Abstract: The present invention relates to treatment regimes and combination products of 20,20,21,21,21-pentafluoro-17-hydroxy-11?-[4-(hydroxyacetyl)phenyl]-19-nor-17?-pregna-4,9-dien-3-one of the formula This invention relates in particular to sequential regimes for the treatment of gynaecological disorders in which the abovementioned progesterone antagonist is administered in a first phase, and a progestogen is administered in a second phase.