The cancer of Hall of Fame Bills quarterback Jim Kelly has returned. On Monday, he’s scheduled to start a round of chemotherapy. Peter King of TheMMQB.com paints a picture that is both grim and inspirational.

As King explains it, Kelly has “countless microscopic tumors” in his head. A recurrence of the large tumor removed from his jaw in 2013, the new cancer was difficult to diagnose as Kelly experienced migraines that couldn’t be explained. Now, the cancer is spreading deeper into his head, along nerves and arteries. But even though the situation feels bleak, there is plenty of hope.

Dr. Peter Costantino said Kelly’s condition “very treatable and potentially curable.”

“If he’s saying it, I hope so,” Kelly told King. “I just know there’s a lot of work to do, to shrink the cancer. I just pray it works. If you hear I’m about to have surgery, then you know it’s working. That’s the goal. But it won’t be an easy operation.”

Nothing has been easy for Kelly.