SAT443 Prevalence Of Immune Checkpoint Inhibitor-related Endocrinopathies In Patients With Cancers

Disclosure: S. Pittampalli: None. S.R. Lubin: None. R. Acharya: None. Background: Immune checkpoint inhibitors (ICIs), emerged as the primary treatment modality for a wide range of cancers improving overall survival. Nevertheless, improved overall survival is complicated by endocrine dysfunctions including thyroid dysfunction, adrenalitis, diabetes mellitus, and hypophysitis. Such adverse events offset the benefits of ICI therapy and are associated with significant morbidity and mortality. Limited data exists concerning the burden of the ICI-related endocrinopathies in cancer treatment.Objective: To identify the prevalence and timing of onset of various endocrinopathies in patients with cancers receiving ICIs. Methods: A retrospective study was conducted at SUNY Upstate Medical University, NY comprising of adult patients. The study population consisted of all patients age 18 and above seen at Upstate Medical University between 1 January 2019 and 31 December 2021. Anonymized aggregate-level data was collected using an EPIC Slicer Dicer to identify all adult patients with cancer who underwent ICI therapy and a total of 199 patients were included. Demographic, clinical, histopathological, laboratory data were examined. The study was reviewed by IRB and deemed exempt. The following ICI-related endocrinopathies were considered: Hypothyroidism, hyperthyroidism, diabetes mellitus, adrenal insuffiency, and hypophysitis. ICI treatments included: anti-PD-1 (nivolumab, pembrolizumab, cemiplimab), anti-PD-L1 (atezolizumab, avelumab, durvalumab), and combination therapy (ipilimumab and nivolumab, or any other ICI combinations). Statistical analysis including descriptive statistics, ANOVA was conducted using IBM SPSS software.Results: A total of fifty patients (25%) developed ICI-related endocrinopathy (n=28 M, 22 F) with a mean age of onset 63.69 years. Majority of the patients were being treated for lung cancers (51%) and had hypothyroidism (88%) followed by adrenal insufficiency (9%) and diabetes (2%). There were no cases of hyperthyroidism or hypophysitis observed. The average time of onset of endocrinopathies after initiation of ICI therapy was 22 weeks (anti-PD-1=122 days, anti-PD-L1=180 days and combination therapy= 252 days) with a significantly later onset with combined therapy when compared to anti-PD-1 inhibitors (252 vs 122 days, p= 0.004). Conclusion: With the increasing use of immune checkpoint inhibitors in cancer therapy, there is increased prevalence of endocrinopathies. Periodic hormonal assessment along with close monitoring of new symptoms results in early detection of endocrinopathies as the time of onset varies significantly with the type of ICI agent and the use of single vs combination therapy. Presentation: Saturday, June 17, 2023