial.

This use of nicotine treatment for colitis is disputed. An editorial in the New England Journal of Medicine (Vol 330, No 12, 1994) suggests that there is "less than compelling proof of an anti-inflammatory effect of nicotine." The continued use of regular colitis drugs and the absence of a dose effect means the mechanism of the effect of nicotine is difficult to establish.

Conclusion: The "smoking gun" clue to the mysteries of ulcerative colitis remains well hidden.


Top | back to CCSG News

Interferon alpha in Ulcerative Colitis

First-line therapy with the immunosuppressant interferon-alpha-2a 'dramatically' improved the condition of 26/28 patients with refractory moderate or severe chronic ulcerative colitis in a Turkish study. All the patients in the study had previously failed to respond to Pentasa (mesalasine) or corticosteroids such as prednisone. In the Turkish study, the patients received subcutaneous injections of interferon-alpha-2a 3 times a week for 6-12 months.

Clinical remission was achieved within 6 months of beginning therapy in 26 of the patients. Symptoms began to improve as early as 7 days after the initiation of therapy. Not only were symptoms improved, but endoscopic examination of the colon showed that the mucosa (lining) was almost normal in appearance. The 2 patients who did not respond to interferon-alpha-2a also did not respond to subsequent treatment with other immunosuppressants. No serious or unexpected side effects were observed during the study, and no patient had a relapse in the 6-30 months after completion of interferon-alpha-2a therapy in patients with complete remission.

Although these results sound positive, other studies have not had such good results with interferon in patients with ulcerative colitis. In addition, the drug needs to be given by injection, which may not appeal to all patients. Interferon-alpha is also expensive. Nevertheless, patients who do not respond to other treatments may be treated successfully with this immunosuppressant agent.

Top | back to CCSG News

 

Pregnancy and Crohn's Disease

The incidence of Crohn's disease peaks in the second and third decades of life. Pregnancy does not appear to affect Crohn's disease, but disease activity before and during the pregnancy has been shown to directly influence the outcome of the pregnancy.

In a recent US study, 3/17 pregnant Crohn's disease patients delivered their babies prematurely (before 33 weeks' gestation); 2 of these had had no disease activity during pregnancy. Overall 7 patients had disease flare-ups during pregnancy or soon after delivery. This consisted of recurrent diarrhoea in 5 patients. Seven patients took medication during pregnancy, including prednisone, with no adverse effect on the baby.

There was concern about possible complications with a normal delivery in the patients with perianal disease. In the only patient with perianal disease who had a normal delivery, disease was unaffected. None of the other 7 patients with normal delivery developed perianal disease. Caesarean section was performed in 9 patients, 4 of whom had perianal disease. However, recurrent perianal symptoms developed in 3 of these patients after delivery. Thus, the route of delivery should be based on obstetric indications and not merely on Crohn's disease history recommend the authors of the study. Their other advice is that disease symptoms should be brought under control to minimise the risk of premature delivery and problems during pregnancy.

Top | back to CCSG News

 

Crohn's Disease on Increase

The results of a retrospective study of the incidence of paediatric IBD over an 11 year period have recently been made public. The research, undertaken at the University Hospital of Wales in Cardiff, revealed that the incidence of Crohn's disease more than doubled from 1.3 cases per 100,000 childhood population per year in the period 1983-1988, to 3.11 cases per 100,000 population per year in the period 1989-1993. In contrast, the incidence of ulcerative colitis remained the same throughout the the study period at 0.71 per 100,000 per year. Results from an English study in 1983 showed similar trends.

These findings are in direct contrast to figures published in the mid-80s on children in Scandanavia. The annual incidence of Crohn's disease was only 2.5 per 100,00 per year, but the incidence of ulcerative colitis was much greater at 4.3 per 100,000 per year. In Norway and Sweden the incidence of ulcerative colitis was greater than that of Crohn's disease. The reasons for such a variation in the incidence of Crohn's disease in some areas is unknown.

In 1993 the prevalence of Crohn's disease in the childhood population of Wales was 16.6 per 100,000 and of ulcerative colitis, 3.42 per 100,000.

