Prevalence of Genetic Polymorphisms in Genes Coding for Tamoxifen Metabolising Enzymes

NCT ID: NCT00966043

Last Updated: 2015-10-28

Basic Information

• Recruitment Status: COMPLETED
• Total Enrollment: 158 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2009-06-30
• Study Completion Date: 2011-07-31

Brief Summary

CYPTAM-BRUT 3 is a prospective, multicentric study in Belgium within the CYPTAM study of the Leiden University Medical Center (NTR1509) including postmenopausal women receiving tamoxifen for estrogen-receptor positive breast cancer in the adjuvant setting. The primary endpoint is the difference in uterine changes between women with a normal versus low TAS after 3 months of tamoxifen use. Secondary endpoints are serum metabolite concentrations, serum follicle-stimulating hormone level, serum sex hormone-binding globulin level and menopausal symptoms. These patients are registered in the Leiden protocol with time to breast cancer event as primary endpoint.

Detailed Description

We will study the impact of the 'tamoxifen activity score' - based on functional genetic polymorphisms for tamoxifen metabolism and the use of drugs that interfere with tamoxifen-against tamoxifen related endpoints like uterine changes and subjective menopausal symptoms.

The prevalence of genetic polymorphisms in the CYP2D6 and other genes and differences in usage of drugs interacting with tamoxifen metabolism will be compared between women with and those without endometrial thickening on one hand and between women with and those without hot flashes on the other hand. Tamoxifen use in adjuvant setting.

• "Tamoxifen activity score" (23): The endpoints will be correlated with a predefined 'tamoxifen activity score' which is based on the presence of single nucleotide polymorphisms (SNP) in relevant genes combined with the effect of well known drugs that interfere with the metabolism of tamoxifen. The 'tamoxifen activity score' has been associated with tamoxifen compliance by a group in the US (23). The score will be adapted to the Belgian situation based on the prevalence of these SNPs in a Belgian population of volunteers for blood donation and consecutive breast cancer patients.
• The study setting are postmenopausal women with an early ER- positive breast cancer and not previously treated with an endocrine agent or hormone replacement therapy, with an intact uterus and clearly measurable thin endometrium/uterus. N =250

Conditions

Breast Neoplasms

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: PROSPECTIVE

Eligibility Criteria

Inclusion Criteria

• Female > 18 years of age
• Written and voluntary informed consent understood signed and dated
• Histologically or cytologically confirmed measurable invasive adenocarcinoma of the breast, amenable to curative therapy.
• Patients must be postmenopausal as defined by criteria in appendix 1.
• Breast cancer should be considered as oestrogen receptor positive by the clinician using immunohistochemistry readings as is standard procedure for local pathologist
• Prior endocrine tamoxifen therapy is not allowed
• Patients are not previously treated with an endocrine agent or hormone replacement therapy needs being stopped for at least 6 months.
• Prior chemotherapy and radiotherapy is allowed
• Adequate renal and liver function Serum creatinine and serum bilirubin ≤ 1.5 X ULN Serum ALT and AST ≤ 2.5 X ULN (or ≤ 5 in case of liver metastases)
• Serum calcium should be ≤ 11,6 mg/dl
• ECOG performance status 0,1,2 (appendix 2)

Exclusion Criteria

• Male
• Life threatening disease requiring a quick response (eg, extensive hepatic or pulmonary involvement)
• Use of any endocrine treatment or recent/current use of hormone replacement therapy.
• Contra indication for tamoxifen: history of DVT/vaginal bleeding of unknown origin
• Dementia
• History of other malignancy that may interfere with at least 6 months of tamoxifen therapy

• Minimum Eligible Age: 18 Years
• Eligible Sex: FEMALE
• Accepts Healthy Volunteers: No

Sponsors

Vlaamse Vereniging voor Obstetrie en Gynaecologie

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Patrick Neven

Role: PRINCIPAL_INVESTIGATOR

UZ Leuven

Locations

AZ St-Maarten

Duffel, Antwerpen, Belgium

AZ St-Nikolaas

St-Niklaas, Antwerpen, Belgium

Ziekenhuizen Oost-Limburg Camus St-Jan

Genk, Limburg, Belgium

AZ St-Blasius

Dendermonde, Ookst-Vlaanderen, Belgium

Maria-Middelares

Ghent, Oost-Vlaanderen, Belgium

UZ

Ghent, Oost-Vlaanderen, Belgium

UZ

Leuven, Vlaams-Brabant, Belgium

Heilig-Hart Ziekenhuis

Roeselare, West-Vlaanderen, Belgium

Institut Bordet

Brussels, , Belgium

UZ

Brussels, , Belgium

UCL

Brussels, , Belgium

Countries

Belgium

Other Identifiers

S 51521

Identifier Type: -

Identifier Source: secondary_id

Eudract 2009-010059-28.

Identifier Type: -

Identifier Source: org_study_id