A sequence of lectures reexamines cancer as a systemic disorder rooted in metabolic imbalance and influenced by diet and mode of life, rejecting parasitic causation and challenging exclusive reliance on surgical removal. The author reviews patterns of occurrence, metabolic and dietary relations, and clinical evidence, criticizes the common failure to provide medical care before and after operations, and proposes preventive and therapeutic principles based on clinical observation and physiological reasoning. The text pairs practical medical-management suggestions with discussion of surgical measures and concludes with bibliographic references and clinical conclusions.