Sintilimab in Combination With Gemcitabine and Platinum-Based Chemotherapy as First-Line Therapy for Advanced or Metastatic Squamous NSCLC

200mg, Q3W, day1, I.V.; consecutive cycles

1000mg/m\^2, Q3W, day 1and 8, I.V.; first 4 or 6 consecutive cycles.

75 mg/m\^2, Q3W, day1, I.V.; first 4 or 6 consecutive cycles.

NA, Q3W, day1, I.V.; consecutive cycles

AUC 5mg/ml/min, Q3W, day1, I.V.; first 4 or 6 consecutive cycles.