The GEO (series http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE11392) (Fig. 2C) and Oncomine (Fig. 2D) databases both showed that there were no differences in LCK expression between CNS DLBCL (PCNSL) and non‐CNS DLBCL. This evidence concerns the gene LCK and primary central nervous system lymphoma.