t-cells immune system cancer immunotherapy
In this 2011 image, tiny beads (yellow) are used to force T-cells to divide before they are given to leukemia patients.

University of Pennsylvania via Microbe World / Flickr

One biotech startup is hitting 2017 with a running start.

Cancer drug developer Jounce Therapeutics filed for an initial public offering on Dec. 30.

The filing includes a target of $75 million in the public offering, though that’s a placeholder and likely to change.

The filing is coming off a busy year for Jounce. In July, biotech company Celgene invested $261 million in Jounce in a deal that could ultimately be worth as much as $2.5 billion.

Jounce is developing drugs that harness the immune system to better attack cancer cells, a treatment often referred to…