A friend of mine just had a masectomy last month. She said the best gifts were the gifts of chores. She said simply not having to thing about dinner eased her mind considerably. So I'd probably add some food gift cards to the basket.
My cousin has been battling Leukemia for the past few years. She says that it's helpful to have things to keep you hands and mind busy while waiting for doctors (or for her, the chemo treatments). So she suggests word searches, sudoku puzzles, embroidery kits, small jewelry making kits or even hand held games.
My cousin's other favorite, was a gag gift. She got a snuggi. But she said that has been a fantastic gift that she uses all the time. When she is cold, she says it's the perfect thing to cuddle up in...even better than a blanket.