Yervoy (ipilimumab) is a medication that is used to treat different types of cancer. It is a type of immunotherapy that works by activating the immune system to attack cancer cells. According to the sources provided, Yervoy is used to treat melanoma, which is a type of skin cancer that has spread to other parts of the body [1][2][3]. It is also used to treat advanced renal cell carcinoma, which is a type of kidney cancer [1]. Additionally, Yervoy is used in combination with other medications to treat certain types of lung cancer [2]. It is important to note that Yervoy may not be suitable for everyone, and treatment decisions should be made in consultation with a healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/YERVOY
[2] https://www.cancerresearchuk.org/about-cancer/treatment/drugs/ipilimumab-yervoy
[3] https://www.cancer.gov/about-cancer/treatment/drugs/ipilimumab