Make sure you keep track of all your medical expenses, including travel and lodging expenses when going for treatment or consults. Keep track of your mileage to ALL appointments. Most people can't deduct medical expenses on their income tax most years if they are covered by insurance, because it doesn't add up to enough. (7.5% of AGI, I think.) But when you add up all the copays, prescriptions, mileage, insurance premiums, etc. when dealing with cancer, a lot of people will have enough to deduct.
Rainbows & hugs,
Rosie