Abstract PO3-12-04: Pulmonary Complication related to Trastuzumab Deruxtecan. A pharmacovigilance study from 2022-2023 FAERS Database

Abstract

Abstract Background: The horizon of Trastuzumab Deruxtecan (T-DXd), an antibody-drug conjugate, has been expanding. After its promising results in HER2-positive/HER2-low Breast cancer, it has been on trial for other cancers, such as HER2-negative breast cancers, Gastrointestinal, lung, colorectal, urothelial, etc., and it has shown promising results in clinical trials. However, there have been reports of pulmonary adverse events associated with T-DXd, including interstitial lung disease (ILD) and pneumonitis. Understanding the occurrence and characteristics of these pulmonary complications is essential for optimizing patient care and ensuring the safe use of T-DXd. Using the FAERS (FDA Adverse Event Reporting System) database for 2022-2023 aims to see T-DXd-related pulmonary complications and guide healthcare professionals in monitoring and managing these adverse events effectively. Methods: We conducted a retrospective analysis of all reported cases of respiratory complications in patients using TDXD, utilizing data reported to the FDA Adverse Event Reporting System (FAERS) database for January 2022 to March 2023. We included patients of more than 18; these cases were identified and classified using the Medical Dictionary for Regulatory Activities (MedDRA) terminology. Results: In this study, a total of 296 cases of adverse events were reported in patients using TDXD. Among these cases, 74 (27%) were respiratory adverse events. The most frequently observed respiratory complications were interstitial lung disease (ILD) and pneumonitis, with 21 cases each, accounting for 56% of the total respiratory complications. Out of the 14 reported deaths in this cohort, pneumonitis was the most commonly seen respiratory complication, occurring in 8 patients, followed by pulmonary embolism and ILD, each reported in 4 patients. Conclusion: Respiratory complications were the most frequent among the reported adverse events, accounting for 27% of all cases. ILD and pneumonitis were the most common complications, with 14 deaths reported in this group. These findings underline the importance of closely monitoring and managing pulmonary adverse events in patients treated with T-DXd. Healthcare professionals can use this information to optimize patient care and ensure the safe use of T-DXd. However, it is important to note that this study was based on a database and has limitations such as underreporting bias and lack of a control group, which hinders establishing a causal relationship. Additional research is needed to identify risk factors and improve patient outcomes. Citation Format: Niraj Neupane, Himal Kharel, Sangharsha Thapa. Pulmonary Complication related to Trastuzumab Deruxtecan. A pharmacovigilance study from 2022-2023 FAERS Database [abstract]. In: Proceedings of the 2023 San Antonio Breast Cancer Symposium; 2023 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2024;84(9 Suppl):Abstract nr PO3-12-04.