Fluorescence and Reflectance Spectroscopy During Colposcopy in Detecting Cervical Intraepithelial Neoplasia and Dysplasia in Healthy Participants With a History of Normal Pap Smears

OBJECTIVES: * Identify potential improvements in noninvasive methods of diagnosing dysplasia and neoplasia of the cervix using fluorescence and reflectance spectroscopy in healthy participants with a history of normal pap smears. * Determine the reflection and fluorescence spectra of in vivo samples of the normal human cervix. * Refine the detection of cervical lesions by fluorescence spectroscopy in these participants using improved classification of normal columnar tissue and non-neoplastic tissue with inflammation. * Determine and validate the wavelength selections for spectroscopic diagnosis derived from in vitro measurements from these participants. * Compare specific tissue sections from these participants with their excitation-emission matrices in order to identify the cell types contributing to the signal. OUTLINE: Participants undergo placement of a fiber optic probe on one normal columnar cell site and one normal squamous cell site of the cervix during colposcopy\*. The probe delivers laser light at a specific excitation wavelength and collects fluorescence from the entire emission wavelength range from the mucosa. Participants undergo biopsies of both sites. NOTE: \*The columnar epithelium will not be colposcopically visible in all patients, in which case 2 normal squamous sites will be measured PROJECTED ACCRUAL: A total of 1,000 participants will be accrued for this study.