PGR and neoplasm: As summarized in Table 3, there was no significant between-group difference in tumour biology, including grade (P = 0.303), size (P = 0.916), lymph node status (P = 0.130), oestrogen receptor positivity (P = 0.957), progesterone receptor positivity (P = 0.278), and HER2 receptor positivity (P = 0.959).