The Real-world Outcomes of Patients With Advanced Invasive Lobular Carcinoma of the Breast Compared With Invasive Ductal Carcinoma: A Review at a Single Institution

Background: The real-world outcomes of patients with advanced invasive lobular carcinoma (ILC) of the breast are unclear because of its rarity. Patients and Methods: We identified 435 patients with estrogen receptor-positive (ER⁺), HER2-negative (HER2⁻) advanced breast cancer treated at our Institute between 2002 and 2019, and analyzed their outcomes retrospectively. Results: We identified 29 patients with advanced ILC. At...