After the founding of the Puerto Rican League Against Cancer in 1938 and during his career, Dr. González Martínez contemplated the need to create a specialized hospital to fight cancer, which the Betances Association considered that their hospital should be established next to the Puerto Rican League Hospital, but when they did not achieve their purpose, they joined forces for the benefit of the country. From there the agreement with the League arises, making delivery of all its cash capital and bonds of the Government of the United States amounting to $100,000.00. This amount was given to the Puerto Rican League, allowing the purchase of a piece of land in Hato Rey, at stop 34 between Ponce de Leon and Muñoz Rivera Avenue.