The expression of Cox-2, Ki67 and ORa was determinedby IHC through counting labelled cells. Tocompare the tumour type (follicular or medullary),a non-parametric analysis was used to evaluate thescore and the immunolabelling index for Cox-2 andKi67, respectively. A ManneWhitneyUtest was performedand differences between groups were consideredsignificant at P