Ask ImmunoGen CEO Dan Junius why an experimental drug called IMGN853 is important for the company, and he will tell you it’s the company’s best shot at having a wholly-owned medicine on the market in coming years. But ask him why it’s important for patients with ovarian cancer, and he will cite some striking statistics. While development of cancer drugs has come a long way in the past 10 years, most of the advancements have been in blood cancers.