Subjects will receive sintilimab 200mg, IV, Q3W and anlotinib 12mg, PO, QD，d1-14, Q3W treatment until disease progression, unacceptable toxicity, or death.
This is a the researchers launched, single-center, prospective, open-label, single arm ,Phase II clinical study of Sintilimab combined with anlotinib in patients with extensive-stage disease small-cell lung cancer to evaluate the efficacy and safety.~23 patients are expected to be enrolled in this study.