Results could help scientists fine-tune tests in coming years
                                
                                
                                    (Newser) -
                                    A huge, international cancer study has identified 74 DNA regions associated with breast, prostate, and ovarian cancers, more than doubling the number of genetic markers known, reports the  Los Angeles Times . The Collaborative Oncological Gene-environment Study, or COGS, combined the research on 250,000 people around the world to create...