David Southwell, a seasoned pharma exec and CEO of newly funded Tscan Therapeutics Inc., called from a small, unadorned conference room on the Harvard campus to talk about his new company. He's used to being on the clinical development side, where the accommodations are a bit more posh, but nonetheless he's pleased to be investigating T-cell therapy for cancer patients.

DUBLIN – Biontech SE closed a mammoth $325 million series B round to fund expansion of its clinical pipeline and to continue its ongoing investments in several different areas of manufacturing. The scale of the deal is of historic proportions – it is the biggest private equity investment in any comparable European biotechnology firm. It just edges ahead of Oxford, U.K.-based Immunocore Ltd.'s $320 million investment in 2015.