Flexible Endoscopy Biopsies for Submucous Tumors With a New Drill Instrument

Study Overview
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Brief Summary
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The purpose of this study is to determine whether the newly constructed CE (Conformité Européenne) marked drill biopsy instrument for flexible endoscopes can make possible representative biopsies of the increasing numbers of submucosal tumours in the gastrointestinal tract. The amount of submucous tissue ( micrograms and in % of all the biopsy) harvested with the new drill biopsy instrument used in flexible endoscopy investigations is measured in the study and compared to the amount of submucous tissue harvested with the existing biopsy forceps.

Detailed Description
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Background: With the existing biopsy instruments for flexible endoscopy it's only possible to achieve superficial biopsies comprising the mucosa and very seldom some small fragments of the submucosa. It is, however, increasingly important to get biopsies from the submucous tissues because the tumors that are on the increase more than any other in the stomach is the GIST (GastroIntestinal Stroma Tumours) that grows in the submucosa. Cytology is not enough for a reliable diagnosis and to often not representative. Furthermore there is a well-known risk for tract seeding when sampling through the abdominal wall with a fine needle instrument. The investigators have invented a new biopsy instrument for flexible endoscopy that is a drill within a cylinder that can be used for biopsies of the submucous tissues, for instance GIST-tumours, see www.BIBBInstruments.com. Hypothesis: Will it be possible to achieve representative submucous tissue from the gastrointestinal tract with the newly constructed drill biopsy instrument for flexible endoscopy. The investigators hypothesize that the amount of tissue harvested with the new drill biopsy instrument will give significantly more amount of tissue to evaluate for the pathologist than the existing biopsy forceps. Method: Ten patients with tumours in the submucosa of the stomach are examined with a gastroscope. The investigator decides where the first biopsy should be taken and randomly the investigator blindly get the new drill instrument or the conventional biopsy forceps and take the biopsy on the decided localization. The next site of the tumour is decided and again blindly the investigator get one of the two biopsy instruments according to a previously decided scheme. Six biopsies (three with each of the two biopsy tools) in every patient are harvested in ten patients. With altogether 30 specimen for each biopsy instrument and a difference of 1/3 which is a low calculated difference 10 patients as above will give a 80 % Power (Chi-2 = 5.40, p = 0.02*). The amount of submucous tissue harvested with the two biopsy instruments are measured in microgram and as percentage of all the biopsy and compared. The quality of the specimens are also calculated.

Official Title
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Flexible Endoscopy Biopsies With the New Drill Biopsy Instrument for Submucous Tumors

Conditions
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Gastric Tumor

Intervention / Treatment
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* Device: Flexible drill biopsy instrument
* Device: conventional biopsy instrument


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Submucous gastrointestinal tumours Exclusion Criteria: No gastrointestinal submucous tumor Submucosal hemangioma
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: New drill biopsy instrument<br>To take biopsies from gastric submucosal tumors with a new drill biopsy instrument used with flexible endoscopes. | Device: Flexible drill biopsy instrument<br>* Biopsies taken with the new drill biopsy instrument for flexible endoscopy<br>* Other names: Endodrill (=Internal code name);|
| Active Comparator: Conventional biopsy instrument<br>To take biopsies from gastric submucosal tumors with conventional biopsy forceps used with flexible endoscopes | Device: conventional biopsy instrument<br>* Biopsies taken with conventional biopsy forceps for flexible endoscopic instruments<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Amount of submucous tissue in gastrointestinal submucosal tumors harvested with a new drill biopsy instrument used with flexible endoscopes. | Amount of submucous tissue adequate for histological examination harvested with the new drill biopsy instrument for flexible endoscopy and compared to the amount harvested with the existing biopsy forceps in a randomized setting. | Within 30 days for each patient | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Gastric tumor