Aztreonam-avibactam for the treatment of serious infections caused by metallo-β-lactamase-producing Gram-negative pathogens: a Phase 3 randomized trial (ASSEMBLE)

Abstract

Background: The Phase 3 ASSEMBLE study investigated aztreonam-avibactam versus best available therapy (BAT) for treatment of complicated intra-abdominal infection (cIAI), complicated urinary tract infection (cUTI), hospital-acquired/ventilator-associated pneumonia (HAP/VAP) or bloodstream infection (BSI) caused by confirmed MBL-producing multidrug-resistant pathogens.

Methods: This prospective, multicentre, randomized, open-label, central assessor-blinded study randomized hospitalized adults 2:1 to aztreonam-avibactam [+ metronidazole (cIAI)] or BAT for 5-14 (cIAI, cUTI and BSI) or 7-14 (HAP/VAP) days. Primary endpoint was clinical cure at test-of-cure (TOC) visit on Day 28 ± 3 [microbiological ITT (micro-ITT) analysis set]. Secondary endpoints included microbiological response at TOC, 28-day mortality and safety. No formal hypothesis testing was planned.

Results: Fifteen patients were randomized [aztreonam-avibactam, n = 12; BAT, n = 3 (ITT and micro-ITT analysis sets)]. Most frequent baseline pathogens were Enterobacterales; Klebsiella pneumoniae was most common [aztreonam-avibactam, 6/12 (50%); BAT, 2/3 (67%)]. MBL subtypes/variants identified in the aztreonam-avibactam group were NDM-1 (n = 7), NDM-5 (n = 3), VIM-2 (n = 2) and L1 (n = 3); and for BAT were NDM-1 (n = 2) and NDM-5 (n = 1). Clinical cure rates at TOC were 5/12 (42%) for aztreonam-avibactam and 0/3 (0%) for BAT. Per-patient microbiological responses were generally consistent with clinical responses. Twenty-eight-day all-cause mortality rates for aztreonam-avibactam and BAT were 1/12 (8%) and 1/3 (33%), respectively. Aztreonam-avibactam was generally well-tolerated, with no treatment-related serious adverse events.

Conclusions: These Phase 3 data provide support for aztreonam-avibactam as a potential therapeutic option for difficult-to-treat infections caused by MBL-producing Gram-negative bacteria.