PLK1 and small cell lung carcinoma: The CGP study also identified drug sensitivities that tended to cluster across all cell lines (see Supplement Table 1 in reference 11) and the drug sensitivity profile for SCLC cells, as shown in Table 1, is very similar to cluster 4 of the CGP study [cluster 4  =  GW-843682X (PLK1), BI-2536 (PLK1/2/3), A-443654 (AKT1/2/3), Epothilone B (microtubules), CGP-60474 (CDK1/2/5/7/9), Paclitaxel (microtubules) and MS-275 (HDAC)].