ArticleInternational cancer conference journal2026
Unique pattern of endometrial invasion in gastric-type adenocarcinoma of the uterine cervix: a report of two cases.
Article in International cancer conference journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Gastric-type cervical adenocarcinoma (GAS), the most prevalent subtype of human papillomavirus (HPV)-independent cervical adenocarcinoma, is an aggressive malignancy with a poor prognosis. We herein present two cases of GAS with a unique endometrial infiltration pattern. Both cases were 37-year-old nulligravid women presenting with advanced GAS. A pathological examination revealed HPV-independent GAS that was positive for claudin 18 and negative for p16, with extensive invasion, including the myometrium and endometrium. Endometrial infiltration was characterized by a distinctive "symbiotic" pattern of invasion. In these areas, GAS glands intermingled with normal endometrial glands without disrupting the native architecture, and there was no distinct tumor border or stromal reaction. An immunohistochemical analysis revealed fewer CD8-positive tumor-infiltrating lymphocytes (TILs) around invasive GAS glands in the endometrium than in the normal endometrium and both the tumor center and invasive margin of the primary cervical lesion. These results are consistent with relative T-cell exclusion at the tumor-endometrium interface. This "symbiotic" invasion pattern differs from typical cervical adenocarcinoma, which forms distinct boundaries with desmoplastic stromal reactions. The observed pattern may contribute to the unexpectedly extensive spread of GAS frequently discovered only after surgical resection. The reduction in CD8-positive TILs density around invasive GAS glands indicates an immunologically "cold" tumor microenvironment that may contribute to treatment resistance. The present results provide novel insights into the pathology of GAS that may inform more effective diagnostic approaches and therapeutic strategies for this aggressive malignancy.
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