Abstract P2-17-01: Therapy of advanced breast cancer for patients with hormone receptor-positive/HER2-negative and HER2-positive tumors is changing in real life: First results from the prospective, national research platform OPAL for patients with advanced breast cancer in Germany

Abstract

Abstract Introduction Tumor Registries give insight into routine treatment and complement the knowledge derived from randomized controlled trials (RCT), since characteristics of patients from RCTs often differ from those of patients in routine care. Furthermore, follow-up of patients in registries is generally longer which gives the possibility to analyze sequential treatments. Since 2007 the Tumor Registry Breast Cancer (TMK, NCT01351584) has prospectively collected data on treatment and outcome of patients with breast cancer in Germany. Among other topics, insights into “real-world” treatment and outcome and long-term observation of quality of life have been published. Since 2017 the registry platform OPAL (NCT03417115) has extended the work of the TMK by recruiting patients with advanced breast cancer (ABC) from all specialties (medical and gynecologic oncologists). The main aims are to observe the impact of novel treatments on patient outcome, and to identify areas for improvement of quality of care. Methods OPAL started in December 2017. Patients are prospectively recruited at start of their first systemic treatment for ABC. Follow-up continues until death or up to 5 years. There is no treatment specification. Detailed information on all (sequential) treatments, patient and tumor characteristics, physician-reported factors regarding treatment decision making, biomarker testing, outcomes (e.g. best response, progression-free and overall survival) are collected in a web-based data capture system with implemented checks for completeness and plausibility. Data are monitored by data management and on-site. Patient-reported outcomes (PROs) are collected at start of treatment and every 3 months thereafter. Patients can also give informed consent for their tumor samples to be used in future translational research (virtual biobank). All patient data remain in Germany. Here, first combined data from the TMK and OPAL (database as of 01.04.2019) are presented. Results Since 2007, 5076 patients have been recruited. Patients with ABC (n=2105, 434 since the start of OPAL) have a median age of over 60 years at start of treatment; about 60% have comorbidities. For patients with hormone-receptor positive (HRpos)/HER2 negative (HER2neg) ABC, first-line treatment has changed over the years. From 2007-11 (n=458) 60% of patients started with chemotherapy, decreasing to 48% in 2012-16 (n=528) and to 23% in 2018-19 (n=170) with 58% of patients now being treated with CDK4/6-inhibitor. First-line of HER2pos ABC has also changed from 79% of patients receiving trastuzumab (TRA) between 2007-12 (n=268) to 78% of patients receiving dual-blockade with TRA/pertuzumab in 2018-19 (n=97) and 10% receiving TRA only. About 25% of patients treated with TRA in 2018-19 received a biosimilar. Median overall survival (OS) of patients with start of first-line therapy between 2007-16 is currently 15 months for triple-neg (74% events), 34 months for HRpos/HER2neg (59% events), 40 months for HER2pos (52% events); median OS has not yet been reached for patients in OPAL. Conclusions For patients with HRpos/HER2neg ABC, a shift towards more endocrine therapy in the first-line setting, and a quick implementation of CDK4/6-inhibitors after their approval can be observed. In patients with HER2pos ABC, integration of trastuzumab biosimilars into routine care has started. Prognosis for patients with triple-negative ABC remains poor and new treatment options are urgently needed. OPAL together with TMK will allow to follow changes in treatment of patients with ABC in a “real world” setting in Germany, the application of sequential treatments, and their impact on clinical as well as patient-reported outcome. Citation Format: Elmar Stickeler, Nadia Harbeck, Marc Thill, Arnd Nusch, Marco Chiabudini, Lisa Kruggel, Martina Jänicke, Norbert Marschner, Mark-Oliver Zahn, Anja Welt, Achim Wöckel, Thomas Decker, OPAL Study Group. Therapy of advanced breast cancer for patients with hormone receptor-positive/HER2-negative and HER2-positive tumors is changing in real life: First results from the prospective, national research platform OPAL for patients with advanced breast cancer in Germany [abstract]. In: Proceedings of the 2019 San Antonio Breast Cancer Symposium; 2019 Dec 10-14; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2020;80(4 Suppl):Abstract nr P2-17-01.