 Pincus, along with Min Chueh Chang, confirmed earlier research that progesterone would act as an inhibitor to ovulation.In 1952, Sanger told her friend Katharine McCormick about Pincus and Chang's research.Frustrated by PPFA's meager interest and support, McCormick and Sanger met with Pincus in 1953 to dramatically expand the scope of the research with 50-fold increase in funding from McCormick.