Hello there! Unfortunately we are not able to give personalized medical advice. Without knowing specifics and his personal health history, we cannot tailor something to meet his specific needs. Please discuss options with his Dr. or if you can find a personal RD who specializes in this area then he will get the tailored advice he needs. For RDs in your area, check out this link: http://www.eatright.org/programs/rdnfinder/
Also, feel free to post on our Cancer forum. And, check out these two links here on ways to gain weight: http://www.nutriliving.com/blog/trouble-gaining-weight-4-tips-help
*you will need to see about the proper method of consumption. Some Blasts may not be appropriate through a feeding tube.