When the Singapore cohort was examined with AB-a and AB-c (Figure 3, lower panels), both showed more intense staining in the ER/PR negative group, but as was found for tumour grade, the relationship was much stronger with AB-a (χ2 = 40.71, p<0.005) than with AB-c (χ2 = 28.17, p<0.015). Here, PGR is linked to neoplasm.