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Everolimus-induced pneumonitis associates with favourable outcome in patients with metastatic renal cell carcinoma.
European Journal of Cancer 2017 August
BACKGROUND: Mammalian target of rapamycin inhibitors may induce pneumonitis. We analysed the association of pneumonitis with outcomes in everolimus treated metastatic renal cell carcinoma (mRCC) patients.
PATIENTS AND METHODS: Eighty-five mRCC patients received everolimus at Helsinki University Hospital (cohort A). Computed tomography (CT) verified pneumonitis was correlated with outcome using Kaplan-Meier, Cox regression and logistic regression. An independent cohort of 148 everolimus treated mRCC patients (cohort B) at Aarhus University Hospital was assessed for validation.
RESULTS: In cohort A, CT-verified pneumonitis (N = 29, 34.1%) was associated with improved overall survival (OS) (24.7 versus 8.5 months; P < 0.001), progression-free survival (PFS) (5.5 versus 3.2 months; P = 0.002) and clinical benefit rate (CBR) 57.1% versus 24.1% (P = 0.003). In multivariate analyses pneumonitis was associated with improved OS (hazard ratio [HR], 0.22; 95% confidence interval [CI] 0.12-0.44; P < 0.001), PFS (HR 0.37; 95% CI 0.21-0.66; P = 0.001) and CBR (odds ratio [OR] 4.11; 95% CI 1.42-11.95; P = 0.01). In cohort B, CT-verified pneumonitis (N = 29, 19.6%) was associated with improved OS (12.9 versus 6.0 months; P = 0.02), PFS (6.0 versus 2.8 months; P = 0.02) and CBR (79.3% versus 39.5%; P < 0.001). In multivariate analyses pneumonitis was associated with improved OS (HR 0.58; 95% CI 0.36-0.94; P = 0.03), PFS (HR 0.61; 95% CI 0.39-0.95; P = 0.03) and CBR (OR 5.65; 95% CI 2.10-15.18; P = 0.001). In a combined multivariate analysis (N = 233), with pneumonitis as a time-dependent covariate, CT-verified pneumonitis was associated with longer OS (HR, 0.67; 95% CI 0.46-0.97; P = 0.03). Furthermore, in a landmark analysis, pneumonitis was associated with longer OS (17.4 versus 7.8 months; P = 0.01).
CONCLUSIONS: Everolimus-induced pneumonitis is associated with improved outcome in patients with mRCC and may serve as a biomarker of everolimus efficacy.
PATIENTS AND METHODS: Eighty-five mRCC patients received everolimus at Helsinki University Hospital (cohort A). Computed tomography (CT) verified pneumonitis was correlated with outcome using Kaplan-Meier, Cox regression and logistic regression. An independent cohort of 148 everolimus treated mRCC patients (cohort B) at Aarhus University Hospital was assessed for validation.
RESULTS: In cohort A, CT-verified pneumonitis (N = 29, 34.1%) was associated with improved overall survival (OS) (24.7 versus 8.5 months; P < 0.001), progression-free survival (PFS) (5.5 versus 3.2 months; P = 0.002) and clinical benefit rate (CBR) 57.1% versus 24.1% (P = 0.003). In multivariate analyses pneumonitis was associated with improved OS (hazard ratio [HR], 0.22; 95% confidence interval [CI] 0.12-0.44; P < 0.001), PFS (HR 0.37; 95% CI 0.21-0.66; P = 0.001) and CBR (odds ratio [OR] 4.11; 95% CI 1.42-11.95; P = 0.01). In cohort B, CT-verified pneumonitis (N = 29, 19.6%) was associated with improved OS (12.9 versus 6.0 months; P = 0.02), PFS (6.0 versus 2.8 months; P = 0.02) and CBR (79.3% versus 39.5%; P < 0.001). In multivariate analyses pneumonitis was associated with improved OS (HR 0.58; 95% CI 0.36-0.94; P = 0.03), PFS (HR 0.61; 95% CI 0.39-0.95; P = 0.03) and CBR (OR 5.65; 95% CI 2.10-15.18; P = 0.001). In a combined multivariate analysis (N = 233), with pneumonitis as a time-dependent covariate, CT-verified pneumonitis was associated with longer OS (HR, 0.67; 95% CI 0.46-0.97; P = 0.03). Furthermore, in a landmark analysis, pneumonitis was associated with longer OS (17.4 versus 7.8 months; P = 0.01).
CONCLUSIONS: Everolimus-induced pneumonitis is associated with improved outcome in patients with mRCC and may serve as a biomarker of everolimus efficacy.
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