Factors associated with olaparib toxicity remain unknown in ovarian cancer patients. The large inter-individual variability in olaparib pharmacokinetics could contribute to the onset of early significant adverse events (SAE). We aimed to retrospectively analyze the pharmacokinetic/pharmacodynamic relationship for toxicity in ovarian cancer patients from “real life” data. The clinical endpoint was the onset of SAE (grade III/IV toxicity or dose reduction/discontinuation). Plasma olaparib concentration was assayed using liquid chromatography at any time over the dosing interval. Trough concentrations (CminPred) were estimated using a population pharmacokinetic model. The association between toxicity and clinical characteristics or CminPred was assessed by logistic regression and non-parametric statistical tests. Twenty-seven patients were included, among whom 13 (48%) experienced SAE during the first six months of treatment. Olaparib CminPred was the only covariate significantly associated with increased risk of SAE onset (odds ratio = 1.31, 95%CI = [1.10; 1.57], for each additional 1000 ng/mL). The ROC curve identified a threshold of CminPred = 2500 ng/mL for prediction of SAE onset (sensitivity/specificity 0.62 and 1.00, respectively). This study highlights a significant association between olaparib plasma exposure and SAE onset and identified the threshold of 2500 ng/mL trough concentration as potentially useful to guide dose adjustment in ovarian cancer patients.

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Background Treatment options for penile squamous cell carcinoma (PeCa) are limited. We sought to investigate clinical outcomes and safety profiles of patients with PeCa receiving immune checkpoint inhibitors (ICIs). Methods This retrospective study included patients with locally advanced or metastatic PeCa receiving ICIs during 2015-2022 across 24 centers in the United States, Europe, and Asia. Overall survival (OS) and progression-free survival (PFS) were estimated by the Kaplan-Meier method. Objective response rates (ORRs) were determined per RECIST 1.1 criteria. Treatment-related adverse events (trAEs) were graded per the Common Terminology Criteria for Adverse Events v5.0. Two-sided statistical tests were used for comparisons. Results Among 92 patients, 8 were Asian (8.7%), 6 (6.5%) were Black, and 24 (29%) were Hispanic/Latinx. Median age was 62 (inter-quartile range: 53 to 70) years. 83 (90%) had metastatic PeCa, and 74 (80%) received ≥2nd line treatment. Most patients received pembrolizumab monotherapy (n = 26, 28%), combination nivolumab/ipilimumab +/- multi-targeted tyrosine kinase inhibitors (n = 23, 25%), nivolumab (n = 16, 17%) or cemiplimab (n = 15, 16%) monotherapies. Median OS and PFS were 9.8 (95% CI: 7.7-12.8) months and 3.2 (95% CI: 2.5-4.2) months, respectively. ORR was 13% (n = 11/85) in the overall cohort and 35% (n = 7/20) in patients with lymph node-only metastases. Visceral metastases, ECOG performance status ≥1, and higher Neutrophil/Lymphocyte ratio (NLR) were associated with worse OS. TrAEs occurred in 29% (n = 27) and 9.8% (n = 9) were grade ≥3. Conclusions ICIs are active in a subset of patients with PeCa. Future translational studies are warranted to identify patients more likely to derive clinical benefit from ICIs.

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