Abstract
Little is known regarding the association of non-lactational mastitis women with breast cancer risk. This population-based cohort study examined the breast cancer risk in women with non-lactational mastitis. We identified 3,091 women with non-lactational mastitis between 2000 and 2011 using the Taiwan National Health Insurance Research Database. We performed 1:4 propensity score matching by age, socioeconomic status and comorbidities and identified 12,364 women without non-lactational mastitis. The mean age of women with non-lactational mastitis was 37.9 years; these women had a higher breast cancer risk than the comparison group (adjusted hazard ratio = 1.94, 95% confidence interval: 1.30–2.90). The incidence rates of breast cancer in women with non-lactational mastitis and the comparison group were 14.79 and 7.57 per 10,000 person-years, respectively. Furthermore, non-lactational mastitis was a risk factor for breast cancer in women aged <50 years, women with lower socioeconomic status and women with hormonal medication (p < 0.05). Women who had more episodes of non-lactational mastitis had a higher risk of developing a breast cancer. Thus, the risk of breast cancer in women with non-lactational mastitis is significantly higher than those without non-lactational mastitis.
Highlights
Little is known regarding the association of non-lactational mastitis women with breast cancer risk
Data regarding registration files and medical claims for all beneficiaries are linked through encrypted identification numbers in the National Health Insurance Research Database (NHIRD)
socioeconomic status (SES) and comorbidities, the standardised mean difference (SMD) between the non-lactational mastitis and comparison groups did not significantly differ (SMD
Summary
Little is known regarding the association of non-lactational mastitis women with breast cancer risk. The incidence rates of breast cancer in women with non-lactational mastitis and the comparison group were 14.79 and 7.57 per 10,000 person-years, respectively. Women who had more episodes of non-lactational mastitis had a higher risk of developing a breast cancer. Non-lactational mastitis is a breast inflammatory condition in non-breastfeeding women. Little is known regarding the risk of breast cancer in women with non-lactational mastitis. The aim of this population-based cohort study was to examine the breast cancer risk in women with non-lactational mastitis using a national database of Taiwan. We evaluated the risk of breast cancer among women with different numbers of episodes of non-lactational mastitis
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