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STROBE study flowchart and the number of individuals at each stage of the study. 1, We only included those treated (class 1–2) by any single institution to ensure data consistency. 2, The seventh American Joint Committee on Cancer staging clinical stage 3A and 3B. 3, 50–70 Gy in 1.8–2 Gy/fraction, within ± 10% in dose and treatment duration. 4, Without missing information in the TCR and death registry regarding survival status, and cause of death.
