ABSTRACT
Diseases collectively grouped under the term cancer remain a leading and devastat ing cause of morbidity and mortality throughout the world (1,2). In the United States alone, more than 1,170,000 cases of cancer will be diagnosed in 1993, and another 515,000 persons will die from the disease (3). Cancer kills more children aged 1 to 14 than does any other disease, and almost 85,000,000 Americans now living will eventually get cancer. Obviously, these numbers are in reality probably higher, because not every case of cancer is diagnosed and not every death from cancer is so attributed (4). Unfortunately, trends in certain common tumor sites, including lung and respiratory tract, are upward (5,6).
