Biohit Oyj

Environmental & Social Information • Mar 10, 2015

GastroPanel® and Acetium® inventions: The GastroPanel® blood examination reveals, e.g., atrophic gastritis (anacidic stomach) with related risks, such as risk of stomach and oesophageal cancer. Acetium® capsules, that bind the carcinogenic acetaldehyde in stomach, may decrease i.e. the risk of these serious cancers.

The GastroPanel® and Acetium® innovations are together a unique combination that can help to prevent gastric and oesophageal cancers. GastroPanel® detects atrophic gastritis and the related gastric and oesophageal cancer risks while the conditions are still treatable. Atrophic gastritis of the corpus, which is usually irreversible, leads to permanent achlorhydria. In an achlorhydric stomach (also caused by a long term PPI-treatment), microbes from the mouth can survive and produce acetaldehyde from sugars and alcohol present in food. In the new cancer classification issued by WHO in October 2009, acetaldehyde present in alcoholic beverages and formed from ethanol endogenously is in Group 1, together with carcinogens such as asbestos, tobacco and benzene. Globally, acetaldehyde exposure mediated by gastrointestinal tract microbes or tobacco smoke is associated with approximately four million new cases of cancer each year, nearly 40 per cent of all cancers. These include upper aerodigestive tract, colon and pulmonary cancers. Biohit has developed Acetium® products and a method to reduce physical and nutritional exposure to acetaldehyde (www.biohithealthcare.com/scientific/study-protocols).

The state-of-the-art, safe and economic GastroPanel® examination for the diagnosis of Helicobacter pylori (H.pylori) infection and atrophic gastritis with all its sequels does not have any of the following serious medical problems:

The ¹³C urea breath test (UBT), stool antigen test and antibody tests for H. pylori infection do not detect atrophic gastritis which is caused by H. pylori infection or an autoimmune disease. The early and reliable diagnosis of atrophic gastritis is important and often life-saving because of its several risks, including, e.g., unnecessary deaths due to stomach and oesophageal cancer.

In addition to the risks of gastric and oesophageal cancer, atrophic gastritis may cause malabsorption of vitamin B12, iron, magnesium, calcium and some drugs. Calcium deficiency causes osteoporosis, and vitamin B12 deficiency can cause Alzheimer's disease, dementia, depression and polyneuropathy, as well as high homocysteine content in the body, which in turn is thought to be an independent risk factor for atherosclerosis, heart attacks and strokes. The absorption of dipyridamole, some iron products and antifungals (fluconazole, itraconazole), thyroxine and atazanavir is considerably impaired in an anacidic stomach.

Atrophic gastritis in the gastric corpus and PPI therapy cause anacidity (aclorhydria) of the stomach. The risk of pneumonias and, in senior citizens, even the risk of fatal intestinal infections (such as giardiasis, malaria, Clostridium difficile and E. coli EHEC) may increase significantly in an anacidic stomach.

H. pylori gastritis may also develop into antral atrophic gastritis, which increases the risk of peptic ulcer disease and gastric cancer. If both antrum and corpus mucosa are atrophic, this condition is the highest risk for gastric cancer known to date.

Furthermore, none of the aforementioned three H. pylori tests (¹³C urea breath test, stool antigen test and antibody test) provides any information on excessive gastric acid secretion (high acid output), which is diagnosed by GastroPanel, and which in patients with gastro-oesophageal reflux disease may cause complications of this disease in esophagus. Such complications are often asymptomatic and include

ulcerative oesophagitis and Barrett's oesophagus, which may lead to oesophageal cancer if left untreated. In addition, the 13C urea breath test and stool antigen test may give up to 50 % false negative results if the patient has a) atrophic gastritis b) MALT lymphoma or c) bleeding peptic ulcer disease or d) if the patient is currently receiving antibiotics or PPIs.

Diagnosis of upper abdominal complaints (dyspepsia) and H. pylori infection is still biased by the above described medical problems that may lead to delayed diagnosis and disease progression beyond curative treatment.

