A Comprehensive Evaluation of the Application of the Halcyon(2.0) IMRT Technique in Long-Course Radiotherapy for Rectal Cancer.

rop-pdf-only no pmc-prop-suppress-copyright no pmc-prop-is-real-version no pmc-prop-is-scanned-article no pmc-prop-preprint no pmc-prop-in-epmc yes pmc-license-ref CC BY-NC typesetter ts19 cover-date January-December 2022 Introduction The incidence rate of rectal cancer in Asia is high and there is an increasing trend in the Asian population. 1 , 2 Long-course preoperative radiotherapy of 1.8 to 2.0 Gy in 25 to 28 fractions with concurrent chemotherapy has been widely practiced in the last 15 years and still proves to be superior to the short-course radiotherapy in tumor control and recurrence reduction. 3 – 5 However, the large fractionation number of the long-course radiotherapy combined with the high rectal cancer incidences results in a heavy workload for the radiotherapy departments.

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