In general, the wound after the excision of a solid cancer does not heal well. Helicoll®, high purity, bioactive, non-immunogenic type-I collagen successfully heals such wounds after the removal of cancer of oral and skin. For example, one such patient who was not able to open her mouth beyond 10 mm before the treatment resulted in a remarkable clinical outcome to open the mouth easily and freely move the jaws in 4 weeks after Helicoll® application. This beneficial clinical outcome is the exclusive result of patented phosphorylated collagen. Other clinical studies have already proven the infiltration of cells and blood capillaries by neo-vascularization into the Helicoll® matrix on day 4 and 5 after application. Further evidence for the clinical superiority of Helicoll® can be viewed video.