The cancer cell diffusion (Abbr: CCD) is the main reason for death of cancer patient after the cancer surgery. The project to find a method to prevent the CCD is the big challenge to the medical scientists. There is no much progress.

Followings are the report of this theoretical research of the project: The potential function of the blood capillary was founded. It is the basis for further research. A substance, Histamine was found as the key substance for the CCD. Many phenomena related to the CCD were explained with the characteristic of the Histamine. How the CCD happened in detail and how the Histamine played the key role are introduced. This information is the important reference for sourcing medicine. A medicine was proposed for purpose to prevent CCD. It is predicted that if the cancer surgery combines with the medicine taking before the surgery, the CCD might be prevented. Besides, the methods looking for other medicines are suggested The research works with their results will be presented at the meeting.