Top | back to CCSG News

 

What is the role of nutrition in ulcerative colitis ?

A contribution to the current status of diet therapy in treatment of inflammatory bowel diseases

Nutritional therapy for ulcerative colitis (UC) is controversial. Studies are usually designed to investigate total parenteral (TPN) or total enteral nutrition (TEN), and before these can be compared it is necessary to differentiate between the different therapeutic aims. The aims of artificial nutritional support in patients with UC are the readjustment of the nutritional status, possible remission of disease activity, and decrease in the incidence of surgical intervention or postoperative complication.

Owing to the heterogeneity of the results published so far, it is still difficult to compare studies. Nevertheless, they indicate that the extent and severity of the colitis and the patient selection are of paramount importance in the implementation of nutritional therapy. Positive effects of TPN reported from non-controlled studies were not confirmed by controlled trials. Moreover, TPN was no more effective than an oral diet.

Regarding remission rates or operative interventions needed, TPN had more side effects than and no defined advantages over TEN. TEN seems to be useful for certain patients. In some patients with UC, it seems to be accompanied by fewer postoperative complications. However, a definitive conclusion on the effects of TEN or TPN is not yet possible.

In this context, certain fatty acids may have an important role in the treatment of UC. In prospective, randomised and controlled studies omega-3 fatty acids were found to be therapeutically useful. A reduction of the steroid doses needed is particularly important.

Another therapeutic approach in distal UC is seen in the rectal administration of short chain fatty acids.

Top | back to CCSG News

 

Fish Oil in the Treatment of Crohn's Disease

Enteric-coated capsules of fish oil appear to reduce the frequency of relapse in patients with Crohn's disease, according to a report in The New England Journal of Medicine June 13, 1996.

Researchers led by Dr. Andrea Belluzzi of the University of Bologna in Italy conducted a double-blind, placebo-controlled trial that involved 78 Crohn's disease patients who were especially prone to relapse. Subjects were assigned to take nine capsules of the fish oil or placebo daily for one year. The daily dose of n-3 fatty acids in the fish oil was 2.7 grams.

Dr. Belluzzi reported that 28% of patients in the fish-oil group versus 69% in the placebo group experienced relapses. And, after one year of therapy, 59% of patients taking the "novel" fish-oil preparation, versus 26% in the placebo group, remained in remission.

It remains speculation as to how the fish oil may actually work, although the Italian researchers have several theories which are to be tested in the future.

The enteric coating remains intact for about 30 minutes after ingestion, which spares exposure of the capsule contents to gastric acid and allows the fish oil to reach the inflamed bowel area. Some patients, Dr. Belluzzi notes, developed diarrhoea - possibly because the enteric coating did not dissolve until after it had reached the distal colon, where the fish oil seemed to have a laxative effect.

In an accompanying editorial, Dr. Humphrey J. Hodgson, of Hammersmith Hospital in London, U.K. points out that the patients in this study had low-grade inflammatory activity even though they were in remission. He thinks it's possible that the fish oil treated the inflammation rather than prevented relapse.

However, Dr. Hodgson expects that Dr. Belluzzi's report will spark a high demand for the preparation by informed Crohn's disease patients eager to find "natural" ways to treat their disease. (Note: enteric-coated fish oil is not yet available in NZ).

Top | back to CCSG News

 

Promising Results with New Crohn's Disease Treatment

 

The cause or causes of Crohn's disease are unknown. Therefore, current treatments are aimed at reducing symptoms and the underlying inflammation. However, as anyone who has taken long term prednisone therapy will know, these treatments are often associated with significant side effects.

New research has demonstrated success with taking a new approach to treating inflammation in Crohn's disease patients. One mediator that enhances inflammation in these patients is called tumour necrosis factor (TNF). The US drug company Centocor has developed an antibody to TNF that has shown promise in treating Crohn's patients who do not respond to steroids. The drug, called cA2 (CenTNFTM) is undergoing research and development for a number of diseases, including Crohn's disease and rheumatoid arthritis.

