Torl Biotherapeutics LLC has raised $158 million in a series B round as it seeks to nudge its anti-Claudin-6 antibody-drug conjugate candidates, TORL-123 and TORL-2307, beyond phase I trials for the treatment of ovarian and gastric cancers, respectively. Claudin-6, or CLDN6, is a molecule that forms tight junctions around cells. It is highly expressed in a range of solid tumor types, so is a popular target for drug development.