SinTilimab After Radiation (STAR Study)

"Sintilimab 200mg IV, every 3 weeks, until progressive disease (PD), intolerable toxicity, or at a maximum of 24 months.~Before enrollment, patient should undergo radiation no less than dose 30Gy( 6 Gy × 5, or other ), or the planned dose could reach 30 Gy. Sintilimab shall be started no later than 3 weeks after radiation. Radiotherapy can be performed on the same day as sintilimab."