We then focused on ERCC1 detection method, only two studies [21], [24] using RT-PCR showed a significant association between the expression of ERCC1 and the OS in patients with SCLC (HR = 1.37, 95% CI = 1.06–1.78, I2 = 0.0%, P = 0.74 for heterogeneity; Table 2). This evidence concerns the gene ERCC1 and small cell lung carcinoma.