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A method for assessing potential bias among cancer patients recorded as “dead of other causes”. Application to cases of intraocular melanoma

By applying the Cox regression model to 226 cases of intraocular melanoma, the authors detected a statistical association between tumor‐related measurements and 42 deaths that were recorded as due to causes other than melanoma within 10 years of follow‐up. This association may reflect a number of events, including errors in assignment of cause of death and confounding from any one of several sources.