In the latest study results, presented at a big conference in the USA recently, cA2 was shown to decrease symptoms and disease activity, maintain remission, and to help heal fistulae in patients with Crohn's disease. The last result is even more significant in light of the fact that there is currently no treatment effective against fistulae, a painful complication of Crohn's disease. The promising results were observed after infusion of just a single drug dose (because cA2 is an antibody it must be given by intravenous (IV) infusion).

Centocor plans to start another trial in the next few months to investigate the optimal dose and duration of cA2 therapy in patients with Crohn's disease. They are also in the process of gathering information to present to various worldwide health authorities in support of a commercial licensing application.

However, even if cA2 continues to be successful in clinical trials, it may be a while before the treatment is widely available, particularly in NZ. Agents such as cA2 are usually very expensive.

Refs: Klumpe, DE. Centocor Inc., personal communication; BioWorld Today 8: 1&5, 13 May 1997; Gastroenterology 109: 129-135, No. 1, 1995.

Top | back to CCSG News

 

Nicotine Patches in UC

The media is full of stories about the health hazards associated with smoking. However, a recent study by researchers in the US indicates that patients with mild to moderate active colitis may benefit from nicotine - one of the components of cigarettes.

In the study, patients stuck patches containing nicotine on their skin for a month. They also continued to take their normal anti-inflammatory medication (including drugs like Pentasa and prednisone).

At the end of the study, the number of patients who had improved symptoms and decreased disease activity was greater among those who had applied the nicotine patches compared with those who used 'fake' placebo patches. However, the news was not all good. Just over three quarters of patients who used the nicotine patches reported side effects including skin problems, feeling sick and dizziness. These side effects were severe enough to cause 5 patients to withdraw from the study.

The beneficial effects of nicotine patches observed in this study concur with the observation that the rate of ulcerative colitis is lower in smokers. However, smokers have a higher rate of Crohn's disease. In addition, the slight beneficial effects of nicotine certainly do not outweigh the many health risks associated with cigarette smoking.

Refs: Annals of Internal Medicine 126: 364-371, 1 Mar 1997; Sunday Star-Times 2/3/97.

Top | back to CCSG News

Short-Chain Fatty Acids in UC


'There is a case for short chain fatty acid (SCFA) enemas' in the treatment of patients with ulcerative colitis, according to Dr John Cummings from Addenbrookes Hospital in the UK.

SCFAs are normally present in the distal colonic mucosa, and it has been suggested that defective metabolism of one of the SCFAs (butyrate) may be involved in the development of colitis.

Dr Cummings reviewed 9 studies looking at the use of SCFA enemas in patients with ulcerative colitis. One of them showed that SCFAs may play a role in protecting against colon cancer in colitis patients. However, in the same study, inflammation parameters were not affected by the SCFA treatment.

In general, analysis of the studies showed that twice-daily use of the SCFA enemas was more beneficial that once-daily treatment, and that a treatment period of 6 weeks was appropriate.

Dr Cummings commented that although the benefit of SCFA enemas in the first-line treatment of ulcerative colitis is undetermined, they would be cheap to make and free from adverse effects.

Reference: Cummings, JH. European Journal of Gastroenterology and Hepatology 9: 149-153, Feb, 1997.

Top | back to CCSG News

 

Cost of Maintaining Remission in Crohn's Disease


Some patients with Crohn's disease are lucky enough to go into remission, which means their disease is no longer active. Obviously this is something worth achieving and maintaining. A number of drugs have been shown to increase the chances of a patient going into remission, but doctors still don't agree on whether long term drug treatment should be used to prevent recurrence of disease in Crohn's disease patients who are already in remission. Drugs containing 5-aminosalicylic acid (5-ASA) such as Pentasa® and Asacol® have been shown to be effective for these patients, and are considered to be the only real alternative to no treatment. A recently published study has investigated the costs and benefits of using the 5-ASA drug mesalasine to maintain remission in patients with Crohn's disease.

