In his work The Metabolism of Tumors, he demonstrated that all forms of cancer are characterized by two basic conditions: acidosis and hypoxia (lack of oxygen).
Encwadini yakhe ethi The Metabolism of Tumors, ukuvezile ukuthi zonke izinhlobo zomdlavuza zibonakaliswa yizimo ezimbili eziyisisekelo: i-acidosis ne-hypoxia.