ArticleWorld journal of oncology2025
Clinicopathological Features of HER2 Expressing Lobular Carcinoma of Breast.
Article in World journal of oncology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Invasive lobular carcinoma (ILC) accounts for approximately 10% of invasive breast carcinomas and is the most common special subtype. Most ILCs express estrogen receptors (ERs) and progesterone receptors (PRs) but typically lack ERBB2 (human epidermal growth factor receptor 2 (HER2)) overexpression. HER2-positive ILC is rare, understudied, and often linked to aggressive clinical and histopathologic features. This study aimed to examine the clinicopathologic characteristics of HER2-positive ILC to ensure proper classification and management. Methods: A retrospective review was conducted on 48 cases, including 28 HER2-positive ILC and 20 pleomorphic invasive lobular carcinoma (p-ILC) cases without HER2 overexpression. Histological features assessed included nuclear pleomorphism, signet ring cell morphology, and apocrine features. Hormone receptor status and clinical outcomes were also analyzed. Results: All HER2-positive ILC cases exhibited at least one pleomorphic histological feature. Hormone receptor positivity was lower in HER2-positive ILC compared to p-ILC without HER2 overexpression. However, overall survival did not significantly differ between the two groups. Conclusion: HER2 overexpression in ILC is frequently associated with pleomorphic features. p-ILC, regardless of HER2 status, portends a worse prognosis. Identifying these features in HER2-positive ILC and classifying them as pleomorphic lobular carcinoma, a more aggressive ILC variant, is crucial for closer patient follow-up.
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