Under the income tax law in India, section 80DDB, a person who spends on the treatment for self, or spouse, children, siblings, can deduct some of these expenses for tax purposes.
http://www.caclubindia.com/forum/deductions-allowable-for-cancer-patients-71719.asp
http://www.caclubindia.com/forum/deduction-u-s-80ddb-in-respect-of-medical-treatment-23383.asp