PTEN and endometriosis: In accordance with our functional observation of reduced invasiveness of miR‐29c‐3p‐transfected endometriotic cells, a significant upregulation of its target genes CDK6, p21 (CDKN1), PTEN, TCF7L1, TCF7L2, COL4A2, and N‐Cadherin was detected in lesions of deep endometriosis compared to control endometrium.