[Synergetic responses after administration of interleukin-2 and Interferon-alpha combined with gamma knife radiosurgery in a patient with multiple lung and brain metastases: a case report].

A 51-year-old man with left renal tumor and multiple lung metastases was admitted to our hospital for treatment. Left nephrectomy was performed, and pathological diagnosis was renal cell carcinoma (clear cell carcinoma, G2, pT3a). Initially, Interferon-alpha (IFN-alpha) therapy was started for lung metastases. About 40 days after surgery, head magnetic resonance imaging revealed brain metastases, and therefore gamma knife radiosurgery(GKS) was performed. Since chest computed tomography showed no change in lung metastases, we tried a combination of interleukin-2 (IL-2) and IFN-alpha therapy to elininate those metastases. As a result, neither lung nor brain metastases could be detected at the 4th month follow-up examination. At 5 months after the IL-2 and IFN-alpha therapy, the patient attempted suicide. Therefore, the IL-2 and IFN-alpha therapy was stopped and an antidepressant was prescribed. Now 11 months after withdrawal of the IL-2 and IFN-alpha, the patient's mental condition remains stable. No recurrence of the cancer has been detected by CT.