Cancer (song)

"Cancer" is a song by the American rock band My Chemical Romance, released as the eighth track from their third studio album, The Black Parade (2006). A piano ballad, "Cancer" was conceived by Gerard Way and written in eight minutes by him and Rob Cavallo. The song was written by band members Bob Bryar, Frank Iero, Ray Toro, Gerard Way, and Mikey Way, and was produced by the group alongside Cavallo.

The song's lyrics focus on The Patient, the dying protagonist of The Black Parade, and depict his struggles with cancer. "Cancer" was praised by music critics for its sentimentality, though its bleakness was deemed excessive by some; nonetheless, it has been regarded as one of the best songs in the band's discography as a whole. The song has been certified gold in the United States by the Recording Industry Association of America (RIAA), and has notably been covered by American duo Twenty One Pilots in 2016.