Challenge: Science Against Cancer (Canada Dept. of Health & Welfare, US Nat'l Cancer Inst., 1950)
This film attempts to explain why researchers are having a difficult time discovering the causes and cures for cancer. It begins with an overview of the birth of man from one cell and generally explores the complexity of the human body. It shows the isolation and testing of cancer cells and explains the effects of heredity and environment on normal cells. It explains the difficulties of tracing several generations for heredity research and the multitude of chemicals, etc. which affect cells and turn them cancerous.