To clarify whether MYCL as well as MYC, MYCN and ASCL1 were transcriptionally suppressed by JQ1 in SCLC cells, we further performed mRNA microarray analysis in 12 of the 14 SCLC cell lines, which were collected after 24 hours of culture with and without 1.0 μM of JQ1. The gene discussed is MYCL; the disease is small cell lung carcinoma.