SHBG as a breast cancer risk biomarker in premenopausal women? Results from an individual patient's pooled analysis and a meta-analysis

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ID: 328389
2026
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Abstract
BACKGROUND: Low levels of sex hormone-binding globulin (SHBG) have been associated with increased breast cancer (BC) risk, particularly in postmenopausal women. Whether this association extends to premenopausal women remains uncertain. We therefore performed an individual-patient pooled analysis and a meta-analysis to evaluate SHBG's role as a biomarker across menopausal status. METHODS: The pooled analysis included women at increased BC risk enrolled in two low-dose tamoxifen trials. The meta-analysis included 11 independent published studies assessing the association of SHBG with BC risk in healthy premenopausal women. RESULTS: Among premenopausal women in the pooled high-risk cohort, SHBG levels above the lowest tertile were associated with a 40% lower hazard of subsequent breast cancer events (HR = 0.60; 95% CI, 0.38-0.96; p = 0.03). In the meta-analysis, comprising 35,167 premenopausal women and 2,302 BC events, the summary estimate in premenopausal women showed a non-significant 8% risk reduction (SOR=0.92; 95% CI, 0.78-1.09). On the other hand, among the seven studies reporting stratified data by menopausal status, postmenopausal women experienced a significant 28% risk reduction (SOR=0.77; 95% CI, 0.69-0.87), with no statistically significant heterogeneity by menopausal status (P = 0.28). CONCLUSIONS: In a selected high-risk population, higher baseline SHBG was associated with fewer subsequent BC events. However, the meta-analysis did not provide statistically significant evidence of an inverse association with breast cancer occurrence in premenopausal women. These findings suggest that SHBG may be a biomarker of subsequent breast events in high-risk settings but do not confirm its role as a risk biomarker in the general premenopausal population.
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openalex_W7212244200 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Davide Serrano, Roberta Rizzo, Harriet Johansson, Debora Macis, Valentina Aristarco, Aliana Guerrieri‐Gonzaga, Matteo Lazzeroni, Gaetano Aurilio, Alessio Carbone, Sofia Ramalho, Bernardo Bonanni, Andrea DeCensi, Sara Gandini
Journal JNCI Journal of the National Cancer Institute
Year 2026
DOI
10.1093/jnci/djag318
URL
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