The impact of viral load suppression, genotype, race, and other factors on the risk of late-stage liver-related events in patients with hepatitis C (HCV) has been assessed previously using data from small observational cohorts or clinical trials. Data from large real-world practice samples are needed to improve risk factor estimates for late-stage liver events and death in HCV.OBJECTIVE To describe the natural history of HCV in real-world clinical practice. DESIGN, SETTING, AND PARTICIPANTS Observational cohort study. Patients with a detectable viral load (>25 IU/mL) and a recorded baseline genotype were selected from the Veterans Affairs (VA) HCV clinical registry (CCR), which compiles electronic medical records data from 1999 to present.EXPOSURES Risk factors included genotype, race, age, sex, and time to achieving an observed undetected viral load. MAIN OUTCOMES AND MEASURESThe primary outcomes were time to death and time to a composite of liver-related clinical events. Secondary outcomes included the components of the composite clinical outcome. Outcomes were measured using a time-to-event format and were analyzed using Cox proportional hazards models.RESULTS A total of 28 769 of 360 857 unique HCV CCR patients met all study criteria. Only 24.3% of patients received treatment, and 16.4% of treated patients (4.0% of all patients) achieved an undetectable viral load. The unadjusted death rates were 6.8 (95% CI, 6.0-7.7) per 1000 person-years for patients who achieved viral load suppression vs 21.8 (95% CI, 21.5-22.2) deaths per 1000 person-years in patients who did not achieve this goal. Cox model results found that achieving viral suppression reduced risk of the composite clinical end point by 27% (hazard ratio [HR], 0.73 [95% CI, 0.66-0.82]) and the risk of death by 45% (HR, 0.55 [95% CI, 0.47-0.64]). Genotype 2 patients were at significantly lower risk, and genotype 3 patients were at higher risk for all study outcomes relative to genotype 1. Black patients were at lower risk for all liver events than white patients. CONCLUSION AND RELEVANCEAchieving an undetectable viral load was associated with decreased hepatic morbidity and mortality. It remains to be determined whether newer treatment regimens can offer higher response rates with fewer adverse effects in real-world settings.

Thirty eight observational studies from 14 countries were included. Classification of outbreaks by setting was straightforward: 29 outbreaks occurred over a territory (country, region, city, etc.), 4 outbreaks in a school, 2 outbreaks at hospital, 2 in an isolated community and 1 at university. Costs included in this study were costs incurred in controlling the outbreak. Treatments with antibiotics or prophylaxis were reported in 10 references covering all settings. GP or specialist visits were reported in 3 articles (2 outbreaks over a territory and 1 outbreak in a school). Finally 22 references reported information on hospitalisations: hospitalisation rates ranged from 0% to 8.8% for cases of pertussis (in 2 references, no hospitalisation occurred in the population exposed to the outbreak). Length of stay was reported in 2 references: 8.9 days in hospital and 13 days in paediatric intensive care unit considering an outbreak at hospital, and 4 days (1 to 48 days) over a territory. CONCLUSIONS: The extent and the management of outbreaks differed by setting, and the economic burden of pertussis outbreaks was not always comparable. Nevertheless this review shows that the burden may be substantial.

Background: The high cost of new hepatitis C (HCV) treatments has resulted in “watchful waiting” strategies being developed to safely delay treatment, which will in turn delay viral load suppression (VLS). Objective: To document if delayed VLS adversely impacted patient risk for adverse events and death. Methods: 187,860 patients were selected from the Veterans Administration’s (VA) clinical registry (CCR), a longitudinal compilation of electronic medical records (EMR) data for 1999–2010. Inclusion criteria required at least 6 months of CCR/EMR data prior to their HCV diagnosis and sufficient data post-diagnosis to calculate one or more FIB-4 scores. Primary outcome measures were time-to-death and time-to-a composite of liver-related clinical events. Cox proportional hazards models were estimated separately using three critical FIB-4 levels to define early and late viral response. Results: Achieving an undetectable viral load before the patient’s FIB-4 level exceed pre-specified critical values (1.00, 1.45 and 3.25) effectively reduced the risk of an adverse clinical events by 33–35% and death by 21–26%. However, achieving VLS after FIB-4 exceeds 3.25 significantly reduced the benefit of viral response. Conclusions: Delaying VLS until FIB-4 >3.25 reduces the benefits of VLS in reducing patient risk.

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.