An intra-abdominal spindle cell soft tissue sarcoma in the colon wall with associated endometriosis was found to have a WWTR1::AFF1 gene fusion (Dashti et al. 2022), and a case of ossifying fibromyxoid tumor showed a KDM2A::WWTR1 gene fusion, with the entire coding frame of WWTR1 as a C-terminal attachment fused to KDM2A (Kao et al. 2017). This evidence concerns the gene WWTR1 and endometriosis.