PGR and neoplasm: Among the 618 tumours with known ER/PR status, the distribution of ER/PR subtypes was 53% ER+PR+, 6% ER+PR−, 13% ER−PR+, and 29% ER−PR−, and there was no difference in this distribution between tumours diagnosed in 1992–1995 and those diagnosed in 1996–1999 (P=0.1).