The second phase of the treatment program is the experimental part: immunotherapy with IL2. You will be assigned to receive one of 4 doses of IL2. This is because we are testing what is the highest dose of IL2 that a subject can receive without having unacceptable side affects from the IL2. You will give yourself shots of IL2 under the skin twice a day for 5 days per week for 3 weeks. During the 3rd week of treatment there are 2 days when you have to give a higher dose of IL2 for boosting the immune cells (see below diagram). The 4th week will be a rest week where you do not receive treatment. One 4-week period of IL2 treatment is called a cycle. You will continue to receive cycles of IL2 treatment as long as your cancer shows no further growth. We will teach you how to administer the IL2 at home.