Nine percent of women with postmenopausal bleeding have endometrial cancer

According to a meta-analysis performed by Clarke MA et al. 9% of women with postmenopausal bleeding have endometrial cancer. The authors analyzed data from 40790 unique patients in 129 studies published January 1, 1977, through January 31, 2017. They found that 90% of women with endometrial cancerhave postmenopausal bleeding; however, only 9% of women with postmenopausal bleeding were diagnosed with endometrial cancer. 

Source:
https://jamanetwork.com/journals/jamainternalmedicine/article-abstract/2695509