Hi, Thanks for writing in. Sorry to hear about the cancer your father is having. It appears that his primary is in the lung and now it has spread to the liver making it stage 4 cancer. Stage 4 cancer have a survival of 2 years with recommended treatment and support. If his general condition is weak then he must be provided with nutrition containing high level of proteins. Please give him fluids and semi solids that is easy to digest. Ask him the food he likes and try to give it in small quantities are frequent intervals. Once his general health is better then he will be able to tolerate chemotherapy. In many patients the newer chemotherapy agents work well and can extend his life for few months. You can ask his doctors to give him pain relief medicines. Once his pain is reduced then he will feel more comfortable and then start eating better. By going for combination chemotherapy you can slow down the disease progress. Please do not worry.