history: My boss has cancer, so I'm trying very hard to work extra to make things easier for her.  My boss was diagnosed with cancer earlier this summer. I've been trying very hard to work extra to make things easier for her.
current: That is really kind of you, many people would not bother. I hope that she wins her battle.
next: We are very confident she will! Thankfully they caught it early, but the treatment is just really difficult.