A pioneering test of period blood for signs of cervical cancer could be a convenient, non-invasive and accurate way of screening for the disease, researchers have said. A regular sanitary pad topped with a blood sample strip can pick up human papillomavirus (HPV), which causes most cases of cervical cancer, and could be used by women at home, the results of a study indicate. Currently, most women undergo cervical screening under the care of a clinician, who collects a sample via a brush inserted into the vagina. But millions of…