Abstract
Background
Merkel cell carcinoma (MCC) is a rare cutaneous malignancy for which factors predictive of disease-specific survival (DSS) are poorly defined.
Methods
Patients from six centers (2005–2020) with clinical stage I–II MCC who underwent sentinel lymph node (SLN) biopsy were included. Factors associated with DSS were identified using competing-risks regression analysis. Risk-score modeling was established using competing-risks regression on a training dataset and internally validated by point assignment to variables.
Results
Of 604 patients, 474 (78.5%) and 128 (21.2%) patients had clinical stage I and II disease, respectively, and 189 (31.3%) had SLN metastases. The 5-year DSS rate was 81.8% with a median follow-up of 31 months. Prognostic factors associated with worse DSS included increasing age (hazard ratio [HR] 1.03, p = 0.046), male sex (HR 3.21, p = 0.021), immune compromise (HR 2.46, p = 0.013), presence of microsatellites (HR 2.65, p = 0.041), and regional nodal involvement (1 node: HR 2.48, p = 0.039; ≥2 nodes: HR 2.95, p = 0.026). An internally validated, risk-score model incorporating all of these factors was developed with good performance (AUC 0.738). Patients with ≤ 4.00 and > 4.00 points had 5-year DSS rates of 89.4% and 67.2%, respectively. Five-year DSS for pathologic stage I/II patients with > 4.00 points (n = 49) was 79.8% and for pathologic stage III patients with ≤ 4.00 points (n = 62) was 90.3%.
Conclusions
A risk-score model, including patient and tumor factors, based on DSS improves prognostic assessment of patients with clinically localized MCC. This may inform surveillance strategies and patient selection for adjuvant therapy trials.
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The authors did not receive funding for the completion of this work. All authors have read and acknowledged the contents of this manuscript. C. Slingluff reports research funding to his University from Merck, Celldex, and GlaxoSmithKline; research support in kind to his University from Theraclion and 3M; Scientific Advisory Board role with Immatics (prior), and Curevac (planned); PI role for Polynoma with compensation to his University; and patent royalties as co-inventor of peptides for use in cancer vaccines (patents held by the UVA Licensing and Ventures Group), all outside the submitted work.
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MBF reports advisory board participation with Merck, Bristol Myers Squibb, Novartis, Array, Pulse Bioscience, and Sanofi, all outside the submitted work. G.M. Beasley reports relevant financial activities outside the submitted work as a member of the 2020 Regeneron Sanofi advisory board. V. Sondak reports personal fees from Array, Bristol Myers Squibb, Genentech, Merck, Novartis, Pfizer, Regeneron, Replimune, and research funding to his institution from Neogene Therapeutics, outside the submitted work. J.S. Zager reports advisory board participation with Merck, Amgen, and Sanofi Regeneron; speakers bureau participation with Array Biopharma and Sun Pharma; and research work with Amgen, Provectus, Castle Biosciences, and Delcath Systems, all outside the submitted work.
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Shannon, A.B., Straker, R.J., Carr, M.J. et al. An Internally Validated Prognostic Risk-Score Model for Disease-Specific Survival in Clinical Stage I and II Merkel Cell Carcinoma. Ann Surg Oncol 29, 7033–7044 (2022). https://doi.org/10.1245/s10434-022-12201-z
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DOI: https://doi.org/10.1245/s10434-022-12201-z