The goal of this observational study is to learn more about the biology of cervical cancer in women who receive radiation therapy for this condition. The main question it aims to answer is: Does radiation therapy alter the expression of tissue factor and other molecules in cervical cancer over time? Participants already scheduled for radiation therapy for cervical cancer as part of their regular medical care will provide blood and biopsies of cervical cancer or of the upper portion of the vagina before, during, and on the last day of radiation therapy.