Thyroid Dose and Hypothyroidism in Breast Cancer Patients
Author Information
Author(s): Johansen S, Reinertsen KV, Knutstad K, Olsen DR, Fosså SD
Primary Institution: Oslo University Hospital-Radiumhospitalet
Hypothesis
The development of post-treatment hypothyroidism is related to the dose distribution within the thyroid gland in breast cancer patients treated with radiotherapy.
Conclusion
Patients with smaller thyroid glands after radiotherapy for breast cancer are at a higher risk of developing hypothyroidism.
Supporting Evidence
- The median thyroid dose was about 30 Gy for included patients.
- The volume of the thyroid gland receiving < 30 Gy in Controls was almost 2.5 times greater than in Cases.
- No statistically significant differences were found between the groups for various dose levels.
Takeaway
If a breast cancer patient has a small thyroid gland, they might have trouble making enough thyroid hormone after radiation treatment, which can lead to hypothyroidism.
Methodology
The study compared thyroid dose volume histograms in breast cancer patients with and without post-radiotherapy hypothyroidism.
Potential Biases
Potential bias in self-reported hypothyroidism status.
Limitations
The measurement of thyroid gland volume was challenging and may have introduced errors.
Participant Demographics
32 women with breast cancer, aged 44-75, treated with radiotherapy.
Statistical Information
P-Value
0.003
Confidence Interval
[22Gy-42Gy]
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website