CXCL6 and small cell lung carcinoma: After 24 h, the concentration of GCP-2 in the SCLC-conditioned medium was 1080±72 pg ml−1/2 × 106 cells in H711, 907±40 pg ml−1/2 × 106 cells in H345, 377±24 pg ml−1/2 × 106 cells in H69, 346±31 pg ml−1/2 × 106 cells in GLC-19 and 216±30 pg ml−1/2 × 106 cells in Lu165.