POSTN was found to be overexpressed in several human cancers including ovarian [28], [30], colon [29], pancreatic [25], [27], breast [31], [32], lung cancer [33], and melanoma [34], with contradictory data concerning the identity of periostin-expressing cells (i.e. stroma, tumor cells or both). The gene discussed is POSTN; the disease is lung carcinoma.