Before the entry of GastroPanel test in the market for more than ten years ago, atrophic gastritis and Helicobacter pylori infection , were found by chance during endoscopy (gastroscopy). Thus, acid-free stomach (AG of the corpus) which is usually asymptomatic has remained undetected in many people. These undetected lesions might have progressed to gastric or oesophageal cancer (possible in several hundred subjects every year) or resulted in B-12 vitamin deficiency with all associated sequels that are no longer curable. There are only estimates of the number of such events during the past ten years, when most of the people with dyspepsia (20-40% of the population) or H. pylori infection (20 to 70% of the population, pending on age) have been examined only with the ¹³C-urea breath test (UBT). Even today, most doctors, not to mention the patients with dyspeptic disorders, are not being adequately aware of the fact that the UBT and the stool HP-antigen test may give false negative results, and about the fact that these tests will not detect atrophic gastritis and the risks associated with ite.g. the risk of gastric cancer.

The GastroPanel® examination arguments for general practitioners – for huge unmet need (indications)

• GastroPanel® should be the first-line diagnostic test for the diagnosis of H. pylori infection (5-80% of the world population) and in examination of all patients with dyspepsia (20-40% of the western population).
• GastroPanel® should be used to rule out or confirm the high acid output of reflux patients instead of the trial and error use of PPIs. The long term use of PPIs may increase the risk of stomach and oesophageal cancer.
• GastroPanel® markers Pepsinogen I, PGI, Pepsinogen II, PGII, Gastrin-17, G-17 and H.pylori antibodies reveal:
• o Subjects at increased risk for stomach- and oesophageal cancer, i.e. those with atrophic gastritis as well as those with a low risk of cancer; H.pylori infection with no atrophic gastritis in the antrum or corpus.
• o Early and reliable diagnosis of H.pylori infection and atrophic gastritis (AG) save costs and prevent many unnecessary diseases and deaths due to stomach and oesophageal cancer.
• GastroPanel® is also indicated for special target patients, especially patients with autoimmune diseases (usually more than one at the same time), including, e.g.:
• o patients with autoimmune thyroiditis who may have autoimmune atrophic gastritis (AAG, 18% of thyroiditis patients) in the corpus with related risks,
• o patients with type 1 diabetes who may have AAG and, e.g., also deficiency of B-12 vitamin (12% of diabetes patients) with related risks,

• o patients with celiac disease who may have AAG with related risks, and

• o patients with rheumatoid arthritis who may have AAG with related risks.

• In patients with AG or AAG, absorption of vitamin B12 is reduced.
• o Due to vitamin B12 deficiency, there is an increased risk of depression, Alzheimer's disease, dementia and polyneuropathy. Consequently, all patients with depression, Alzheimer's disease, dementia and polyneuropathy should be examined by GastroPanel® to rule out or confirm those with AG or AAG in the corpus.
• o Due to vitamin B12 deficiency, increased homocysteine levels in the body may be related to:
  • Atherosclerosis these patients should be examined by GastroPanel® to rule out or confirm AG or AAG with related risks
  • Heart attacks these patients should be examined by GastroPanel® to rule out or confirm AG or AAG with related risks
  • Strokes these patients should be examined by Gastro Panel® to rule out or confirm AG or AAG with related risks.
• Furthermore, in patients with AG or AAG of the corpus, absorption of Ca, Fe, Mg and Zn is reduced. Low Ca is associated with osteoporosis, while low serum Fe results in anemia.
• All patients with osteoporosis (or otherwise prone to bone fractures) and anemia patients should be examined by GastroPanel® to rule out or confirm AG or AAG.
• The risk of pneumonia and in senior citizens also the risk of fatal intestinal infections (such as giardiasis, malaria, Clostridium difficile and E. coli EHEC) may increase significantly due to an anacidic stomach caused by AG, AAG or PPI's. All patients with such infections should be examined by GastroPanel® for detection of AG and AAG.
• All subjects diagnosed with AG and AAG in GastroPanel® need gastroscopy in order to confirm diagnosis and treatment.

