Concessions/Discounts for travel for treatment:
Indian Railways
http://www.dnaindia.com/india/report_soon-free-railway-tickets-for-cancer-patients_1483741
Air India
Air India offers discount for air tickets.
http://home.airindia.in/SBCMS/Webpages/Permits-or-authorization.aspx
Jet Airwarys
http://www.jetairways.com/EN/IN/SpecialOffers/ConcessionalFares.aspx