MKI67 and neoplasm: As expected from their ERα status, such tumours had significantly higher Ki67 values and lower PgR values than either ERα-positive subgroup (T-test P<0.04, Mann–Whitney P<0.007), but values for these markers were not significantly different from the ERβ1-negative/ERα-negative subgroup (T-test and Mann–Whitney P>0.08).