My son had in december a lung tumor removed as well as a month ago. He had now 3 reoccurances of his synovial sarcoma and after 1 1/2 year on the pazopanib, he had temodar and irrinotecan for the last 6 months. Now he all of a sudden has mononucleosis! Really?!? has anyone experienced this or can this be a side effect of all the chemo's in the last 5 year?