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Thyroid disease and breast cancer

¹Dept. of Medicine & Therapeutics, University College, Dublin, Ireland.

Journal of Endocrinological Investigation

|May 1, 1993

Summary

This study found significantly larger thyroid volumes in breast cancer patients compared to controls, suggesting a direct relationship between thyroid disorders and breast cancer. Further research into common growth stimuli is warranted.

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Area of Science:

Endocrinology
Oncology
Medical Imaging

Background:

Existing literature shows inconsistent evidence linking thyroid disorders (hypothyroidism, hyperthyroidism, goiter) with breast cancer.
Previous studies often relied on palpation and originated from iodine-deficient regions, potentially limiting generalizability.

Purpose of the Study:

To investigate subtle changes in thyroid volume and anatomy in breast cancer patients using diagnostic ultrasound.
To explore the relationship between thyroid enlargement and breast cancer, independent of therapeutic interventions.

Main Methods:

Utilized diagnostic ultrasound to measure thyroid volume in 184 breast cancer patients and 150 age-matched controls.
Compared thyroid volumes and the prevalence of enlarged thyroid glands between patient and control groups.
Correlated thyroid enlargement with breast tumor staging and analyzed data from prospective and retrospective groups to exclude therapy effects.

Main Results:

Breast cancer patients exhibited significantly greater mean thyroid volume (20.4 ml) than controls (12.9 ml) (p < 0.01).
A higher percentage of breast cancer patients had enlarged thyroid glands (39.7%) compared to controls (8.6%) (p < 0.001).
A direct correlation was observed between thyroid enlargement and breast tumor staging, with no influence from prior therapies.

Conclusions:

The findings indicate a direct relationship between thyroid disorders and breast cancer.
A common growth stimulus may underlie the co-occurrence of these conditions.
Increased awareness of the association between thyroid enlargement and breast cancer is recommended for clinical practice.

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