Inside Cancer: Multimedia Guide to Cancer Biology -- Covers 4 parts: Hallmarks of Cancer; Causes and Prevention; Diagnosis and Treatment; Pathways to Cancer. Each part uses slides, illustrations, and animations, accompanied by audios.
NCI Visuals Online -- National Cancer Institute's Visuals Online currently provides public access to 2,822 images. Each image or illustration included in the NCI Visuals Online Web site is labeled either "Public Domain" (free to use) or "Copyright Protected" (restricted, obtain permission before use).
Winslow, T. (2013). Lobectomy. National Cancer Institute, NCI Visuals Online