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Association between breast cancer and thyroid cancer: A study based on 13 978 patients with breast cancer

Nai-Si Huang^1,2, Xing-Xing Chen^2,3, Wen-Jun Wei^1,2

¹Department of Head and Neck Surgery, Fudan University Shanghai Cancer Center, Shanghai, China.

Cancer Medicine

|November 28, 2018

Abstract

Background:

Thyroid cancer (TC) is one of the most commonly seen secondary malignancy in breast cancer (BC) survivors.

Materials And Methods:

A retrospective study was conducted in BC patients in our center from 1999 to 2013. Patients were divided into BC-TC group and BC-alone group.

Results:

In total, 13 978 BC patients were identified, among whom 247 (1.8%) had TC. The standardized incidence ratio (SIR) of TC was 4.48 compared with Chinese females, and up to 98.0% of cases were thyroid papillary carcinomas. A family history of malignancy was the only independent risk factor (odds ratio = 1.457, P = 0.025) for development of TC in patients with BC. We also identified inferior survival in patients with synchronous versus metachronous BC-TC (P = 0.016). Synchronous BC-TC (risk ratio = 5.597, P = 0.018) was an independent prognostic factor for inferior RFS.

Conclusions:

We observed high co-occurrence of TC in patients with BC. There might be different mechanisms behind synchronous and metachronous BC-TC.

Keywords:

breast cancer prognosis second primary malignancy synchronous cancer thyroid cancer

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