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The methodology is widely used in drug target selection, risk assessment, understanding disease biology, and characterizing histopathological findings in nonclinical studies. The Scientific and Regulatory Policy Committee of the Society of Toxicologic Pathology formed a working group to compile essential information on chromogenic IHC assays not performed in compliance with Good Laboratory Practice (GLP) from nonclinical studies, using relevant literature and the Working Group members\u2019 collective expertise. In this \u201cPoints to Consider\u201d article, emphasis is placed on factors influencing IHC data quality, including sample selection, general assay considerations, data generation and interpretation, and effective reporting. The Working Group members deliberated extensively on pertinent topics, aiming to provide specific and practical guidance for pathologists, histologists, and allied scientists engaged in chromogenic IHC assays. 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