While Gilead (GILD 0.64%) is often thought of as king in the HIV space and is leading the race for successful interferon-free hepatitis C treatment with some astounding cure rates in clinical trials, its recent announcement that it will acquire YM BioSciences (NYSEMKT: YMI) highlights a lesser-known direction for the company: its oncology pipeline. In this video, Motley Fool health care analyst David Williamson discusses what the acquisition means for Gilead and its aspirations in the oncology field.