Relationships between CD32 positive fraction, viable tumor volume and growth rates of EMF treated tumors. A. The significant, linear relationship between the CD 31 positive fraction and the viable tumor volume of tumors. B. The non-significant relationship between the CD 31 positive fraction and the growth rate of the tumors. Taken together, these data illustrate that blood supply (CD 31 positive fraction) is critical for tumor viability but is not related to tumor growth.