ERCC1 and small cell lung carcinoma: Subgroup analysis based on ethnicity indicated that ERCC1 expression was not related to the ORR to platinum-based chemotherapy for SCLC patients both among Asian (OR = 1.13, 95%CI = 0.62–2.09, I2 = 37.3%, P = 0.20 for heterogeneity) (Table 2) and Caucasian population (OR = 0.77, 95%CI = 0.43–1.38, I2 = 9.0%, P = 0.33 for heterogeneity) (Table 2).