Cancer Control 321 determine the inherent risk they presented. Over 10,000 specimens were divided into three groups: nonproliferative lesions,proliferative lesions without atypia, and proliferative lesions with atypia. Their findings suggested a 1.9 times greater risk for proliferative lesions without atypia and 5.3 times greater risk for proliferative lesions with atypia.1,2 Subsequent case-co...