Another very early type of surgery used to treat cancer was written about in the 1020s. In "The Canon of Medicine", Avicenna (Ibn Sina) said that treatment should involve cutting out all diseased tissue. This included the use of amputation (removing a part of the body completely) or removing veins that ran in the direction of the tumor. Avicenna also suggested that the area that had been treated should be cauterized (or burned) if needed.