They have basically moved away ( at least for now) conventional chemotherapy and are now using targeted drugs like the B-raf and MEK inhibitors and Immunotherapy drugs like Ipilimumab ( yervoy) Nivolumab (opdivo) and Keytruda...they basically take off the brakes and kick up the immune system ( the opposite of chemo which kills fast growing cells, good and bad ones) . IL-2, interferon were the oldest drugs approved by the FDA for melanoma. Leukine is different in that it is a man-made protein that stimulates the growth of white blood cells in your body. Interferon is also a group of proteins known as cytokines, molecules used for communication between cells to trigger the protective defenses-they are found in the body and also man made...they don't do much for melanoma but do have some nasty side effects. Ipilimumab ( yervoy) Nivolumab (opdivo) and Keytruda are considered the gold star of melanoma treatments now. They are also doing TIL therapy but it is more complicated and does not have as high of response rate as Nivolumab or Keytruda.