The HR for OS favored patients with low bFGF expression in SCLC (HR = 1.667, 95%CI, 1.035–2.299, I2 = 0%), while bFGF expression did not impact OS in the NSCLC group as a whole (HR = 1.16, 95%CI, 0.973–1.348, I2 = 0%, Fig 4). This evidence concerns the gene FGF2 and small cell lung carcinoma.