A review of the sciences.

There are few diseases whose names are more emotive than cancer. The reasons for this are plain; its origins are obscure and there is no known universal cure. Each year about 100,000 people in Great Britain die of cancer of one form or another.
In this the first of two programmes dealing with cancer. Horizon looks at the intensive search now going on to discover whether a virus is one of the causes of cancer in humans and at the implications of this search in the treatment for such killer diseases as leukaemia.
(Cancer - The Smoker's Gamble: June 20)