A closer look at immune-mediated myocarditis in the era of combined checkpoint blockade and targeted therapies. (January 2020)

• Record Type: Journal Article
• Authors: Guo, Christina W.; Alexander, Marliese; Dib, Youseph; Lau, Peter K.H.; Weppler, Alison M.; Au-Yeung, George; Lee, Belinda; Khoo, Chloe; Mooney, Don; Joshi, Subodh B.; Creati, Louise; Sandhu, Shahneen
• Is Part Of: European journal of cancer. Volume 124(2020)
• Page Start: 15
• Page End: 24
• Publication Date: 2020-01
• Subjects: Melanoma -- Myocarditis -- Immunotherapy -- Drug-related side effects and adverse events -- Magnetic resonance imaging; Cancer -- Periodicals; Neoplasms -- Periodicals; Cancer -- Périodiques; Cancer; Tumors; Electronic journals; Periodicals; Electronic journals; 616.994
• DOI: 10.1016/j.ejca.2019.09.009
• Languages: English
• ISSNs: 0959-8049

Abstract

Abstract: Immune checkpoint inhibitors (ICI) and tyrosine kinase inhibitors (TKI) have transformed the management of many malignancies. Although rare, immune-mediated myocarditis presents unique clinical challenges due to heterogenous presentation, potential life-threatening consequences, and the time-critical need to differentiate it from other causes of cardiac dysfunction. Increasingly, TKI are being combined with ICI to promote immune modulation and improve efficacy. However, these combinations are associated with more toxicities. This series describes six patients with advanced melanoma who developed immune-mediated myocarditis while receiving an anti-PD-1 antibody or an anti-PD-L1 antibody plus a mitogen-activated protein kinase inhibitor. It provides a review of their heterogenous clinical presentations, investigational findings and treatment outcomes. Presentations ranged from asymptomatic cardiac enzyme elevation to death due to heart failure. We highlight the role of cardiac MRI (CMRI), a sensitive and non-invasive tool for the early detection and subsequent monitoring of myocardial inflammation. Five of the six patients exhibited CMRI changes characteristic of myocarditis, including mid-wall myocardial oedema and late gadolinium enhancement in a non-coronary distribution. Critically, two of these patients had normal findings on echocardiogram. Of the five patients who received immunosuppression, four recovered from myocarditis and one died of cardiac failure. The sixth patient improved with cardiac failure management alone. Three of the four patients responding to ICI derived long-term benefit. Clinical vigilance, prompt multimodal diagnosis and multidisciplinary management are paramount for the treatment of immune-mediated myocarditis. Highlights: Targeted therapies in conjunction with immune checkpoint inhibitors may increase the incidence of immune-mediated myocarditis. Cardiac MRIs have high utility in the diagnosis and monitoring of myocarditis. Immune-mediated myocarditis often associates with other immunotherapy toxicities. Myocarditis requires multimodal diagnosis and multidisciplinary management.