What are the stages of Merkel cell carcinoma (MCC)?

Updated: Jan 18, 2019
  • Author: Arjun S Joshi, MD; Chief Editor: Arlen D Meyers, MD, MBA  more...
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The most commonly used clinical staging system, first described by Yiengpruksawan, is as follows:

  • Stage I - Isolated local disease

    • Stage Ia - Tumor ≤2 cm in diameter

    • Stage Ib - Tumor ≥2 cm in diameter

  • Stage II - Evidence of regional nodal spread

  • Stage III - Evidence of distant metastasis

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