Grey Wolf Therapeutics Ltd, a biotech company launched in 2017 to develop a new way of targeting solid tumours, has raised $49 million in an oversubscribed Series B financing round to bring its first product into the clinic. The financing was co-led by Pfizer Ventures and Earlybird Venture Capital with support from new and existing investors. The company has generated a pipeline of small molecule drugs that inhibit enzymes which play an important role in the presentation of cancer antigens to the immune system. The enzymes are endoplasmic reticulum aminopeptidases 1 and 2.