Firstly the authors presented data from a previous study that showed the costs associated with Crohn's disease. For example, the cost per month of a relapse not requiring hospitalisation was $US1,150 (approx. $NZ1,770), and if the relapse required hospitalisation, or hospitalisation with surgery the associated costs per month were $US13,000 (approx. $NZ20,000) and $US43,000 (approx. $NZ66,150), respectively. The monthly cost of maintenance therapy with mesalasine was $US91 (approx. $NZ140).

As well as looking at costs, the authors assessed quality of life variables, and adjusted their resulted accordingly.

After all the variables had been examined, the results showed that both the costs and quality parameters were similar in patients treated with mesalasine and in those receiving no active treatment. Overall, the cost of mesalasine therapy was $US5,000 (approx. $NZ7,692) for each year of life gained (adjusted for quality variables).

The authors of the study therefore concluded that 'chronic maintenance therapy with mesalasine in patients with inactive Crohn's disease should not be discouraged on the basis of preliminary cost-utility considerations'. However, they added that more studies are needed to look at the long term use of mesalasine for Crohn's patients in remission.

Reference: PharmacoEconomics 11: 444-453, May 1997.


Top | back to CCSG News

 

Measles and Crohn's - Fact & Fiction

Recent media reports have highlighted a study that suggests there is a link between the combined measles-mumps-rubella (MMR) vaccine and the incidence of the inflammatory bowel disease (IBD) Crohn's disease. A more detailed examination of the most recent scientific evidence does not support this view.

Background on Crohn's Disease

Crohn's disease is a condition involving the swelling, thickening and inflammation of one or more parts of the gastrointestinal tract. Symptoms most commonly include abdominal pain, fever, loss of appetite (anorexia) and weight loss. It is a chronic condition which, depending on the severity, requires treatment with drugs and possibly surgery.

The cause of Crohn's disease remains a mystery and as a result many theories have been suggested. Current 'favourites' include infection by Mycobacterium paratuberculosis, the bacteria which causes intestinal tuberculosis and paratuberculosis. Another involves the possibility that IBD occurs when bacteria in the intestine cause an abnormal immune response in people who have genes which make them susceptible to Crohn's disease or ulcerative colitis. This implies of course that there are certain genes that make people susceptible to IBD, and the search for these is also ongoing (see below). It is these theories that most scientists in the field believe will result in a greater understanding of IBDs and the development of new treatments for Crohn's disease and ulcerative colitis.

Is There a Link with MMR Vaccination?

The suggestion of a link between the MMR vaccine and Crohn's disease first surfaced in about 1995. That study was criticised for having serious problems with how the work was carried out. At the time, the British government commissioned an independent review which found no evidence to support the link.

The recent publicity for this link arose from media releases about incomplete trials, rather than completed scientific studies, and has been played down by New Zealand medical officials. "The information was incomplete and unsupported by scientific data" said Dr Mel Brieseman, Canterbury's medical officer of health in the Christchurch Press (31/7/97).

Data collected in New Zealand over the last 10 years by the Ministry of Health show a stable number of new cases of Crohn's disease despite a rise in the use of the MMR vaccine. As a result, Director of the Public Health Group in NZ, Gillian Durham, has defended the Ministry's promotion of the use of this vaccine. In addition, the most recent study published on this topic, in the British medical journal, the Lancet, (13 Sept., 1997: 350, 764-766) shows no evidence for a link between the MMR vaccine and Crohn's disease.

The New Zealand Herald ran a front page story about the first media releases proposing a link between MMR vaccination and Crohn's disease (and autism - a completely unrelated condition). They also published follow-up articles later in the week. However, a further article about a study refuting the original claims was only briefly reported and was buried within a section of the newspaper, and certainly did not receive same the media 'hype''.

An in depth article in the New Zealand Listener (August 23, 1997) gave plenty of fuel to the 'Immunisation Awareness' group's opposition to the national vaccination programme. The problem with this sort of selective reporting is that it exaggerates the situation, raising concerns among people who have Crohn's disease, as well as parents who are considering vaccinating their children.

