Hey, I've been waiting to write you all day. Don't get discouraged if the replies aren't exactly rolling in...
I was doing really well with my own weight loss last march, when I was diagnosed with a 4.5 cm seminoma testicular tumor. I had it removed with clean margins, like your renal cell carcinoma, and I elected to have the adjuvant radiation upon the advice of my physician, as well as the fact that he had one of the newest, best image-guided radiation therapy machines. You can read more about that in my diary (Abilor's diary), but I also gained back about thirty pounds.
Even when you're fine, living with a cancer diagnosis is a five year sentence, as you already know. I simply got sick of waiting around for a recurrence, and have finally decided to take the bull by the horns, and get this weight off for good. It will help your body detox, making recurrence and any additional tumors (even from cancer treatment) less likely. There's no "magic" answer though, and I just wanted to let you know that we're in pretty similar boats. Fun, huh!
At least we're doing it for health, not to lose 2 sizes to fit in that wee bikini.
As far as your daughter, well, that's one hell of an ante. My wife specializes in learning a lot of homeopathy, and there's a surprising amount you can do for autism? I'm sure you've read a lot, but have you heard about: the vaccination hypothesis? The plastics hypothesis?