Human monoclonal antibody (hMAb) cocktail SM-17220 (also known as BT-570), a heterofunctional antibody mixture of 3 human IgM MAbs (HI-223, MH-4H7, and IN-2A8; ratio of 1:10:10) directed against Pseudomonas aeruginosa, were administered to patients with pneumonia or burn wounds (or both) to assess the pharmacokinetics, safety, antigenicity, and preliminary efficacy. Twenty mg of SM-17220 was IV infused over 60 min once daily on 3 consecutive days. Twenty patients (8 pneumonia, 4 burns, and 8 both) completed the study. SM-17220 was safe and well tolerated, and no subjects developed antibodies to SM-17220 and mouse J-chain during the follow-up of 8 weeks. Each MAb of SM-17220 had a half-life ranging from 49 to 91 h, similar to native human IgM. Both MH-4H7 and IN-2A8 administration resulted in a high serum level for about 4 days over an effective concentration, whereas HI-223 showed a lower serum level than expected. Some indications of a potential efficacy were observed and are discussed here.
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