Article
Author: Patsouris, A ; Teixeira, L ; Bidard, F-C ; Franchet, C ; Uwer, L ; Gonçalves, A ; Bécourt, S ; Reverdy, T ; Jacot, W ; Brunet, M ; Deleuze, A ; de Nonneville, A ; Deluche, E ; Morisseau, M ; Levy, C ; Poumeaud, F ; Loirat, D ; Pagliuca, M ; Cabel, L ; Frenel, J-S ; Dalenc, F ; Jamelot, M ; Cabarrou, B ; Grellety, T ; Bailleux, C ; Fiteni, F ; Vion, R ; Rivier, C ; Verret, B ; Volant, E ; Ladoire, S ; Trédan, O ; Bischoff, H ; Foka Tichoue, H
BACKGROUNDCurrent guidelines recommend that patients with HER2-low metastatic breast cancer (MBC) receive sequentially two antibody-drug conjugates (ADCs): Sacituzumab Govitecan (SG) and Trastuzumab Deruxtecan (T-DXd), despite a similar payload. However, the effectiveness of one after another is unknown.METHODSADC-Low is a multicentre, retrospective study evaluating the efficacy of SG and T-DXd, one after another, with or without intermediary lines of chemotherapy, in patients with HER2-low MBC.RESULTSOne hundred and seventy-nine patients were included: the majority with HR-negative tumours received SG first (ADC1) (n = 100/108) while most with HR-positive tumours received T-DXd first (n = 56/71). Median progression-free survival 2 was short: 2.7 months (95% CI: 2.4-3.3) in the whole population, respectively, 3.1 (95% CI: 2.6-3.6) and 2.2 months (95% CI: 1.9-2.7) for patients receiving T-DXd or SG second (ADC2). Intermediary lines of chemotherapy between ADC1 and ADC2 had no impact. Primary resistance to ADC2 occurred in 54.4% of patients. Certain patients showed initial response to ADC2.CONCLUSIONSClinical benefit of sequentially administered SG and T-DXd is limited for most patients. Nevertheless, a subset of patients might benefit-on the short term-from a second ADC. Additional studies are needed to identify patients who could benefit from two ADCs with similar payloads.