An analysis of KLF4 and YY1 expression levels in different subtypes of B-cell lymphomas was performed using a public data set of microarrays retrieved from the Oncomine and Gene Expression Omnibus databases, derived from a published analysis reported by Compagno et al. [25] The microarray data were from 108 tumor samples out of the 136 samples present in a related data set. This evidence concerns the gene YY1 and B-cell non-Hodgkin lymphoma.