Kaplan–Meier ovarian cancer-specific survival showing number of women at risk according to grade of serous EOC (8441/3, 8460/3, 8461/3). Women with grade 1 well differentiated serous EOC (blue curve, n = 1,351; 50, 100 & 200-month survival is 80.0%, 66.2%, 55.0%), grade 2 moderately differentiated (red curve, n = 4,526; 50, 100 & 200-month survival is 55.8%, 36.5%, 25.7%), and grade 3 undifferentiated (green curve, n = 15,166; 50, 100 & 200-month survival is 48.3%, 27.7%, 19.0%). The number of women remaining at different survival points is shown for well differentiated screened (blue), moderately differentiated (red), undifferentiated (green) cases. Log-rank test p < 0.001.