This is a Phase II, Open, Single-center Study of Camrelizumab and Fluzoparib as Consolidation Treatment for Patients With Extensive stage small cell lung cancer Who Have Not Progressed after first-line treatment

Inclusion Criteria:

1. All subjects were required to sign the informed consent before starting the study;
2. Histologically documented Extensive stage small cell lung cancer；
3. ECOG PS 0~1 ；
4. 18-75 years；
5. According to recist1.1, CR or PR was achieved after 4-6 cycles of first-line etoposide and platinum chemotherapy;
6. .Life expectancy ≥ 3 months；

Exclusion Criteria:

1. Recurrence or distant metastasis of localized small cell lung cancer after chemotherapy or concurrent chemoradiotherapy；
2. Active infection including tuberculosis, HIV, hepatitis B and C；
3. Interstitial pneumonia (ILD), drug-induced pneumonia, radiation-induced pneumonia requiring steroid therapy or active pneumonia with clinical symptoms, or other moderate to severe lung diseases that seriously affect lung function;
4. Severe infection existed, including but not limited to infection complications, bacteremia, severe pneumonia, etc;
5. Symptomatic brain metastasis and cancerous meningitis;