PGR and neoplasm: To be able to quantitatively assess the association of PR status with T-stage, we compared the dose–effect curves of four subgroups tumours: (i) PR negative and T-stage 1 or 2, (ii) PR negative and T-stage 3 or 4, (iii) PR positive and T-stage 1 or 2 and (iv) PR positive and T-stage 3 or 4.