NOVA

In part two of a two-part special presentation, NOVA reports on the trials to determine whether the new drug Interleukin-2—the first to make use of the body's own disease-fighting strategy—will live up to its promise as a pivotal cancer breakthrough. Breast cancer claims the lives of four American women every hour. Jane Pauley of NBC News hosts and narrates this NOVA report on stepped-up efforts to reduce the death rate from this all-too-common killer.