The tumour was diagnosed after McCain, who was the Republican presidential candidate in 2008 elections, underwent a procedure to remove a blood clot from his left eye. Republican Senator John McCain, who is the chairman of the powerful Senate Armed Services Committee, has been diagnosed with brain cancer, Mayo Clinic hospital has said. That isn't a cure; cancerous cells that aren't visible still tend to lurk, the reason McCain's doctors are considering further treatment, including chemotherapy and radiation. McCain has repeatedly been treated for skin cancer, having had four melanomas removed: one on his shoulder in 1993; one on his left arm and one on his left temple in 2000; and one on his nose in 2002.
U.S. Senator John McCain is diagnosed with a malignant brain cancer, glioblastoma multiforme. This is his second battle with cancer, after having been successfully treated for malignant melanoma.