Fig. 1

Representative pictures of intratumoral inflammatory cell infiltration by hematoxylin and eosin staining. Low density of inflammatory cell infiltration in the primary tumor (a: × 100, b: × 400). High density of inflammatory cell infiltration in the primary tumor (c: × 100, d: × 400). Low-density inflammatory cell infiltration in the metastatic tumor (e: × 100, f: × 400). High-density inflammatory cell infiltration in the metastatic tumor (g: × 100, h: × 400)