To clarify whether MALAT1 contributed to the M2 macrophages induced PCa tumorigenesis, we interrogated the publicly available microarray datasets derived from human benign prostatic hyperplasia (BPH), localized prostate cancer (L-PCa), and metastatic prostate cancer (M-PCa) in Gene Expression Omnibus (GEO, www.ncbi.nlm.nih.gov/geo/). This evidence concerns the gene MALAT1 and benign prostatic hyperplasia.