There was another product called "Prosure" which is specifically made for cancer patients. I heard they were going to stop making it though - hope that isn't the case. Prosure is made by Ross Nutrition/Abbott Labs. I still have some and it says on the can that Prosure is a blend of an Omega-3 fatty acid and protein. A search on the internet will find:
"ProSure is a new therapeutic nutritional product created for people who experience cancer-induced weight loss. A clinical study among people with cancer has shown that drinking 2 servings of ProSure daily as part of overall care promoted weight gain, helped build muscle, increased physical activity, improved quality of life, and increased strength in those who gained weight."