Final results of the global and Asia cohorts of KAMILLA, a phase IIIB safety trial of trastuzumab emtansine in patients with HER2-positive advanced breast cancer

Wuerstlein, R.; Ellis, P.; Montemurro, F.; Anton Torres, A.; Delaloge, S.; Zhang, Q.; Wang, X.; Wang, S.; Shao, Z.; Li, H.; Rachman, A.; Vongsaisuwon, M.; Liu, H.; Fear, S.; Pena-Murillo, C. und Barrios, C. (2022): Final results of the global and Asia cohorts of KAMILLA, a phase IIIB safety trial of trastuzumab emtansine in patients with HER2-positive advanced breast cancer. In: Esmo Open, Bd. 7, Nr. 5

Abstract

Background: KAMILLA is a single-arm safety study of trastuzumab emtansine (T-DM1) in patients with human epidermal growth factor receptor 2 (HER2)-positive advanced breast cancer (BC;NCT01702571). We report the final analysis of cohort 2 (Asia) within the context of published cohort 1 (Global) findings. Methods: Patients had HER2-positive, locally advanced, or metastatic BC progressing after chemotherapy and anti-HER2 therapy or <= 6 months after adjuvant therapy. The primary objective was to further evaluate T-DM1 (3.6 mg/kg, administered intravenously every 3 weeks) safety/tolerability, including the following adverse events of primary interest (AEPIs): grade >= 3 AEPIs (hepatic events, allergic reactions, thrombocytopenia, hemorrhage events), all grade >= 3 treatment-related AEs, and all-grade pneumonitis. Results: KAMILLA enrolled 2185 patients (cohort 1, n = 2003;cohort 2, n = 182) as of 31 July 2019. Of these, 2002 and 181 per cohort were treated and included in the safety population. Approximately 70% of patients had two or more previous treatment lines in the metastatic setting. Median T-DM1 exposure was 5.6 and 5.0 months per cohort;median follow-up was 20.6 and 15.1 months. The overall AEPI rate was higher in cohort 2 (93/181;51.4%) versus cohort 1 (462/2002;23.1%), mostly driven by a higher grade >= 3 thrombocytopenia rate in cohort 2. In cohort 2, grade >= 3 thrombocytopenia was not associated with grade >= 3 hemorrhagic events and most (128/138) fully resolved. Grade >= 3 treatment-related AEPI rates were 18.4% (cohort 1) and 48.6% (cohort 2), the latter mainly due to thrombocytopenia. Any-grade pneumonitis rates were 1.0% and 2.2%. No new safety signals were identified. Median (95% confidence interval) progression-free survival was 6.8 months (5.8-7.6 months) and 5.7 months (5.5-7.0 months) in cohorts 1 and 2, respectively;median overall survival was 27.2 months (25.5-28.7 months) and 29.5 months (21.1 months to non-estimable). In both cohorts, median progression-free survival and overall survival decreased with increasing prior therapy lines. Conclusions: Cohort 2 results aligned with previous findings in Asian patients, supporting the manageable safety profile and use of T-DM1 in advanced BC.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 491502892