Mercaptopurine for the Treatment of Hereditary Leiomyomatosis and Renal Cell Carcinoma (HLRCC), Uterine/Cutaneous Leiomyomas, and Kidney Cancer

This phase I/II trial studies the side effects and best dose of mercaptopurine, and to see how well it works in treating patients with hereditary leiomyomatosis and renal cell carcinoma (HLRCC). HLRCC is a rare inherited disorder that increases the risk of developing benign (not cancer) tumors of the skin and the uterus (leiomyomas) and malignant (cancer) tumors of the uterus (leiomyosarcoma) and the kidney. Mercaptopurine is in a class of medications called purine antagonists. It works by stopping the growth of cancer cells.

NCT Number	NCT07716735
Lead Sponsor	Jonsson Comprehensive Cancer Center Collaborators: The V Foundation, Phase One Foundation
Conditions	Advanced Kidney Carcinoma, Advanced Renal Cell Carcinoma, Hereditary Leiomyomatosis and Renal Cell Carcinoma, Metastatic Kidney Carcinoma, Metastatic Renal Cell Carcinoma, Skin Leiomyoma, Stage III Renal Cell Cancer AJCC v8, Stage IV Renal Cell Cancer AJCC v8 +1 more
Enrollment	18 participants
Start Date	2026-12-01
Primary Completion	2034-12-01 (estimated)
Study Completion	2035-12-01 (estimated)
Updated on ClinicalTrials.gov	2026-08-06