The UK biotech Epsilogen has significantly expanded its repertoire of antibody technologies with the acquisition of TigaTx Inc, of Boston, US, in order to treat more patients with cancer. The deal, announced on 7 April, equips Epsilogen, a clinical-stage company, with technology and assets of the IgA antibody subtype. These activate neutrophils, a type of white blood cell that is an essential part of the immune system. Epsilogen already has IgG antibody assets, the most abundant subtype, and IgE assets, a less common isotype which can activate macrophages.