• Charles Dolladille, Ederhy Stéphane S Hôpitaux Universitaires Paris-Est, Assistance Publique-Hôpitaux de Paris, Hôpital Saint Antoine, Service de Cardiologie, Unico, Unité de Cardio-Oncologi, Marion Sassier, Jennifer Cautela, Franck Thuny, Ariel A Cohen, Sophie Fedrizzi, Basile Chrétien, Angélique Da-Silva, Anne-Flore Plane, Damien Legallois, Paul U Milliez, Véronique Lelong-Boulouard, and Joachim Alexandre.
• Normandie University, University of Caen Normandy, Centre Hospitalier Universitaire (CHU) de Caen Normandie, PICARO Cardio-oncology Program, Department of Pharmacology, EA 4650, Signalisation, Électrophysiologie et Imagerie des Lésions d'Ischémie-Reperfusion Myocardique, Caen, France.
• JAMA Oncol. 2020 Jun 1; 6 (6): 865-871.

ImportanceLimited information is available on the safety of a rechallenge with an immune checkpoint inhibitor (ICI) after an immune-related adverse event (irAE).ObjectiveTo identify the recurrence rate of the same irAE that prompted discontinuation of ICI therapy after an ICI rechallenge in patients with cancer and to identify the clinical features associated with such recurrences.Design, Setting, And ParticipantsThis observational, cross-sectional, pharmacovigilance cohort study examined individual case safety reports from the World Health Organization database VigiBase, which contains case reports from more than 130 countries. Case reports were extracted from database inception (1967) to September 1, 2019. All consecutive ICI cases with at least 1 associated irAE were included.Main Outcomes And MeasuresThe primary outcome was the rate of recurrence of the initial irAE after an ICI rechallenge. Secondary outcomes included the factors associated with the recurrence after a rechallenge among informative rechallenges, the recurrence rate according to the ICI regimen (anti-programmed cell death 1 or anti-programmed cell death ligand 1 monotherapy, anti-cytotoxic T-lymphocyte antigen-4 monotherapy, or combination therapy), and the rate of occurrence of a different irAE after a rechallenge.ResultsA total of 24 079 irAE cases associated with at least 1 ICI were identified. Among the irAEs, 452 of 6123 irAEs associated with ICI rechallenges (7.4%) were informative rechallenges. One hundred thirty recurrences (28.8%; 95% CI, 24.8-33.1) of the initial irAE were observed. In a rechallenge, colitis (reporting odds ratio [OR], 1.77; 95% CI, 1.14-2.75; P = .01), hepatitis (reporting OR, 3.38; 95% CI, 1.31-8.74; P = .01), and pneumonitis (reporting OR, 2.26; 95% CI, 1.18-4.32; P = .01) were associated with a higher recurrence rate, whereas adrenal events were associated with a lower recurrence rate (reporting OR, 0.33; 95% CI, 0.13-0.86; P = .03) compared with other irAEs.Conclusions And RelevanceThis cohort study found a 28.8% recurrence rate of the same irAE associated with the discontinuation of ICI therapy after a rechallenge with the same ICI. Resuming ICI therapy could be considered for select patients, with appropriate monitoring and use of standard treatment algorithms to identify and treat toxic effects.

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