US Oncology has got the backs (and the back offices) of more than 1,000 oncologists across the US. Operating as The US Oncology Network, the firm provides management and support services to hundreds of oncology practices and radiation treatment centers; it also operates scores of fully integrated cancer centers. The company's range of management services includes billing, recruiting, data management, purchasing, and accounting. It also offers separate drug supply services, including purchasing negotiations and distribution, for specialty cancer drugs. US Oncology is the primary operating entity of McKesson Specialty Health, a division of drug distribution giant McKesson.