I would use Marrow Plus at a high dosage if possible (3-4 capsules TID/QID) to tonify his body and to improve anemia. If his digestion is okay I would also add Backbone (2 capsules TID/QID). This helps with the back pain and will help the kidneys, and help spleen to supplement blood. Once the blood is built up you may consider long term administration with Regeneration. The last formula is being used to help overall health of cancer patients.