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Subgroup analysis by resection status, lymph node status and presence of distant metastasis: numbers at risk and overall survival
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R0, microscopic curative resection; R1, macroscopic curative resection; R2, macroscopic non-curative resection; M0, absence of distant metastasis; M1, presence of distant metastasis; N0, absence of lymph node metastasis; N1, presence of lymph node metastasis.
