ArticleKorean journal of radiology2026
Prognostic Significance of Pretreatment ¹⁸F-FDG PET/CT Parameters in Patients With ER+/HER2- Metastatic Breast Cancer Treated With CDK4/6 Inhibitors Plus Endocrine Therapy.
Article in Korean journal of radiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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15 authors.
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Abstract
objectiveCyclin-dependent kinase 4/6 (CDK4/6) inhibitors combined with endocrine therapy (ET) constitute the standard systemic treatment for estrogen receptor-positive, human epidermal growth factor 2-negative (ER+/HER2-) metastatic breast cancer (MBC). However, treatment responses remain heterogeneous, highlighting the need for reliable prognostic markers. This study aimed to evaluate the prognostic significance of ¹⁸F-fluorodeoxyglucose (FDG) PET/CT findings in this setting. MATERIALS AND
methodsThis retrospective single-center cohort study included patients with ER+/HER2- MBC who underwent ¹⁸F-FDG PET/CT before initiating CDK4/6 inhibitors plus ET between 2018 and 2023. Maximum standardized uptake value (SUVmax), whole-body metabolic tumor volume (MTV), and total lesion glycolysis (TLG) were measured. Progression-free survival (PFS) and overall survival (OS) were evaluated as the primary and secondary outcomes, respectively, using multivariable Cox models. PET parameters (SUVmax, MTV, and TLG) were analyzed as both continuous and dichotomized variables based on median values, adjusting for relevant clinical covariates.
resultsAmong the 374 patients, 82 (21.9%) presented with de novo metastatic disease, and 357 (95.5%) received CDK4/6 inhibitors as first-line therapy. In multivariable Cox analysis, all continuous PET parameters were independently associated with PFS (adjusted hazard ratio for SUVmax 1.05 [95% confidence interval 1.02-1.08]; log-transformed MTV 1.16 [1.08-1.25]; and log-transformed TLG 1.14 [1.07-1.23]) and OS (SUVmax 1.08 [1.04-1.11]; log-transformed MTV 1.24 [1.12-1.38]; and log-transformed TLG 1.22 [1.11-1.34]) with all
conclusionPretreatment ¹⁸F-FDG PET/CT parameters are independent prognostic markers in patients with ER+/HER2- MBC receiving CDK4/6 inhibitors with ET, supporting their potential utility in risk stratification.
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