Women whose breast cancer is detected by mammography have a lower risk of the cancer recurring after treatment compared to those who discover a tumor by other means, a Finnish study said on Tuesday. Women with cancerous tumors detected outside of the mammography screening process -- usually a manual breast exam -- had a 90 percent higher risk of the disease recurring elsewhere in their bodies within a decade, compared to women whose tumors were detected by mammography, study author Dr. Heikki Joensuu of Helsinki University Central Hospital said.