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Pregnancy may increase the risk of papillary thyroid microcarcinoma (PTMC) enlargement. Careful monitoring of PTMC is recommended during pregnancy, though prognosis is likely unaffected.

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Area of Science:

  • Endocrinology
  • Oncology
  • Reproductive Medicine

Background:

  • Papillary thyroid microcarcinoma (PTMC) is a low-risk thyroid cancer.
  • PTMC rarely progresses, making observation a suitable strategy for many patients.
  • Human chorionic gonadotropin during pregnancy has weak thyroid-stimulating properties.

Purpose of the Study:

  • To evaluate the impact of pregnancy on the growth of papillary thyroid microcarcinoma.
  • To assess if pregnancy influences PTMC progression in women of childbearing age.

Main Methods:

  • A cohort of 9 pregnant PTMC patients was compared to 27 age-matched non-pregnant controls.
  • Tumor enlargement was defined as a 3 mm or greater increase in tumor diameter.
  • Serum thyroglobulin, thyrotropin levels, and estrogen receptor status were analyzed.

Main Results:

  • PTMC enlargement occurred in 44.4% of pregnant patients versus 11.1% in controls (p=0.0497).
  • No correlation was found between pregnancy, tumor size, and serum thyroid hormone levels.
  • Estrogen receptors were not detected in the tumors of surgically treated patients.

Conclusions:

  • Pregnancy may be associated with an increased risk of PTMC enlargement.
  • Close surveillance of PTMC is advised during pregnancy.
  • PTMC enlargement during pregnancy is unlikely to negatively impact patient prognosis.