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Background: Cancer is one of the leading causes of pathological death in humans. Although CTHRC1 is a prooncogene highly expressed in a variety of tumor tissues, the specific biological mechanisms of CTHRC1 involvement in cancer development need to be elucidated. Methods: In the present study, nine online bioinformatics databases were employed to explore the potential prognostic and grading value of CTHRC1 in generalized cancer as well as its potential role in regulating tumor immunity. Results: Data from GEPIA2.0, Oncomine, TNMplot, Kaplan-Meier Plotter and TISIDB database had consistently demonstrated that CTHRC1 was associated with the expression, prognosis and typing in most cancer tissues. Cbioportal and SMART analysis revealed that genomic changes and methylation of CTHRC1 in most tumor tissues. Finally, Sangerbox and TIMER database analysis suggested that CTHRC1 was involved in the changes of immune cell components in tumor immune microenvironment, with certain heterogeneity. Meanwhile, CTHRC1 was correlated with TMB, MSI, neoantigen and tumor immune checkpoint, especially CD276. Conclusion: CTHRC1 had the potential as a prognostic and grading molecular marker for pan-cancer. And CTHRC1-related targeting agents may be a novel breakthrough in tumor immunotherapy.