<qa>  What is the cause of hereditary leiomyomatosis renal cell cancer?This study will investigate what causes hereditary leiomyomatosis renal kidney cell cancer, or HLRCC, and how the disease is related to the development of kidney tumors. Leiomyomas are benign non-cancerous tumors arising from smooth muscle. HLRCC can cause various health problems. Some people develop red bumps on their skin that can be painful at times. Some women with HLRCC can develop leiomyomas of the uterus. In some families, people with HLRCC develop kidney tumors. This study will try to determine: 