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• W4313455162 abstract "Olaparib is the poly-[Adenosine diphosphate ribose (ADP-ribose)] polymerase inhibitor (PARPI) used in maintenance therapy of patients with platinum-sensitive ovarian cancer with mutations in breast cancer genes 1/2 (BRCA1/2). Oncologists still do not have recommendations of treatment depending on efficient plasma concentrations of the PARP inhibitor. The aim of the study was the assessment of plasma trough concentrations of olaparib at steady state (Ctrough) in ovarian cancer patients. The severity of olaparib adverse effects (AEs) was noted.The retrospective study involved 33 patients [mean standard deviation (SD)]; age 57.0 (8.4) years; weight 68.7 (13.7) kg; and body mass index (BMI) 26.4 (4.9) kg/m2, with ovarian cancer treated with olaparib (tablets in dose 300 mg/12 h, 250 mg/12 h, 200 mg/12 h or capsules 400 mg/12 h, 200 mg/12 h, 100 mg/12 h). Plasma drug levels were measured by HPLC-UV method (λ = 254 nm; Symmetry C8 column; gradient flow). The severity of olaparib AEs was assessed by Common Terminology Criteria for Adverse Events (CTCAE) v5.0 scale. Drug interactions were analyzed.In total, 130 measurements (n) of Ctrough were determined in 33 patients (median sample frequency per patient was 4). The olaparib Ctrough in patients with AEs was 87.840-7,213.262 ng/mL [coefficient of variation (CV) = 91%], in patients without AEs 48.021-7,073.350 ng/mL (CV = 88%). AEs were the following: fatigue (modest, n = 4, severe, n = 2), anemia (grade G1 n = 66, G2 n = 6, G3 n = 3), neutropenia (grade G1 n = 15, G2 n = 4), prediabetes (n = 1). There was a correlation between Ctrough and olaparib-induced fatigue (p = 0.0015). The lower values of dose-adjusted olaparib concentrations (p = 0.0121) and dose/kg-adjusted olaparib concentrations (p = 0.0389) were correlated with higher grade of neutropenia.There was a correlation between Ctrough, expressed as ng/ml, ng/ml/mg or ng/ml/mg/kg, and fatigue degree, but not anemia. Patients with neutropenia had statistically significant lower plasma concentrations of olaparib." @default.
• W4313455162 created "2023-01-06" @default.
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• W4313455162 date "2022-12-01" @default.
• W4313455162 modified "2023-10-16" @default.
• W4313455162 title "The use of Ctrough for the therapeutic drug monitoring of olaparib in patients with ovarian cancer." @default.
• W4313455162 doi "https://doi.org/10.26355/eurrev_202212_30694" @default.
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