Torisel, also known by its generic name temsirolimus, is a medication primarily used in the treatment of advanced renal cell carcinoma, a type of kidney cancer. It belongs to a class of drugs known as mTOR inhibitors, which work by blocking the action of a specific protein (mTOR) that regulates cell division, growth, and survival. By inhibiting this protein, Torisel helps to slow down the growth and spread of cancer cells. It is administered through intravenous infusion, meaning it is given directly into a vein, usually by a healthcare professional in a hospital or clinic setting. Torisel's use may be associated with various side effects, and its administration is carefully monitored by healthcare providers to manage any adverse reactions and to ensure its effectiveness in treating cancer.