Halozyme Therapeutics (NASDAQ:HALO) investors had a great day today, with the stock up 12% on the news that the FDA lifted a clinical hold on its phase 2 trial of PEGPH20 for pancreatic cancer.

The hold had reflected FDA concerns about potential blood clots, but some changes to the trial design and screening sufficiently allayed those fears to allow the trial to proceed, and Halozyme has announced that it plans to enroll additional patients.

In this video, from Thursday's Market Checkup, the Motley Fool's health care-focused investing show, analysts Michael Douglass and David Williamson discuss the changes to the trial and what they think of the stock.