Clinicopathological features included age, sex, tumor location (tumor distance from the anal verge), adjuvant chemotherapy, tumor grade, tumor stage, vascular invasion and perineural invasion. As systemic inflammation markers, the blood-based NLR was calculated based on pre-operative data. Blood-based NLR = blood-based total neutrophil count (109/L)/ blood-based total lymphocyte count (109/L). Following previously established procedures6 (link), we meticulously reviewed all hematoxylin and eosin-stained sections, selected representative sections, and cut sections into 4-μm-thick slices. The MoticEasyScan Infinity was used to scan all hematoxylin and eosin-stained sections, and Motic DSAssistant was used to analyze.
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