Table 2.

Evaluation of PR—receptor status (according to Remmele and Stegner [28])

Progesterone receptor status
IRS = Staining intensity × percentage of positive cells
	0 = absent	1 = <10%
	1 = weak	2 = 10–50%
	2 = moderate	3 = 51–80%
	3 = strong	4 = >80%
IRS >2 is considered PR—positive