CXCL8 and small cell lung carcinoma: However, IL-8 secretion by SCLC cells was almost negative at 24 h and detectable in only three of six SCLC cell lines at 48 h: 162 pg ml−1 106 cells−1 in H69, 109 pg ml−1 106 cells−1 in H345 and 100 pg ml−1 106 cells−1 in H711 (Figure 1B).