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(a), The stromal infiltration of numerous lymphocytes could be confirmed; (b), Evaluation by fluorescence microscopy. The white portion is the stroma and the blue portion represents lymphocytes. Those with >50% TIL were in the high TIL group; (c), Interstitial lymphocytic infiltration was uncommon; (d), Evaluation by fluorescence microscopy. Those with <10% TIL were in the low TIL group (all were observed under 400× magnification). TIL, tumor-infiltrating lymphocyte
