In our opinion, it is likely that MMT in PMCs exposed to TGF-β1 in those papers could be considered an artifact because the CM from ovarian cancer cells has significantly lower levels of this factor (100–170 pg/mL in the CM from A2780/SKOV-3 cells and 300–450 pg/mL in the CM from HGSOCs). Here, TGFB1 is linked to ovarian cancer.