Bee Gees singer Robin Gibb has advanced stage colorectal cancer, his doctor confirmed to The Associated Press.

Dr. Andrew Thillainayagm says that Gibb, 62, is in intensive care after waking up from a coma over the weekend. The singer had contracted pneumonia because he was weakened from chemotherapy and two operations.

Robin Gibb wakes up from coma

Gibb is "exhausted, extremely weak and malnourished," Thillainayagm said, adding, "It is testament to Robin's extraordinary courage, iron will and deep reserves of physical strength that he has overcome quite incredible odds to get where he is now."