Erythromycin Treatment for Readthrough of APC Gene Stop Codon Mutation in Familial Adenomatous Polyposis-minors' Adjusted Version
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|ClinicalTrials.gov Identifier: NCT02354560|
Recruitment Status : Unknown
Verified January 2015 by michal roll, Tel-Aviv Sourasky Medical Center.
Recruitment status was: Not yet recruiting
First Posted : February 3, 2015
Last Update Posted : February 3, 2015
Colorectal cancer (CRC) is a leading cause for cancer related mortality in the western world with a lifetime risk of 6%. Etiology is complex, while genetic background significantly affects the risk. Around one third of all genetic disorders as well as most cases of Familial Adenomatous Polyposis (FAP) and a large proportion of all sporadic CRC cases occur as a result of premature nonsense mutations (creating a stop codon) in an individual's adenomatous polyposis coli (APC) gene. Nonsense mutations are single-point alterations in the DNA that prematurely halt the protein translation process, producing a shortened, nonfunctional protein. In many of these cases, if the cell can be 'persuaded' to ignore the premature stop codon signal, the resulting protein may be able to ameliorate or stop the disease.
Recently, members of the aminoglycoside family of antibiotics have been found to induce ribosomal read-through of nonsense mutations, leading to expression of a full length, functional protein. Investigators have recently shown that members of the aminoglycoside and macrolide antibiotic families can induce read-through of the nonsense mutations in the APC gene and lead to reduced oncogenic phenotypes in CRC cells and in different mice models.
The aim of this project is to determine the ability of the macrolide antibiotic-erythromycin to induce read-through of the nonsense mutations in the APC gene and to induce expression of a full length, functional APC protein in patients suffering from FAP and to tests its effect on adenoma number and size and on desmoid tumors in these patients. The future goal is to maximize the effect of stop-codon suppressors on APC while minimizing side effects.
In this study investigators will select FAP patients which carry APC nonsense mutations, treat them with erythromycin PO for 4-6 months and examine colonic and duodenal adenomas as well as abdominal desmoid tumors, that will be documented before during and after treatment. In parallel, investigators will test polyp, adenoma and desmoid tissue samples as well as blood samples from these patients for changes in expression levels of the APC protein and related oncogenic markers.
Suppression of nonsense mutations within the APC gene should be of benefit for patients suffering from FAP, attenuated FAP or multiple adenomas and for patients with advanced or diffuse CRC. Furthermore, given the rapid progress being made in the identification of different nonsense mutations in human genes that lead to mostly un-curable disease, the identification of clinically approved compounds that suppress nonsense mutations and that can be administered long-term without significant side effects would open new venues in the treatment of genetic human diseases that arise from pre-mature stop codons in important coding sequences.
Immediate goal: establish the ability of erythromycin to read-through APC nonsense mutation in FAP patients. The read-through effect of erythromycin will be clinically tested by counting and measuring the number and size of both colonic and duodenal adenomas before and over treatment and by measuring the size of known desmoid tumors. Samples of the adenomas and desmoid tumors will be tested by western blot, immunofluorescence and immunohistochemistry for restoration of APC expression and changes in oncogenic markers. These experiments should be conducted within 6 month.
Long term objective:
- Determine the lowest dose of erythromycin that can inhibit growth of colonic neoplasia and CRC in patients expressing a truncated APC protein due to nonsense mutations.
- Examine the ability of a panel of additional macrolide antibiotics to induce APC nonsense mutation suppression using in-vitro methods. Investigators will focus on macrolide antibiotics that are currently in clinical use and are administrated for long terms. These objectives should take around 6 month and will be conducted in parallel.
|Condition or disease||Intervention/treatment||Phase|
|FAP-Familial Adenomatous Polyposis||Drug: Erythromycin||Phase 4|
|Study Type :||Interventional (Clinical Trial)|
|Estimated Enrollment :||15 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||Erythromycin Treatment for Readthrough of APC Gene Stop Codon Mutation in Familial Adenomatous Polyposis-protocol is Identical to Study No. 0519-10-TLV- Minors' Adjusted Version|
|Study Start Date :||June 2015|
|Estimated Primary Completion Date :||December 2017|
|Estimated Study Completion Date :||December 2017|
Oral treatment with Erythromycin 250-500mg (will be determined according to body weight) twice a day.
Oral Treatment with Erythromycin 250-500mg, twice daily, for 16 weeks.Exact dose is subjected to body weight and will be determined by the study's pediatrician.
- Evaluation of changes in number of adenomas measured by upper endoscopy [ Time Frame: After 8,16 weeks and 12 months ]Change in number of adenomas from baseline will be measured by endoscopic and histological evaluation. response will be tested by upper and lower endoscopies after 8 ,16-20 weeks and 12 months of treatment.
- Evaluation of changes in size of adenomas measured by lower endoscopy [ Time Frame: After 8,16 weeks and 12 months ]Change in number of adenomas from baseline will be measured by endoscopic and histological evaluation. response will be tested by upper and lower endoscopies after 8 ,16-20 weeks and 12 months of treatment.
- Evaluation of changes in size of desmoid tumors [ Time Frame: At the begining of the trial (before treatment) and at the end of the treatment (after 4-6 months) ]Desmoids imaging (US or CT or MRI) will be performed to determine the size at the begining of the study and to evaluate the change from baseline after 4-6 months of treatment.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02354560
|Contact: Reut Elya, Ms.Cemail@example.com|
|Contact: Sivan Aharon Kaspi, Bs.Cfirstname.lastname@example.org|
|Study Director:||Revital Kariv, MD||Department of Gastroenterol Tel Aviv Medical Center, Sackler Faculty of Medicine, Tel Aviv University.|
|Study Director:||Rina Rosin-Arbeseld, Ph.D||Department of Anatomy Sackler Faculty of Medicine, Tel Aviv University.|