The Long-term Benefit of Hydrogel Spacer in Reducing Rectal Radiation Dose in Cervical Cancer Radiation Therapy.

This study is an exploratory study based on the previous study \" A prospective, multicenter, randomized, parallel arm-controlled, superiority clinical study to evaluate the role of hydrogel spacer in reducing rectal radiation dose in cervical cancer radiation therapy\", in which additional follow up study on the subjects of the previous study were conducted. Subjects (6 subjects in Phase I; 100 subjects in Phase II, 50 in the test group and 50 in the control group) who completed the pre-study will be enrolled in this study if they are willing to participate in the long-term follow-up by signing the informed consent form.