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Emile, George; Penager, Sarah; Levy, Christelle; Johnson, Alison; Allouache, Djelila; Lequesne, Justine; Hrab, Ioana; Segura, Carine; Morel, Adeline; Gunzer, Katarina; Faveyrial, Audrey; Cherifi, Francois; Silva, Angelique Da
Oncology Letters, 01/2022, Letnik: 23, Številka: 1Journal Article
Cyclin-dependent-kinase 4-6 inhibitors (CDK4/6i) have improved the management of hormone receptor (HR).sup.+/human epidermal growth factor receptor (HER)2.sup.- metastatic breast cancer (mBC). Currently, there are no valid prognostic factors for response to CDK4/6i. Baseline lymphopenia is reported as a prognostic factor in several types of cancer. The present retrospective study aimed to evaluate the effect of baseline absolute lymphocyte count (ALC) on response to palbociclib. Progression-free survival (PFS) was the primary endpoint. Secondary endpoints were overall survival (OS), best response and safety. A total of 114 patients treated for mBC between 2016 and 2019 were included. Median baseline ALC was 1.4 g/l (range, 0.2-4.3 g/l). A total of 65 (57%) and 49 (43%) patients had baseline ALC values of <1.5 and greater than or equal to1.5 g/l, respectively. Patients with baseline lymphopenia exhibited significantly shorter PFS (6 vs. 10 months; P=0.004) and OS (20 vs. 33 months; P=0.02). ALC <1.5 g/l independently predicted worse survival, as indicated by multivariate analysis (P=0.04; hazard ratio, 1.76; 95% confidence interval, 1.02-3.02). Patients with baseline ALC <1.5 g/l had significantly less partial response (14 vs. 22%; P=0.016) and more disease progression (46 vs. 20%; P=0.016) than those with ALC greater than or equal to1.5 g/l. ALC is a strong and easy-to-use dosage with prognostic factor for patients with HR.sup.+/HER2.sup.- mBC treated with palbociclib and endocrine therapy. Lymphopenia may also be a predictive factor of early progression. These data need to be verified in a larger prospective study.
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