Lapatinib and Tamoxifen in Treating Patients With Advanced or Metastatic Breast Cancer — LAPATAM  

Breast Cancer Clinical Trial

Official title: Pharmacokinetics Study of Combined Treatment Lapatinib and Tamoxifen in Advanced/Metastatic Breast Cancer

Status Completed

Clinical Trial Summary

RATIONALE: Lapatinib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Estrogen can cause the growth of breast cancer cells. Hormone therapy using tamoxifen may fight breast cancer by blocking the use of estrogen by the tumor cells. Giving lapatinib together with tamoxifen may be an effective treatment for breast cancer.

PURPOSE: This randomized phase I trial is studying the side effects of lapatinib and tamoxifen in treating patients with advanced or metastatic breast cancer.

Clinical Trial Description

OBJECTIVES:

Primary

• Determine the pharmacokinetics of lapatinib ditosylate and tamoxifen citrate in patients with advanced or metastatic breast cancer.

Secondary

• Assess the safety of this regimen in these patients.

• Determine any relationship between drug exposure and adverse events or biological modifications of this regimen in these patients.

• Assess the antitumor activity of this regimen in patients with measurable disease.

OUTLINE: This is an open-label, randomized, multicenter study. Patients are randomized to 1 of 2 treatment arms.

• Arm I: Patients receive oral tamoxifen citrate on days 1-28 of course 1. In all subsequent courses, patients receive oral tamoxifen citrate and oral lapatinib ditosylate on days 1-28. Courses repeat every 28 days in the absence of disease progression or unacceptable toxicity.

• Arm II: Patients receive oral lapatinib ditosylate on days 1-14 of course 1. In all subsequent courses, patients receive oral lapatinib ditosylate and oral tamoxifen citrate on days 1-28. Courses repeat every 28 days in the absence of disease progression or unacceptable toxicity.

In both treatment arms, blood is collected periodically during courses 1 and 2 for pharmacokinetic studies.

After completion of study treatment, patients are followed periodically.

PROJECTED ACCRUAL: A total of 20 patients will be accrued for this study. ;

Related Conditions & MeSH terms

• Breast Cancer
• Breast Neoplasms

• NCT number: NCT00424164
• Study type: Interventional
• Source: European Organisation for Research and Treatment of Cancer - EORTC
• Status: Completed
• Phase: Phase 1
• Start date: November 2006
• Completion date: May 28, 2010