Cancer Therapy: A Possible New Approach

Two substances, one promoting growth ( promine ) of ascites tumors in mice and the other inhibiting it ( retine ) have both been found in several tissues, namely, thymus, aorta, muscle, and tendon. In spite of similar solubilities in the solvents used for their extraction, the substances could be roughly separated. The value of the ratio between these substances in the same tissue may be significant.