Patient-reported outcomes (PRO) from the phase 2 CodeBreaK 100 trial evaluating sotorasib in KRAS p.G12C mutated non-small cell lung cancer (NSCLC).

Abstract

9057 Background: In the registrational phase 2 CodeBreaK 100 trial, sotorasib demonstrated a response rate of 37.1% with median duration of 10.0 months, a median progression-free survival of 6.8 months, and a tolerable safety profile in patients with pretreated KRAS p.G12C mutated NSCLC. Patients received a median of 2 prior lines of therapy. Here, we report PRO measures of health-related quality of life (QoL), physical functioning, and key lung cancer symptoms from this trial. Methods: Eligible patients had KRAS p.G12C mutated advanced NSCLC and received prior standard therapies. Sotorasib was given at an oral daily dose of 960 mg with 21-day treatment cycles until disease progression. Disease-related symptoms and health-related QoL were evaluated as exploratory endpoints on day 1 of each cycle from baseline to discontinuation, using the European Organization for Research and Treatment of Cancer Quality-of-life Questionnaire Core 30 (EORTC QLQ-C30) and its lung cancer module, EORTC QLQ-LC13. The single item, 5-point scale GP5, of the Functional Assessment of Cancer Therapy-General version was used to evaluate the impact of side effects. Predefined analyses included change from baseline using descriptive statistics and mixed model for repeated measures for global health status/QoL, physical functioning, and key lung cancer symptoms of cough, dyspnea and chest pain. Results: Of 126 patients enrolled, compliance rates for each of the questionnaires were high throughout the study ( > 70%). Data up to cycle 11 (where n > 20) are presented. EORTC QLQ-C30 global health status/QoL and physical functioning were maintained over time (least-square mean changes ranged from -3.5 to 0.2 and 0.1 to 3.9, respectively). EORTC QLQ-C30 symptoms of fatigue, nausea/vomiting, pain, dyspnea, insomnia, appetite loss, and constipation were stable or improved. Similarly, key lung cancer-related symptoms, as measured by EORTC QLQ-LC13, remained stable or improved from baseline, with the greatest least-square mean change of -11.2 (95% Cl: -16.2, -6.1) for cough, -4.9 (95% Cl: -10.3, 0.4) for chest pain, and -3.4 (95% Cl: -7.8, 1.0) for dyspnea. Most patients reported on the GP5 that they were “not at all” (54.2%-79.2%) or “a little bit” (8.3%-33.3%) bothered by side effects from sotorasib, with 0%-7.4% reporting being bothered as “quite a bit” and 0% as “very much”. Conclusions: In patients from the single-arm phase 2 trial of sotorasib, PRO measures suggested maintenance or improvement of global health status/QoL, physical functioning, and the severity of key lung cancer-related symptoms, including cough, dyspnea, and chest pain. Self-reported side effect bother was minimal. These data, together with the encouraging efficacy and safety profiles, strongly support the use of sotorasib in this population. Clinical trial information: NCT03600883.