A Phase I Trial of Tamoxifen and 9-Cis-Retinoic Acid in Breast Cancer Patients

Summary

This is a dosage escalation study to estimate the maximum tolerated dose of 9-cis-retinoic acid given in combination with tamoxifen. Groups of 3 to 6 patients receive oral 9-cis-retinoic acid daily for 4 weeks, after which daily oral tamoxifen is added to the regimen. Patients continue treatment for up to 28 weeks, with tamoxifen continued after the study if medically appropriate.

Timeline

Start

1996-05

Primary completion

—

Completion

2002-01

Publications

• Background Fontana JA. Interaction of retinoids and tamoxifen on the inhibition of human mammary carcinoma cell proliferation. Exp Cell Biol. 1987;55(3):136-44. doi: 10.1159/000163409.
• Background Welsch CW, DeHoog JV. Retinoid feeding, hormone inhibition, and/or immune stimulation and the genesis of carcinogen-induced rat mammary carcinomas. Cancer Res. 1983 Feb;43(2):585-91.
• Background Jordan VC, Murphy CS. Endocrine pharmacology of antiestrogens as antitumor agents. Endocr Rev. 1990 Nov;11(4):578-610. doi: 10.1210/edrv-11-4-578. No abstract available.

Drugs

Indications