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INTRODUCTION: Breast cancer (BC) is the most commonly diagnosed cancer in women. This study evaluated the clinical outcomes and prognostic factors associated with disease-free survival (DFS) and overall survival (OS) in a cohort of patients diagnosed with hormone receptor-positive non-metastatic BC managed with adjuvant hormone therapy. METHODS: An observational, analytical, historical cohort study was conducted. DFS and OS rates were estimated, Kaplan-Meier survival functions were calculated, and Cox models were developed to assess the association between time to event (all-cause mortality or relapse) and hormone therapy exposure with a set of established variables. RESULTS: Inclusion criteria were met by 685 patients; the mean age at diagnosis was 58 years (SD=11.9 years). The most commonly used drug was tamoxifen for five years in 241 (35.7%) patients; 470 (69.6%) patients received initial therapy, 112 (16.5%) underwent switch therapy, and 93 (13.8%) had extended therapy. The factors associated with better rates of DFS and OS were early clinical stage (p=0.00), luminal A and luminal B Her2-positive biological subtypes (p=0.00), and adherence to adjuvant hormone therapy (p=0.001). Mortality rate was 0.77 deaths per 100 patients/year (95% CI, 0.51-1.2). CONCLUSION: This cohort demonstrated that adjuvant hormone therapy improves DFS and OS rates in locally advanced tumors. The main factor for reducing disease progression in this cohort was adequate adherence to treatment.

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Los xantomas intraóseos son lesiones líticas expansibles compuestas por histiocitos cargados de lípidos. Usualmente son secundarios a enfermedades endocrinas, metabólicas o como hallazgo incidental ante una fractura patológica no asociada a enfermedades sistémicas. En este último caso se denomina xantoma intraóseo primario. Describimos el caso de una mujer de 32 años con clínica de 4 meses de evolución de dolor en cadera derecha, con imágenes y biopsia de la zona intertrocantérica derecha, compatible con un quiste óseo simple residual. Se realizó tratamiento intralesional con relleno de matriz ósea desmineralizada, aloinjerto de peroné segmentario y osteosíntesis con patología quirúrgica que reportó xantogranuloma óseo en paciente con niveles de colesterol normal con adecuado control de la enfermedad, consolidación y recuperación funcional. Presentamos este reporte dada la baja incidencia de dicha patología y se discuten los diagnósticos diferenciales.

Intraosseous xanthomas are expandable lytic lesions composed of lipid-laden histiocytes. They are usually secondary to endocrine or metabolic diseases or as an incidental finding in a pathological fracture not associated with systemic diseases. In the latter case it is called primary intraosseous xanthoma. We describe the case of a 32-year-old woman with a 4-month history of pain in the right hip, with images and biopsy of the right intertrochanteric area, compatible with a residual simple bone cyst. Intralesional treatment was performed with demineralized bone matrix filling, segmental fibula allograft and osteosynthesis with surgical pathology that reported bone xanthogranuloma in a patient with normal cholesterol levels with adequate disease control, consolidation and functional recovery. We present this report given the low incidence of said pathology and the differential diagnoses are discussed.