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Papillary microcarcinoma.

Shiro Noguchi1, Hiroto Yamashita, Shinya Uchino

  • 1Noguchi Thyroid Clinic and Hospital Foundation, Beppu, Japan. admin@noguchi-med.or.jp

World Journal of Surgery
|February 12, 2008
PubMed
Summary
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Papillary microcarcinoma (PMC) shares characteristics with larger papillary cancers, with prognosis influenced by tumor size and patient age. Long-term surveillance is crucial due to potential recurrence over many years.

Area of Science:

  • Endocrinology
  • Oncology
  • Surgical Pathology

Background:

  • Papillary microcarcinoma (PMC) incidence is rising due to improved ultrasound-guided fine-needle aspiration cytology.
  • Understanding PMC's behavior is critical for effective patient management.

Purpose of the Study:

  • To analyze the clinical characteristics and long-term outcomes of papillary microcarcinoma.
  • To compare PMC prognosis with larger papillary cancers.
  • To identify factors influencing recurrence rates in PMC.

Main Methods:

  • Retrospective study of 2070 patients with PMC treated between 1966 and 1995.
  • Analysis of tumor size, patient age, extracapsular invasion, and recurrence rates.
  • Long-term follow-up to assess outcomes.

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Main Results:

  • PMC prognosis is generally good, similar to larger papillary cancers.
  • Tumor size and patient age significantly impact recurrence risk; larger tumors and older patients (>55 years) have higher recurrence rates.
  • Recurrence rates for larger PMC (6-10 mm) were 14% at 35 years, versus 3.3% for smaller tumors. Older patients had a 40% recurrence rate at 30 years compared to <10% for younger patients.
  • Extracapsular invasion increases recurrence risk. Most recurrences occur in the neck.

Conclusions:

  • Papillary microcarcinoma exhibits similar tumor characteristics and age-dependent recurrence patterns to larger papillary carcinomas.
  • Long-term surveillance, including annual neck ultrasound, is recommended after surgery for PMC due to the extended period of potential recurrence.