Volume 23, Issue 9 pp. 1240-1247
ORIGINAL ARTICLE

Risk of malignancy in Korean patients with primary Sjögren's syndrome

Juyeon Kang

Juyeon Kang

Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, South Korea

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Hyoungyoung Kim

Hyoungyoung Kim

Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, South Korea

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Jinwook Kim

Jinwook Kim

Department of Statistics, Kyungpook National University, Deagu, South Korea

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Seongmi Choi

Seongmi Choi

Health Insurance Policy Research Institute, National Health Insurance Service, Wonju, South Korea

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Sun-Young Jung

Sun-Young Jung

College of Pharmacy, Chung-Ang University, Seoul, South Korea

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Eun Jin Jang

Eun Jin Jang

Department of Information Statistics, Andong National University, Andong, South Korea

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Soo-Kyung Cho

Soo-Kyung Cho

Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, South Korea

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Yoon-Kyoung Sung

Corresponding Author

Yoon-Kyoung Sung

Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, South Korea

Correspondence

Yoon-Kyoung Sung, Department of Rheumatology, Hanyang University Hospital for Rheumatic Diseases, Seoul, South Korea.

Email: [email protected]

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First published: 25 August 2020
Citations: 21

Abstract

Objectives

To evaluate the risks of overall and site-specific malignancies in Korean patients with primary Sjögren's syndrome (pSS).

Methods

Using the Korean nationwide healthcare claims database, we constructed a retrospective cohort for prevalent pSS aged over 50 years. After enrollment between January 2012 and December 2014, patients were followed until the development of any malignancy, or until December 2015. Crude incidence rates of malignancies of pSS patients were calculated, and their standardized incidence ratios (SIRs) for malignancies were calculated compared to those in knee osteoarthritis (OA) patients.

Results

A total of 6,359 pSS and 5,476,302 knee OA patients were included in this study. During follow-up (19,474 person-years [PYs]), 310 cases of solid malignancy (158.8/10,000 PYs) and 47 cases of hematologic malignancies (23.5/10,000 PYs) were observed in pSS patients. The risks of overall (SIR 1.30, 95% CI 1.16-1.43), solid (SIR 1.16, 95% CI 1.03-1.29), and hematologic malignancies (SIR 4.80, 95% CI 3.43-6.17) were increased in pSS patients. There was an elevated risk of site-specific malignancy in non-Hodgkin's lymphoma (NHL, SIR 6.45, 95% CI 4.05-8.83), multiple myeloma (SIR 4.88, 95% CI 2.00-7.76), and oropharynx (SIR 4.16, 95% CI 1.90-6.42). The risk of lung cancer was increased only in male pSS patients (2.50, 95% CI 1.02-3.99), while the risk of thyroid cancer was increased in female patients (1.44, 95% CI 1.04, 1.84).

Conclusion

In patients with pSS over age 50, the risk of solid cancers such as oropharynx, thyroid, and lung cancers is also increased in addition to NHL.

CONFLICTS OF INTEREST

All authors have declared no conflicts of interest.

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