The condition and the treatment
Melanoma is a form of skin cancer. Advanced melanoma is when the cancer can't be completely removed by surgery (unresectable) or has spread to other parts of the body (metastatic).
Ipilimumab (also known as Yervoy) is a drug given by injection, which helps the body's immune system to recognise and destroy melanoma cells.
NHS Choices (www.nhs.uk) may be a good place to find out more.