Myriad Genetics Inc., (NASDAQ:MYGN), a leader in molecular diagnostic testing and precision medicine, today announced that Japan's Ministry of Health, Labour and Welfare (MHLW) has approved the use of the MyChoice® Test for prostate cancer patients as a companion diagnostic for Lynparza® (olaparib). With this approval, clinicians can now order the MyChoice Test to determine homologous recombination deficiency (HRD) status for patients with ovarian cancer, and BRCA1/2 status for breast and prostate cancers.