In contrast, previously published data from the same group (Tang et al, 1999) showed no correlation between the expression patterns of BAG-1 and that of ER or PgR in invasive breast carcinoma; this could be due to the lower proportion of ER+ and PgR+ tumours, missing data about receptor status, or the smaller cohort size. The gene discussed is PGR; the disease is invasive breast carcinoma.