At the end of the day, this publicity has focussed attention on the negative aspects of immunisation as well as raised unjustified fears in people with Crohn's disease. While the theory of a link with the measles vaccine has not been established at this stage future work should provide an answer one way or the other. We will be monitoring future developments in this area and as always will pass any new information on via the CCSG News.

Top | back to CCSG News

 

Balsalazide in Ulcerative Colitis

written by Nicola Ryan.

Balsalazide is a promising new drug for patients with ulcerative colitis. It is 'related' to available agents such as mesalazine (Pentasa®), because it releases 5-aminosalicylic acid (5-ASA). For balsalazide, this release occurs in the colon in response to specific colonic bacteria. Another potential 'plus' for balsalazide, is that animal studies have indicated that it may help prevent colon cancer.

In a British study, balsalazide was more effective than mesalazine for inducing remission in newly diagnosed patients with ulcerative colitis.

In another study, this time performed in the USA, balsalazide recipients showed a greater decrease in symptoms than those treated with mesalazine. The patients in this study had had colitis for longer than those in the first study.

Other trials have shown balsalazide to be more effective and have fewer side effects than sulfasalazine (Salazopyrin®), another 5-ASA drug.

The good news for UK patients with colitis is that balsalazide was recently launched there as Colazide® by licensee company Astra. Balsalazide was developed by a company called Biorex, who have licensed the drug rights to a number of different companies worldwide. US licensee company Salix is also seeking approval for balsalazide in the USA.

Scrip 2273: 19, 7 Oct 1997; Adis R&D Insight CD-ROM, Sep 1997; Canada Newswire [online]: 16 May 1997, available from http:\\www.newspage.com

Top | back to CCSG News

 

Australian IBD gene register

Genetic research into the cause of Crohn's disease and ulcerative colitis has identified several candidate genes that people with an IBD are more likely to have. One of these genes (called IBD-1) is being studied in depth by a group working at Canberra Hospital in Australia.

The CCSG Inc has been invited to contribute to this research by asking for volunteers for inclusion on the Australian IBD Family Register. They are particularly interested in families where two or more members have an IBD, and also in twins in which one or both have an IBD. If you fit the bill and would like to be placed on the Register please contact the CCSG.

This is your chance to be part of the cure!

Top | back to CCSG News

Entocort® is a cost-effective choice for maintaining remission in Crohn's Disease

Written by Nicola Ryan

As mentioned in previous newsletters, Entocort® is a new drug for the treatment of Crohn's disease. Entocort® is a steroid like prednisone, but 50% fewer people taking Entocort® experience side effects compared with prednisone.

In addition to being very effective for treating flare-ups of Crohn's disease, Entocort® may also be useful for helping to maintain remission.

A recently published European study (1) investigated whether using Entocort® to maintain remission was a cost-effective option in a theoretical group of patients with Crohn's disease who were in remission after a disease flare-up 10-12 weeks previously. They found that it cost approximately NZ$21.50 for each additional day in remission associated with Entocort® use. Because Entocort® increases the time in remission compared with no treatment, it decreases healthcare costs overall as the cost of the drug is lower than the cost of managing flare-ups of Crohn's disease (including gastroenterologist fees, hospital stays and possible surgery).

1. Noble I, et al. Clinical Drug Investigation 15: 123-136, Feb 1998.

Don't forget that Entocort® is now available in New Zealand - So, if you have a prescription for Entocort®, or are thinking of requesting it from your doctor because you can't tolerate prednisone, be sure to contact the CCSG for information about the CCSG Entocort® programme and ask for details about how you might be able to save yourself some money and get Entocort® at the lowest price possible.


Top | back to CCSG News

 

Yamanouchi IBD Symposium (1998)

Written by Nicola Ryan

The IBD Symposium was organised and sponsored by long-time CCSG supporters Pharmaco (the NZ agents for Yamanouchi, who produce Pentasa), and is held every second year. This time around, CCSG president and secretary Stuart and Nicola Ryan were lucky enough to be invited to the Auckland event.

