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The NOTCH1 gene and its signaling pathway play a critical role in the oncogenesis and progression of various carcinomas through complex cellular and molecular mechanisms. This integrative literature review examines 21 selected studies across multiple carcinoma types, including head and neck, prostate, penis, breast, and hepatocellular carcinomas, to elucidate the functional impact of notch1 alterations on tumor behavior and clinical outcomes. NOTCH1 functions as a context-dependent regulator, acting either as an oncogene or tumor suppressor according to cellular environment and molecular context. Aberrations in notch1 signaling influence cell proliferation, differentiation, apoptosis, and angiogenesis, thereby contributing to cancer initiation and progression. Despite some variability in findings, the majority of studies indicate that notch1-related molecular changes have significant implications for prognosis and potential therapeutic targeting. This review highlights the importance of understanding notch1 signaling pathways in the cellular and molecular biology of carcinomas, aiming to pave the way for novel diagnostic and treatment strategies.