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Methods| The University Hospitals Institutional Review Board determined this study to be exempt from review and waived the requirement for informed consent owing to use of deidentified data. We identified patients in the SEER registries who were diagnosed with CM from 2004 through 2017, excluding cases diagnosed at autopsy. For each case, we recorded numeric stage at diagnosis and TNM (tumor, node, metastasis) components provided by SEER based on the predominant staging system during the year of diagnosis. We compared the TNM components to 7 supplementary staging variables within the SEER registries, assessing for consistency as follows:(1) T stage: Breslow depth, ulceration, and mitoses;(2) N stage: regional node positivity and clinical lymph node status; and (3) M stage: distant metastasis. The seventh Combined Summary Stage variable allowed for comparison with all 3 TNM components …