As well as CCSG patron Professor Graham Hill, other speakers at the symposium included gastroenterologist Dr Mark Lane, IBD researcher Dr Vint Chadwick from Wellington, and IBD expert from London, Dr Michael Kamm.

The first topic of the day was 'An Update on the Aetiology of IBD', by Dr Chadwick. We were told that research into what causes IBD is becoming easier because of the development of good animal models to use in research. After recent animal and human research was discussed, the conclusion was that to develop IBD you must have some sort of genetic 'defect' or predisposition. If you have a 'defect' then the potential for immune dysregulation is there, and this requires some sort of 'kick-start' - which is usually an event in the first months of life, and probably some sort of infection.

Next, Dr Kamm spoke about 'Recent Advances in the Medical Management of IBD'. One of the most discussed drugs in this section was azathioprine, which was spoken of quite highly by the doctors at the symposium. Azathioprine (Imuran®) is an immunosuppressant agent which takes 3-6 months to achieve full therapeutic effect. Dr Kamm reported that all well-conducted studies had shown a positive effect of azathioprine in both ulcerative colitis and Crohn's disease. With respect to Entocort® (budesonide), Dr Kamm called this a 'helpful addition' to the choice of drugs for Crohn's disease, particularly for young patients with disease in the terminal ileum. In terms of new therapies, 2 companies are developing anti-TNF antibodies (one of these, cA2 - now known as infliximab - has been featured in the Research News section of previous issues of the CCSG News). Studies with infliximab and similar agent CDP 571 have been encouraging. 67% of patients with treatment-resistant Crohn's disease have been shown to respond to infliximab. However, these agents are very new and, because of the technology involved in their development and production, are likely to be very expensive - so don't expect to see them in New Zealand soon!

Professor Hill presented the next section on the 'Surgical Management of IBD'. The 'pouch' operation for colitis was discussed, and we learnt that most patients in NZ receive a J-pouch. With respect to Crohn's disease, Prof. Hill said that > 50% of patients will need at least 1 operation, for medical failure, obstruction with pain, or sepsis.

After some questions and case presentations, the afternoon ended with a lovely dinner at the Sheraton, Auckland.

The CCSG is grateful to Pharmaco both for the invitation to the symposium and their ongoing support of the group.

Top | back to CCSG News

 

Cyclosporin - An Alternative to Surgery in Severe Colitis

Written by Nicola Ryan

A patient presenting with a severe attack of ulcerative colitis is usually hospitalised, and treated with fluids, electrolytes and high dosages of IV corticosteroids. The remission rate with this approach is about 70%. Another 15-20% of patients have a partial response to treatment, and total colectomy has been the only option in the remaining 10-15%.

Over recent years immunosuppression with intravenous cyclosporin has been used as an alternative to surgery with varied, but notable, success, particularly in the short term.

Clinical experience with IV cyclosporin in Belgium showed that 69% of patients avoided colectomy after treatment for 4-41 (median 10) days. After a follow-up of 12 months, the proportion of patients who had still not undergone colectomy was 45%. Only 25% of patients who received maintenance therapy with azathioprine required colectomy compared with 50% of those who did not receive azathioprine [Acta Gastroenterologica Belgica 60: 197-200, Jul-Sep, 1997].

The short term remission rate was 56% in patients treated with IV cyclosporin for 1-10 (mean 4.5) days in a UK hospital. Patients who achieved remission during this treatment went on to receive oral cyclosporin for 3-6 months, with a long term remission rate of 40%. Response to cyclosporin was not related to the extent of disease or patient age [European Journal of Gastroenterology and Hepatology 10: 411-413, May 1998].

When cyclosporin was initiated as oral therapy in patients with severe refractory ulcerative colitis or Crohn's disease, there were groups of patients that appeared to benefit more than others. Treatment was not effective in those with small intestinal Crohn's disease, or in those with azathioprine-resistant IBD at baseline [Australian and New Zealand Journal of Medicine 28: 179-183, Apr 1998].

