This news item is about: The most common and aggressive type of ovarian cancer, ovarian carcinoma, leaves a dark trail. Science has learned too little and most women learn too late to treat the deadly disease. Now Cornell scientists have found ovarian carcinoma’s first proven origin cells and uncovered clues for finding similar sources of other cancers. Published in Nature in March 2013, the study opens paths for new screening methods to detect cancer earlier and increase treatment chances in the ovaries and beyond.