Myriad Genetics Blog Myriad Genetics Blog > National HBOC Week and National Previvor Day National HBOC Week and National Previvor Day September 24, 2012 Breast Cancer Ovarian Cancer In 2010, Congress passed a resolution declaring the last week of September as National Hereditary Breast and Ovarian Cancer (HBOC) Week (September 23–30, 2012) and the last Wednesday of the month as National Previvor Day (September 26, 2012). THE BRAC CHALLENGE During HBOC Week, Myriad will donate to Bright Pink, NOCC (National Ovarian Cancer Coalition), and LBBC (Living Beyond Breast Cancer).