Please note that the urea breath test (UBT), stool antigen test or H.pylori antibody test alone do not reveal AG or AAG. Furthermore, UBT and stool antigen test give 50% of false negative results in H. pylori patients, particularly if the patient has AG due to H. pylori infection or AAG, bleeding peptic ulcer, chronic use of PPIs, antibiotic treatment or MALT lymphoma due to H. pylori infection. GastroPanel® is also suitable for screening of healthy (asymptomatic) people, because H. pylori infection, AG or AAG with related risks are often asymptomatic.

Biohit emphasizes that the GastroPanel blood test is not a test for stomach cancer, but instead a test that detects the subjects at risk for gastric cancer. GastroPanel test finds with high precision, asymptomatic and H. pylori infection and gastric mucosal atrophy (atrophic gastritis), at an early stage when still amenable to curative treatment.

In 2012, group of 16 of the leading gastroenterologist from 12 different countries released a joint statement that the atrophic gastritis screening and detection by GastroPanel is a clearly justified (1). The same conclusion was reached by the widespread Maastrich IV recommendation, according to which the biomarker tests are recommended as part of the diagnosis and management strategy of Helicobacter pylori infection and atrophic gastritis (2).

In addition, a recent international conference held in Kyoto published recommendations that the use biomarkers included in GastroPanel is a very suitable method to replace the often unnecessary endoscopies for the diagnosis and screening of stomach diseases (3). Furthermore in 2012, 63 experts from 24 countries

found that gastric mucosal atrophy (atrophic gastritis) may result in, among other things, gastric cancer, and therefore should be monitored at regular intervals (4). Finding atrophic gastritis requires gastric endoscopy and regular monitoring. Early detection and treatment of stomach cancer significantly improves the patient's prognosis. In current practice, gastric cancers are almost always diagnosed too late, because the current practice used in the diagnosis of Helicobacter pylori infection (¹³C-urea breath test and stool antigen test) do not reliably find Helicobacter pylori infection.

GastroPanel blood test has been shown to be highly cost-effective. According to cost-efficiency model developed by Nordic Healthcare Group, organized GastroPanel screening of one single age group (50-yearold) for the risk of gastric cancer potentially saves more than EUR 60 million in the national healthcare costs in Finland. Worldwide, already millions of people have been tested with this test.

References:

1) Agréus L, Kuipers EJ, Kupcinskas L, Malfertheiner P, Di Mario F, Leja M, Mahachai V, Yaron N, van Oijen M, Perez Perez G, Rugge M, Ronkainen J, Salaspuro M, Sipponen P, Sugano K and Sung J: Rationale in diagnosis and screening of atrophic gastritis with stomach-specific plasma biomarkers. Scand J Gastroenterol 47: 136-147, 2012.

2) Malfertheiner P, Megraud F, O'Morain CA, Atherton J, Axon AT, Bazzoli F, Gensini GF, Gisbert JP, Graham DY, Rokkas T, El-Omar EM and Kuipers EJ: European Helicobacter Study Group. Management of Helicobacter pylori infection--the Maastricht IV/ Florence Consensus Report. Gut 61: 646-664, 2012.

3) Sato K et al. 2014 Serological tests (Pepsinogen I and II and anti-H.pylori antibody) are useful for selecting subjects at high risk for gastric cancer. The Kyoto Global Consensus Meeting on H. pylori Gastritis. Time for a change. January 30th – February 1st, 2014. Kyoto, Japan. (sent for publication)

4) Dinis-Ribeiro M et al. 2012 Management of precancerous conditions and lesions in the stomach (MAPS): guideline from the European Society of Gastrointestinal Endoscopy (ESGE), European Helicobacter Study Group (EHSG), European Society of Pathology (ESP), and the Sociedade Portuguesa de Endoscopia Digestiva (SPED). Endoscopy 2012;44: 74-94.