 Bothered by shoulder pain for about a month, Allen had outpatient surgery in Boise for a biopsy three days prior to the 1994 championship game, and was diagnosed two days after the game with rhabdomyosarcoma, a rare form of muscle cancer.The tumor in his upper right arm was removed in March and he underwent extensive chemotherapy and a stem-cell transplant in July at the Fred Hutchinson Center in Seattle.He returned to coach the Broncos in 1995 while going through treatment, and the cancer was declared in remission in December 1995, but the doctors warned of likely recurrence.