It has been reported that the Forkhead box F2 transcription factor (FOXF2) functions as tumor suppressor in breast cancer, gastric cancer, colorectal cancer, lung cancer and hepatocellular carcinoma (Cai et al., 2015; Higashimori et al., 2018; Zhang et al., 2015; Kundu et al., 2016; Shi et al., 2016). Here, FOXF2 is linked to breast cancer.