Artios Pharma Ltd, which is building a portfolio of small molecule drugs designed to kill cancer cells by blocking their ability to repair damaged DNA, has raised $153 million in a Series C financing round. The company is preparing to take a compound targeting DNA polymerase theta (Pol theta) into clinical development before the end of the year. Pol theta is an enzyme that plays a role in the proliferation of certain cancer cells but which is not necessary for normal cell growth.