Princess Margaret Cancer Centre, Toronto, ON, Canada
RuiQui Chen, Elliot Charles Smith, Sze Wah Samuel Chan, Katrina Hueniken, M. Catherine Brown, Habeeb Majeed, Kendra Ross, Diana Gray, Wei Xu, David Hogg, Srikala S. Sridhar, Adrian G. Sacher, Natasha B. Leighl, Monika K. Krzyzanowska, Marcus O. Butler, Geoffrey Liu, Lawson Eng
Background: Prior clinical trials in melanoma have demonstrated higher rates of irAEs from combination ICI therapy compared to monotherapy. However, this has not been well studied in the real-world where patients often have greater co-morbidities and less organ reserve. We aim to compare irAEs hospitalizations for melanoma patients on combination vs monotherapy ICIs. Methods: We performed a single centre retrospective chart review (Princess Margaret Cancer Centre, Toronto, ON) for all melanoma patients receiving ICI as standard of care (2012-2017) admitted with irAEs. Data collected include demographics, investigations, management and outcomes of hospitalizations. Descriptive analyses were performed to characterize hospitalizations and compare between ICI combination vs monotherapy groups. Results: Among 381 melanoma patients identified on standard of care ICI, 41 (11%) were admitted for irAE. Among those admitted, 10% received monotherapy with nivolumab, 22% pembrolizumab, 39% ipilimumab and 29% combination ICI. Admission rates were higher among patients receiving combination ICI compared to monotherapy (20% vs 8% p = 0.003). Prevalence of the most common irAEs were similar between combination and monotherapy groups: colitis (58% vs 59%), pneumonitis (8% vs 14%) and hepatitis (8% vs 10%). Less than half received invasive diagnostic tests (i.e, endoscopy) (42% combination vs 35% monotherapy, p = 0.50) with 3 (60%) and 5 (50%) confirming irAEs, respectively. Rates of infliximab use were similar between the combination and monotherapy group (25% vs 21%, p = 0.70). Average length of stay was shorter for patients on combination ICI compared to monotherapy (5 days vs 15 days, p = 0.08). irAE readmission rates were similar between patients receiving combination ICI compared to monotherapy (20% vs 17%, p = 0.65). Conclusions: Despite higher admission rates among patients receiving combination ICI, there was a trend towards shorter hospitalizations. Other outcomes including diagnoses, investigations and management were not significantly different between patients receiving combination vs ICI monotherapy.
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