Rituximab exposure is influenced by baseline metabolic tumor volume and predicts outcome of DLBCL patients: a LYSA study.
Fiche publication
Date publication
mars 2017
Journal
Blood
Auteurs
Membres identifiés du Cancéropôle Est :
Dr CASASNOVAS Olivier, Pr FEUGIER Pierre
Tous les auteurs :
Tout M, Casasnovas O, Meignan M, Lamy T, Morschhauser F, Salles G, Gyan E, Haioun C, Mercier M, Feugier P, Boussetta S, Paintaud G, Ternant D, Cartron G
Lien Pubmed
Résumé
High variability in patient outcome after rituximab-based treatment is partly explained by rituximab concentrations, and pharmacokinetic variability could be influenced by tumor burden. We aimed at quantifying the influence of baseline total metabolic tumor volume (TMTV0) on rituximab pharmacokinetics and of TMTV0 and rituximab exposure on outcome in patients with diffuse large B-cell lymphoma (DLBCL). TMTV0 was measured by (18)F-FDG-PET/CT in 108 previously untreated DLBCL patients who received four 375 mg/m(2) rituximab infusions every 2 weeks in combination with chemotherapy in two prospective trials. A two-compartment population model allowed describing rituximab pharmacokinetics and calculating rituximab exposure (area under the concentration-time curve; AUC). The association of TMTV0 and AUC with metabolic response after 4 cycles, as well as progression-free survival (PFS) and overall survival (OS), was assessed using logistic regression and Cox models, respectively. Cutoff values for patient outcome were determined using ROC curve analysis. Exposure to rituximab decreased as TMTV0 increased (R(2)=0.41, P<.0001). A high AUC in cycle 1 (≥9400 mg.h/L) was associated with better response (OR, 5.56; P=.0006) and longer PFS (hazard ratio [HR], 0.38; P=.011) and OS (HR, 0.17; P=.001). A nomogram for rituximab dose needed to obtain optimal AUC according to TMTV0 was constructed, and the 375 mg/m(2) classical dose would be suitable for patients with TMTV0 <281 cm(3) In summary, rituximab exposure is influenced by TMTV0 and correlates with response and outcome of DLBCL patients. Dose individualization according to TMTV0 should be evaluated in prospective studies. Studies were registered at www.clinicaltrials.gov as NCT00498043 and NCT00841945.
Mots clés
Adult, Aged, Antineoplastic Agents, administration & dosage, Disease-Free Survival, Dose-Response Relationship, Drug, Female, Humans, Kaplan-Meier Estimate, Lymphoma, Large B-Cell, Diffuse, drug therapy, Male, Middle Aged, Positron-Emission Tomography, Rituximab, administration & dosage, Treatment Outcome, Tumor Burden, drug effects, Young Adult
Référence
Blood. 2017 Mar;: