Miller, Abigail R

Balino, Aries

Tun Min, Sandy

Downton, Teesha

Karanth, Narayan

Backen, Alison

Charakidis, Michail

2024-07-05

Use of immune checkpoint inhibitors is growing, but clinical trial data may not apply to Indigenous patients or patients living in remote areas.To provide real-world incidence of immune-related adverse events (irAE) in the Top End of the Northern Territory and compare incidence between demographic subgroups.This retrospective, observational, cohort study collected data from electronic records of patients living in the Top End with solid organ cancer treated with immunotherapy between January 2016 and December 2021. The primary outcome was cumulative incidence of any-grade and severe irAE. Secondary outcomes were overall survival, treatment duration and reason for treatment discontinuation.Two hundred and twenty-six patients received immunotherapy. Forty-eight (21%) lived in a remote or very remote area, and 36 (16%) were Indigenous. Cumulative incidence of any-grade irAE was 54% (122/226 patients); incidence of severe irAE was 26% (59/226 patients). Rates were similar between Indigenous and non-Indigenous patients of any-grade (42% vs 56%, P = 0.11) and severe (11% vs 18%, P = 0.29) irAE. However, Indigenous patients had shorter treatment duration, more frequently discontinued treatment due to patient preference and appeared to have shorter median overall survival than non-Indigenous patients (17.1 vs 30.4 months; hazard ratio (HR) = 1.5, 95% confidence interval (CI) = 0.92-2.66). There was no difference in mortality between remote and urban patients (median overall survival 27.5 vs 30.2 months; HR = 1.1, 95% CI = 0.7-1.7).Rates of irAE in our cohort are comparable to those in the published literature. There was no significant difference in any-grade or severe irAE incidence observed between Indigenous and non-Indigenous patients.

Cancer Service, The Queen Elizabeth Hospital, Central Adelaide Local Health Network, Adelaide, South Australia, Australia.

Medical Oncology, Royal Darwin Hospital, Darwin, Northern Territory, Australia.

Medical Oncology, Royal Darwin Hospital, Darwin, Northern Territory, Australia.

Medical Oncology, Royal Darwin Hospital, Darwin, Northern Territory, Australia.

Medical Oncology, Royal Darwin Hospital, Darwin, Northern Territory, Australia.

Medical Oncology, The Christie NHS Foundation Trust, Manchester, UK.

Medical Oncology, Royal Darwin Hospital, Darwin, Northern Territory, Australia.

Faculty of Health, Charles Darwin University, Darwin, Northern Territory, Australia.

Intern Med J . 2024 Jul 5. doi: 10.1111/imj.16461. Online ahead of print.

1445-5994

0000-0002-3043-7401

0000-0002-3392-7465

https://pubmed.ncbi.nlm.nih.gov/38966996/?otool=iaurydwlib

https://hdl.handle.net/10137/13443

Indigenous Australians

adverse drug event

healthcare disparities

immune checkpoint inhibitor

rural health

Real-world experience of immune checkpoint inhibitors in patients with solid tumours in the Top End of the Northern Territory, Australia from 2016 to 2021: a retrospective observational cohort study.

Journal Article

Publication