JPMorgan CEO Jamie Dimon told his employees that he has 'curable' throat cancer.
In a note to staff, Dimon said, "The good news is that the prognosis from my doctors is excellent, the cancer was caught quickly, and my condition is curable."
In after-hours trading, the bank's shares slid 0.7 percent after the news.
JPMorgan's board of directors has been briefed on his condition, which will likely call for about eight weeks of radiation and chemotherapy at Memorial Sloan Kettering in New York City, according to the note. The cancer is believed to be contained in Dimon's throat and lymph nodes on his right side.
"I feel very good now and will let all of you know if my health situation changes," Dimon's note said.
Dimon has been CEO of the bank since December 2005, and added the chairman title in December 2006.