After struggling for years to improve the treatment of cancer, scientists now hope to fight the disease with the help of the same techniques that deciphered the human genome eight years ago: mapping it. Traditionally, researchers have started with a fuzzy premise about which toxic drugs might kill tumors and then tested those drugs in the lab, in animals and, finally, in human subjects. This helps explain why some 35 years after Richard Nixon declared a "war on cancer," there has been only limited progress in the treatment of most of the 200 cancers that afflict humans. Health Salon: Scientists may have cured cancer (last week). Don't believe them? We don't either!ExpressIndia: The genetic secrets of cancer 'unlocked': Study.