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• W3207075536 abstract "ABSTRACT Purpose Quantitative, multiplexed imaging is revealing complex spatial relationships between phenotypically diverse tumor infiltrating leukocyte populations and their prognostic implications. The underlying mechanisms and tissue structures that determine leukocyte distribution within and around tumor nests, however, remain poorly understood. While presumed players in metastatic dissemination, new preclinical data demonstrates that blood and lymphatic vessels (lymphovasculature) also dictate leukocyte trafficking within tumor microenvironments and thereby impact anti-tumor immunity. Here we interrogate these relationships in primary human cutaneous melanoma. Experimental Design We established a quantitative, multiplexed imaging platform to simultaneously detect immune infiltrates and tumor-associated vessels in formalin-fixed paraffin embedded patient samples. We performed a discovery, retrospective analysis of 28 treatment-naïve, primary cutaneous melanomas. Results Here we find that the lymphvasculature and immune infiltrate is heterogenous across patients in treatment naïve, primary melanoma. We categorized five lymphovascular subtypes that differ by functionality and morphology and mapped their localization in and around primary tumors. Interestingly, the localization of specific vessel subtypes, but not overall vessel density, significantly associated with the presence of lymphoid aggregates, regional progression, and intratumoral T cell infiltrates. Conclusions We describe a quantitative platform to enable simultaneous lymphovascular and immune infiltrate analysis and map their spatial relationships in primary melanoma. Our data indicate that tumor-associated vessels exist in different states and that their localization may determine potential for tumor cell exit (metastasis) or leukocyte trafficking (immune response). This platform will support future efforts to map tumor-associated lymphovascular evolution across stage, assess its prognostic value, and stratify patients for adjuvant therapy. TRANSLATIONAL RELEVANCE This report describes a quantitative, image-based method to investigate the relationship between the tumor-associated lymphovasculature and immune landscape in treatment naïve, primary human melanoma. The research shows that melanoma-associated blood and lymphatic vessels display context-dependent phenotypes that associate both with the risk of regional progression and immune infiltration. These findings indicate that stromal/vascular heterogeneity may underlie regional differences in immunogenicity and thus present opportunities for future biomarker development and therapeutic intervention." @default.
• W3207075536 created "2021-10-25" @default.
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• W3207075536 date "2021-10-09" @default.
• W3207075536 modified "2023-09-27" @default.
• W3207075536 title "Quantitative multiplex immunohistochemistry reveals inter-patient lymphovascular and immune heterogeneity in primary cutaneous melanoma" @default.
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• W3207075536 doi "https://doi.org/10.1101/2021.10.08.463675" @default.
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