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Tamoxifen Prediction Study in Patients With ER+ Breast Cancer

NCT05525481 · Status: RECRUITING · Phase: PHASE4 · Type: INTERVENTIONAL · Enrollment: 100

Last updated 2023-11-01

No results posted yet for this study

Summary

Adjuvant treatment with tamoxifen is the standard of care for women with estrogen receptor positive (ER+) breast cancer. Tamoxifen is converted to endoxifen, its active metabolite, via CYP2D6 enzymes. The literature states that an endoxifen concentration of at least 16 nmol/L is needed to produce a therapeutic effect (4). Therapeutic Drug Monitoring (TDM) has been proven to be a successful technique to reach the 16 nmol/L endoxifen threshold after 6 months. However, in general TDM can only be used when a drug is in steady-state, which for endoxifen is reached after 3 months for normal metabolizers. For poor- and intermediate metabolizers, the time until steady-state is presumably even longer. This could possibly result in undertreatment within the first 3 to 6 months of tamoxifen treatment. In this study, model-informed precision dosing (MIPD) will be used to counter this problem. The Pharmacokinetic-model, which is used for MIPD, includes CYP2D6 genotype, co-medication, age, body height, BMI and CYP2D6/CYP3A inhibitor use to predict a patient tailored dose. Using MIPD, our aim is to decrease the proportion of patients that are undertreated within the first three months of tamoxifen treatment.

Conditions

  • ER+ Breast Cancer

Interventions

DRUG

Tamoxifen

Hormone therapy

Sponsors & Collaborators

Study Design

Allocation
NA
Purpose
TREATMENT
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Sex
FEMALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2022-11-01
Primary Completion
2023-12-31
Completion
2024-02-28

Countries

  • Netherlands

Study Locations

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Entities

Companies

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT05525481 on ClinicalTrials.gov