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2019 ASCO Annual Meeting!

Session: Breast Cancer—Local/Regional/Adjuvant

Type: Poster Session

Time: Sunday June 2, 8:00 AM to 11:00 AM

Location: Hall A

Cardiac safety of the trastuzumab biosimilar ABP 980 in women with HER2-positive early breast cancer in the LILAC study.

Adjuvant Therapy

Breast Cancer—Local/Regional/Adjuvant

2019 ASCO Annual Meeting

Abstract No:

Poster Board Number:
Poster Session (Board #49)

J Clin Oncol 37, 2019 (suppl; abstr 557)

Author(s): Hans-Christian Kolberg, Marco Colleoni, Georgia Demetriou, Patricia Xavier Santi, Hans Tesch, Yasuhiro Fujiwara, Zorica Tomasevic, Vladimir Hanes; Marienhospital, Bottrop, Germany; European Institute of Oncology, Milan, Italy; Wits Oncology Wits Donald Gordon Medical Centre, Parktown, South Africa; Centro de Estudos de Hematologia e Oncologia, São Paolo, Brazil; Haemato-Oncology Practice, Bethanien Hospital, Frankfurt, Germany; National Cancer Center Hospital, Tokyo, Japan; Institute for Oncology and Radiology of Serbia, Daily Chemotherapy Hospital, Belgrade, Serbia; Amgen Inc., Thousand Oaks, CA

Abstract Disclosures


Background: Although trastuzumab is generally well-tolerated, cardiotoxicity is the main limitation in its use, leading to a severe heart failure in 2-4% of patients in adjuvant trials. In the phase 3 LILAC trial, trastuzumab biosimilar ABP 980 demonstrated similar efficacy, safety, and immunogenicity to trastuzumab reference product (RP) in women with HER2-positive early breast cancer. Here we report analyses comparing cardiac safety of ABP 980 and RP. Methods: In the neoadjuvant phase, all 725 patients received 4 cycles of chemotherapy with epirubicin + cyclophosphamide Q3W and were then randomized 1:1 to ABP 980 (n = 364) or RP (n = 361) with a loading dose of 8 mg/kg, then 6 mg/kg IV Q3W for 3 cycles plus paclitaxel Q3W (4 cycles) or QW (12 cycles). After surgery, patients received investigational product (IP) Q3W for up to 1 year; ABP 980-treated patients continued ABP 980, and RP-treated patients either continued RP (n = 190) or switched to ABP 980 (RP/ABP 980; n = 171). AEs were assessed every 3 weeks and cardiac safety every 3 months. Cardiac safety was monitored by computerized 12-lead ECG; LVEF was assessed by 2D ECHO. LVEF decline was defined as LVEF value decrease from study baseline by ≥10 percentage points and to < 50%. Results: Treatment groups were well balanced with regard to IP disposition. Over the entire study, 22 (3.1%) patients had LVEF decline by ≥10 percentage points compared to baseline and to < 50%; no meaningful between-group differences were observed (ABP 980:10/359 [2.8%], RP: 6/184 [3.3%], RP/ABP 980: 6/171 [3.5%]). The incidence of cardiac AEs was low and comparable in treatment groups. One grade 3 cardiac failure event was reported in the RP/ABP 980 arm; another in the RP arm was coincident with LVEF decline. No patient discontinued IP during adjuvant phase because of cardiac failure. Conclusions: These pre-specified analyses confirm the tolerability of ABP 980 and demonstrate clinical similarity of ABP 980 and RP with respect to cardiac safety. The incidence of LVEF decline was consistent with the known cardiac safety profile of the RP. No new cardiac safety signals were observed whether patients were on ABP 980 or switched from RP to ABP 980. Clinical trial information: NCT01901146

Other Abstracts in this Sub-Category:


1. Neoadjuvant trastuzumab (H), pertuzumab (P), and chemotherapy versus trastuzumab emtansine (T-DM1) and P in human epidermal growth factor receptor 2 (HER2)-positive breast cancer (BC): Final outcome results from the phase III KRISTINE study.

Meeting: 2019 ASCO Annual Meeting Abstract No: 500 First Author: Sara A. Hurvitz
Category: Breast Cancer—Local/Regional/Adjuvant - Adjuvant Therapy


2. HER2 heterogeneity as a predictor of response to neoadjuvant T-DM1 plus pertuzumab: Results from a prospective clinical trial.

Meeting: 2019 ASCO Annual Meeting Abstract No: 502 First Author: Otto Metzger Filho
Category: Breast Cancer—Local/Regional/Adjuvant - Adjuvant Therapy


3. Impact of clinical risk category on prognosis and prediction of chemotherapy benefit in early breast cancer (EBC) by age and the 21-gene recurrence score (RS) in TAILORx.

Meeting: 2019 ASCO Annual Meeting Abstract No: 503 First Author: Joseph A. Sparano
Category: Breast Cancer—Local/Regional/Adjuvant - Adjuvant Therapy