Treatment of metastatic disease is palliative in intent.  Goals of treatment include prolonging life and improving quality of life.  Although median survival has been reported to be 18 to 24 months, some patients experience long-term survival.  Among patients treated with systemic chemotherapy at a single institution between 1973 and 1982, 263 patients (16.6%) achieved complete responses.  Of those, 49 patients (3.1% of the total group) remained in complete remission for more than 5 years, and 26 patients (1.5%) were still in complete remission at 16 years.

Source:  NCI 2019 Health Professional Version