Abstract
Backgroud: To evaluate the dosimetric parameters, clinical complications, and efficacy of helical tomotherapy(HT) and fixed-field intensity-modulated radiotherapy (f-IMRT) in radical radiotherapy for cervical cancer.Methods: Between November 2016 and December 2018, 77 cervical cancer patients in radical irradiation were enrolled, 38 patients undergoing treatment with HT and 39 with f-IMRT. The dosimetry parameters, clinical complications, and efficacy were compared. Results: The HT plans had superior homogeneity index(HI) , conformity index(CI) (P=0.000),and resulted in a reduction in the dosimetry parameters of organs at risk(OARs) (P<0.05) except the V10 of small intestine (P=0.682).The incidence of myelosuppression showed no significant differences(P=0.265).The patients with HT had no radioactive cystitis, grade 2 or above rectal complication and acute bladder complication. The complete remission(CR) rates ,effective rates(CR+PR) and local control rates of two years were 81.58%,100% and 97.37%.Conclusion: The HT plans showed advantages in dosimetry, and provided more superior clinical outcomes.
EP-1853 Dosimetric comparison of helical tomotherapy and intensity-modulated radiotherapy in cervical cancer