Accordingly, cytokine arrays identified increased secretion of cytokines known to recruit and activate macrophages, including CSF1, CCL2 and MCP3 (also known as CCL7)34 in the supernatant of irradiated mouse SCLC cells compared to controls (Extended Data Fig. 7d and Supplementary Table 5). The gene discussed is CCL2; the disease is small cell lung carcinoma.