Study of cervical cancer patients with I-III stage was performed with biomarker determination of the blood DNA radiosensitivity ex vivo. The biochemical index was measured before treatment start during 4 hours by use fluorescent dye. The relationship between changes of these index levels and volume tumor reductions after radiochemical treatment evidenced that blood DNA radiosensitivity was enabled to predict an outcome of the cervical cancer patient treatment earlier than the assessment of therapy efficacy by help of ultrasound measurements.