What are some good books on oncology?
You could try DeVita, Hellman, and Rosenberg's Cancer: Principles &amp; Practice of Oncology. It has detailed information on both biological and clinical aspects of cancer. Apparently, the publishers regularly release online updates to cover the latest developments in oncology.

Reference to the current edition:

DeVita VT, Rosenberg SA, Lawrence TS, editors. DeVita, Hellman, and Rosenberg's cancer: principles &amp; practice of oncology. 11th Edition. Philadelphia: Wolters Kluwer; 2018. 2432 p.