Molecular biology: the polymerase chain reaction.

Upper aerodigestive tract (UADT) cancers provide an excellent carcinogenesis model for a number of reasons: they are accessible to observation, are usually associated with a known environmental carcinogen (tobacco by-products), are sometimes associated with a tumorigenic DNA virus (HPV), and fall along a spectrum of progressive disease from normal mucosa through leukoplakia and verrucous carcinoma to invasive and metastatic carcinoma. Despite the presence of this unique model, the field of head and neck oncology, as a whole, has been slow in establishing an efficient 2-way conduit between the bedside and the laboratory. Such open communication is important as current evidence suggests that future staging and therapy of head and neck tumors will depend not only on familiar macroscopic and light microscopic criteria, but also on factors that are currently identifiable only in the basic science laboratory. To have a significant impact on the direction and relevance of basic research, clinicians should become knowledgeable and conversant in the vocabulary and general concepts of basic science. The goal of this section is to facilitate communication between the basic researcher and the clinician, thereby promoting clinically relevant basic research. This is to be achieved by fostering understanding of the power, limitations, scope, and horizons of current basic research concepts and techniques. Subsequent articles will review current research topics germane to head and neck cancer, such as oncogenes and tumor suppressor genes, mechanisms of metastasis, tumor immunology and its modulation, and virology.