Abstract P1-08-07: Educational Opportunities to Improve HER2 Testing and Use of Newer Therapies for HER2-Positive MBC Among Community Healthcare Professionals
Authors: Topping Ryan P. , Andrie Rachael M. , Rosenthal Kristen , Quill Timothy A. 
Published: March 2023

Background: The management of HER2-positive (HER2+) metastatic breast cancer (MBC) has continued to evolve, with multiple FDA approvals of novel HER2-targeted agents since late 2019. Considering the growing HER2+ MBC treatment armamentarium and the emerging HER2-low MBC subtype, we undertook an analysis of the current implementation of guideline and expert recommendations for HER2 testing and treatment of HER2+ MBC with recently approved agents among oncology healthcare professionals (HCPs) participating in educational programs on these topics.

Methods: Between January 2020 and April 2022, we conducted several expert-designed educational activities for HCPs focusing on recommended HER2 testing and treatment of HER2+ MBC. Polling questions on HCP knowledge, practice patterns, and confidence in the evaluation of HER2 status and the use of newer targeted therapies in the setting of HER2+ MBC were assessed across the activities and compared with expert recommendations.

Results: Among 129 HCPs participating in 2 educational activities held from July 2020 to March 2021, 53% reported confidence to appropriately apply current HER2 testing guidelines to patient care. Similarly, among 407 HCPs who participated in 4 educational programs from May 2020 to January 2021, 24% reported confidence to incorporate recently approved drugs (including trastuzumab deruxtecan [T-DXd], neratinib, and tucatinib) into the care of patients with HER2+ MBC. The percentage of HCPs reporting confidence in the use of these new drugs remained low over this time period.

Comparison of treatment recommendations for various HER2+ MBC case scenarios across 7 educational activities from January 2020 through April 2022 showed considerable discordance between experts and HCPs regarding the implementation of newly approved HER2-targeted regimens (Table 1). For patients with disease progression after 2 lines of therapy and no central nervous system (CNS) metastases, 27% to 57% of HCPs (n = 571) chose T-DXd in agreement with experts. For patients with disease progression after 2 lines of therapy with CNS metastases, 27% to 42% of HCPs (n = 597) chose a tucatinib-based regimen in agreement with experts. Treatment choice concurrence between HCPs and experts did not increase over the course of this study for either of these patient scenarios.

Conclusions: These data suggest that some HCPs are challenged to optimally incorporate recommendations for HER2 testing and the implementation of novel HER2-targeted therapies in the care of patients with HER2+ MBC. Educational activities designed to improve the knowledge and confidence of HCPs would benefit patients with HER2+ MBC. A detailed analysis of trends over time and by role on the care team will be presented.

Table 1. Expert and HCP Treatment Selections for Case Scenarios in HER2+ MBC.

Citation Format: Ryan P. Topping, Rachael M. Andrie, Kristen Rosenthal, Timothy A. Quill. Educational Opportunities to Improve HER2 Testing and Use of Newer Therapies for HER2-Positive MBC Among Community Healthcare Professionals [abstract]. In: Proceedings of the 2022 San Antonio Breast Cancer Symposium; 2022 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2023;83(5 Suppl):Abstract nr P1-08-07.