It could be said that using cyclosporin in severe refractory ulcerative colitis is merely delaying the inevitable. The long term outcome for many patients will still be proctocolectomy. However, if patients have experienced a period of relative good health they may be in a better position to tolerate surgery than if they had been operated on previously. The issue of trying to maintain remission for as long as possible and the best way of achieving this is also important. In one of the studies reported above, patients receiving azathioprine were less likely to undergo colectomy than those who didn't. This requires planning ahead as azathioprine takes many weeks to reach full therapeutic effect.

Oral cyclosporin is obviously another alternative for patients who cannon maintain remission on corticosteroids and/or salicylates (such as Pentasa®). However, there are obvious issues with the side effects of long term immunosuppression. In addition, cost considerations are important in some countries. For example, the cost of oral cyclosporin in New York, USA is $US25 per day.

Although there are many factors to take into account when deciding to use cyclosporin in IBD, the success rates achieved in patients who are refractory to all other medical treatment, and would otherwise be looking at certain surgery, are not insignificant. From a patient point of view, many would prefer medical therapy to surgery, even though there are now surgical options other than colostomy and ileostomy (the 'pouch' operation. Cyclosporin will therefore continue to be used and studied in this clinical setting.

Top | back to CCSG News


Alternative Therapies used by CCSG Members

(First report from a survey of CCSG members)

130 CCSG members completed and sent back the questionnaire which was included with a previous issue of the CCSG News - thankyou for sharing your personal experiences. The information will help respond to queries. In this issue (and the next few) we will be examining your answers more fully. Below is a report about alternative therapies that members have tried (and their results!).

Many members have tried an alternative therapy

38% of members reported trying alternative treatments (ATs)with a further 5% explicitly indicating their interest. It was common for members to have tried more than 1 AT.

Dietary Factors

3% of members reported using fibre supplements such as psyllium and metamucil. The use of oats and millet was also reported. 19% explicityly reported adjusting their diet in some way, and it was not uncommon for this to be part of naturopathic treatment. There is probably a higher incidence of dietary modification than this, much of it not being considered as part of treatment, or specifically reported. Some form of dietary adjustment was found to be useful by 72% of members. The top 10 foods eliminated were: dairy products, wheat, sugar, yeast products, alcohol, high fat foods, spicy foods, tomatoes, cabbage/cauliflower, and some fruits.

Supplements

These were taken by 21% of members, often with a herbal product as well. This makes it hard to comment on the effectiveness of supplements alone, however 63% of members trying supplements as part of their treatment found them helpful. The 10 most helpful supplements were: acidophilus (supplement or yoghurt), fish oil, evening primrose oil, folic acid, zinc, magnesium, B vitamins, vitamin C, multivitamin tablets, and food digestion pills.

Herbs

31% reported taking herbal preparations, including those specifically mentioning herbs as part of other treatments such as naturopathy. 65% of members taking herbal preparations found them helpful. Helpful herbal preparations included slippery elm, spirulina, chorella, aloe vera, St John's wort and echinacea.

Naturopathy and Homeopathy

Homeopathy and Naturopathy were tried by10% and 5% of members, respectively. The number of members finding these 'helpful' was was 77% for homeopathy and 33% for naturapathy. Looking at the results in the Supplements and Herbs sections, it looks like members are inclined to get advice on these from someone other than a homeopath or naturopath, with reasonably good success.

Acupuncture, meditation and exercise

6% of members had tried acupuncture, with 25% of these having some benefit. 2.3% had tried meditation techniques and all reported being able to reduce their medication doses. Exercise was helpful in 1.5%.

Other alternative treatments

8% of members reported trying other treatments. The most helpful of these included Tibetan medicine, osteopathy, reflexology, reiki, crystal healing, and experiencing a period of remission after child birth.

Degree of benefit from treatments

Of the treatments that helped, most reproted a reduction in symptoms. A smaller number (about 15%) reported a reduction in medication dosages, and only a few cases of total remission were documented (<3%).

Top | back to CCSG News




© Crohn's and Colitis Support Group Inc, Ph: 0508 227-469 or (09) 636-7228 Fax: (09) 636-7242 Email: ccsg@clear.net.nz