{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T22:44:04Z","timestamp":1790549044733,"version":"4.1.0"},"reference-count":46,"publisher":"American Medical Association (AMA)","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JAMA Netw Open"],"abstract":"<jats:sec id=\"ab-zoi250486-4\"><jats:title>Importance<\/jats:title><jats:p>Racial and ethnic disparities in pathologic complete response (pCR) and overall survival (OS) have been reported in patients with triple-negative breast cancer (TNBC). In addition to socioeconomic factors and access to care, differences in tumor biology may affect outcomes. The association of <jats:italic>ERBB2-<\/jats:italic>low expression with outcomes in patients with TNBC has been minimally explored, including studies evaluating outcomes based on race and ethnicity.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi250486-5\"><jats:title>Objective<\/jats:title><jats:p>To investigate whether <jats:italic>ERBB2-<\/jats:italic>low expression among patients with TNBC varies by race and ethnicity and is associated with pCR and OS.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi250486-6\"><jats:title>Design, Setting, and Participants<\/jats:title><jats:p>This retrospective cohort study used the National Cancer Database, a national hospital-based tumor registry, from 2010 to 2019. Participants included adult female patients with stages I to III TNBC treated with neoadjuvant chemotherapy followed by surgery. Tumors with immunohistochemistry scores of 1+ or 2+, in situ hybridization nonamplified, were classified as <jats:italic>ERBB2-<\/jats:italic>low; those with immunohistochemistry scores of 0, as <jats:italic>ERBB2<\/jats:italic>-zero. Primary analysis was conducted from September 18 to October 18, 2023.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi250486-7\"><jats:title>Main Outcomes and Measures<\/jats:title><jats:p>Rates of <jats:italic>ERBB2<\/jats:italic>-low vs <jats:italic>ERBB2<\/jats:italic>-zero TNBC by race and ethnicity and pCR and OS by race and ethnicity and by <jats:italic>ERBB2<\/jats:italic> status.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi250486-8\"><jats:title>Results<\/jats:title><jats:p>Overall, 31\u202f888 patients with TNBC were identified (median age, 53 [IQR, 44-61] years). Of those, 1078 patients (3.4%) were Asian; 7642 (24.0%), Black; 2578 (8.1%), Hispanic; 20\u202f264 (63.5%), White; and 326 (1.0%), other. Over half of the study population (16 332 [51.2%]) displayed <jats:italic>ERBB2<\/jats:italic>-low expression and 15 556 (48.8%), <jats:italic>ERBB2<\/jats:italic>-zero expression. Patients with <jats:italic>ERBB2<\/jats:italic>-low expression demonstrated lower rates of pCR than those with <jats:italic>ERBB2<\/jats:italic>-zero expression (4675 [28.6%] vs 4787 [30.8%]; <jats:italic>P<\/jats:italic>\u2009&amp;amp;lt;\u2009.001); <jats:italic>ERBB2<\/jats:italic>-low expression was associated with lower odds of pCR after adjustment for patient, socioeconomic, and tumor variables (odds ratio, 0.93; 95% CI, 0.88-0.99; <jats:italic>P<\/jats:italic>\u2009=\u2009.01). When patients were stratified by race and ethnicity, Hispanic patients had higher rates of <jats:italic>ERBB2<\/jats:italic>-zero expression than <jats:italic>ERBB2<\/jats:italic>-low expression (1391 of 2578 [54.0%] vs 1187 of 2578 [46.0%]; <jats:italic>P<\/jats:italic>\u2009&amp;amp;lt;\u2009.001); no differences were noted among other racial and ethnic groups. Hispanic patients also had higher rates of pCR among those with <jats:italic>ERBB2<\/jats:italic>-low (Hispanic, 30.7%; Asian, 24.6%; Black, 29.5%; White, 27.1%) and <jats:italic>ERBB2<\/jats:italic>-zero (Hispanic, 33.2%; Asian, 32.1%; Black, 27.1%; White, 31.7%) TNBC. Non-Hispanic Asian patients had the highest 60-month OS among both those with <jats:italic>ERBB2<\/jats:italic>-zero (79%; 95% CI, 75%-83%) and <jats:italic>ERBB2<\/jats:italic>-low expression (84%; 95% CI, 80%-87%). Among Asian and White patients, <jats:italic>ERBB2<\/jats:italic>-low expression was associated with prolonged OS compared with <jats:italic>ERBB2<\/jats:italic>-zero expression (hazard ratios, 0.69 [95% CI, 0.50-0.95] [<jats:italic>P<\/jats:italic>\u2009=\u2009.02] and 0.85 [95% CI, 0.79-0.92] [<jats:italic>P<\/jats:italic>\u2009&amp;amp;lt;\u2009.001], respectively). Black patients had lower pCR and OS rates regardless of <jats:italic>ERBB2<\/jats:italic> status.<\/jats:p><\/jats:sec><jats:sec id=\"ab-zoi250486-9\"><jats:title>Conclusions and Relevance<\/jats:title><jats:p>In this cohort study of patients with TNBC, <jats:italic>ERBB2<\/jats:italic>-low expression and its association with clinical outcomes varied across racial and ethnic groups. These findings highlight the need for further research to understand the biological implications of <jats:italic>ERBB2<\/jats:italic>-low expression in diverse populations of patients with TNBC.<\/jats:p><\/jats:sec>","DOI":"10.1001\/jamanetworkopen.2025.14864","type":"journal-article","created":{"date-parts":[[2025,6,11]],"date-time":"2025-06-11T15:00:36Z","timestamp":1749654036000},"page":"e2514864","source":"Crossref","is-referenced-by-count":2,"title":["<i>ERBB2<\/i>-Low Expression by Race and Ethnicity Among Patients With Triple-Negative Breast Cancer"],"prefix":"10.1001","volume":"8","author":[{"given":"Astrid","family":"Botty van den Bruele","sequence":"first","affiliation":[{"name":"Department of Surgery, Duke University School of Medicine, Durham, North Carolina"},{"name":"Duke Cancer Institute, Duke University, Durham, North 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