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Updated: Jun 4, 2026

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Features predicting sentinel lymph node positivity in Merkel cell carcinoma.

Jennifer L Schwartz1, Kent A Griffith, Lori Lowe

  • 1University of Michigan Health System, 1910 Taubman Center, 1500 E Medical Center Dr, Ann Arbor, MI 48109-0314, USA. jennschw@med.umich.edu

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
|February 9, 2011
PubMed
Summary

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Merkel cell carcinoma (MCC) features like size, thickness, and growth pattern predict sentinel lymph node (SLN) positivity. All MCC patients without lymph node disease should consider SLN biopsy.

Area of Science:

  • Oncology
  • Dermatology
  • Surgical Pathology

Background:

  • Merkel cell carcinoma (MCC) is a rare but aggressive skin cancer.
  • Accurate staging is crucial for effective treatment planning.

Purpose of the Study:

  • To identify clinical and histologic features of primary MCC that correlate with sentinel lymph node (SLN) positivity.
  • To assess the probability of SLN metastasis in patients with MCC.

Main Methods:

  • Retrospective review of 95 patients with MCC who underwent SLN biopsy.
  • Analysis of clinical and histologic features including lesion size, tumor thickness, mitotic rate, and growth pattern.
  • Statistical analysis using univariate and multivariate models to predict SLN positivity.

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Main Results:

  • SLN positivity was significantly associated with larger lesion size, increased tumor thickness, higher mitotic rate, and infiltrative growth pattern.
  • Multivariate models incorporating growth pattern with either tumor thickness or mitotic rate effectively predicted SLN positivity.

Conclusions:

  • Clinical and histologic features, particularly tumor thickness and growth pattern, are significant predictors of SLN metastasis in MCC.
  • Given the consistent risk of SLN positivity across patient subgroups, sentinel lymph node biopsy is recommended for all MCC patients without clinical evidence of regional lymph node involvement.