Abstract 16803: Cabozantinib Induced Cardiomyopathy; Second Reported Case Of A Rare Adverse Effect
Case Presentation: A 27-year-old female with no prior medical history was diagnosed with metastatic paraganglioma in 2016. She was started on Cyclophosphamide, Vincristine and Dacarbazine and eventually transitioned to Pembrolizumab for 2 years. Due to progression of disease, she was started on compassionate 40 mg daily Cabozantinib in 2019. Echocardiogram at that time revealed normal ventricular function. One month later, she presented with new onset hypoxic respiratory failure. ProBNP was elevated to 7854 pg/nl. TTE showed moderate pericardial effusion with cardiac tamponade physiology and LVEF of 30%. Cabozantinib was discontinued due to elevated LFT. Repeat TTE after 1 month showed recovery of LVEF to 55% and only trace pericardial effusion. Due to her aggressive malignancy Cabozantinib was reinitiated at 20mg daily. Her LVEF remained stable on multiple serial TTE for 1 year so an attempt at Cabozantinib 40 mg was made once again. One month later, she had worsening dyspnea and TTE showed LVEF drop to 35%. Cardiac MRI revealed LVEF 37% with a moderate pericardial effusion along with gadolinium uptake consistent with perimyocarditis. Cabozanitib was discontinued and Colchicine 0.6 mg daily started. Eventually, LVEF normalized and pericardial effusion resolved. Patient was restarted on Cabozanitib 20mg and has remained stable from a cardiovascular standpoint Discussion: In the past decade the rise of tyrosine kinase inhibitors, like Cabozantinib, have transformed the scope of medical oncology. In 2019 Al hussein et al described the first case of Cabozantinib induced cardiomyopathy. We present, to our knowledge, the second reported case. This case identifies a strong temporal relationship between Cabozantinib, LV systolic dysfunction and perimyocarditis with higher doses. Interestingly, our patient received Pembrolizumab for 2 years, but had heart failure symptoms only 1 month after Cabozanitib initiation. Although theoretically possible, it is unlikely Pembrolizumab was the cause, given normal TTE 2 years after initiation and strong temporal relationship to Cabozantinib. Further studies are required to establish the cardiotoxic side effects of Cabozantinib and inform guidance on cardiac monitoring.