I've been reading the funnies online, and have slowly gotten sucked into the breast-cancer storyline in "Funky Winkerbean," a strip I don't normally follow. Best I can tell, the character, Lisa, had breast cancer in 1999 (you can follow those strips here), and it's now returned. (Check out this cool interactive character map if you need to know who's who, like I did.)
Some people think serious issues like this shouldn't be dealt with in the comics, but I've always found that if they're handled well, they can be educational, inspiring and yes, even entertaining. As much as I tease Lynn Johnston and her "For Better or For Worse," I was proud she featured a storyline in which Lawrence came out as gay, even having him (briefly) thrown out of his home by his stepdad and mom. Because yes, that happens, and yes, comics reach into homes where no one has ever known a gay person, or where people have (or have not) struggled with cancer, and to see those issues in the comics page is not, I think, a bad thing.