The measurement of DNA ploidy has been used as a tool to try to determ
ine the prognosis of many neoplasms. DNA ploidy can be determined by f
low cytometry or image analysis of a tumor. In squamous carcinomas of
the head and neck, a poorer prognosis has been associated with nondipl
oid tumors. Similar results have been obtained from studies of salivar
y gland neoplasms. The role of DNA ploidy as a provider of independent
information has yet to be determined. With rarer head and neck tumors
, measurement of tumor ploidy has yet to be established as a valuable
adjunct to routine light microscopic study.