subject of attention objectives: Autofluorescence bronchoscopy (AFB).

subject of attention objectives: Autofluorescence bronchoscopy (AFB), when used as an adjunct to standard white light bronchoscopy (WLB) enhances the bronchoscopist's ability to localize small neoplastic lesions, especially intraepithelial lesions. The common study was undertaken in order to define the population in which the rate of detection is higher using AFB.

Design and patients: couple hundred forty-four consecutive patients, who were symptomatic smoker or patients who previously had been treated for lung cancer or head and neck cancers, underwent WLB and AFB. All patients with endoscopic abnormalities underwent biopsies. Data concerning smoking history were prospectively registered.

Results: We report the prevalence of high-grade or invasive lesions at the time of examination. in succession a lesion-by-lesion analysis, 92 low-grade lesions, 42 high-grade lesions (ie, moderate dysplasia, stern dysplasia, and carcinoma in situ), and 39 invasive carcinomas were diagnosed. There was no efficiency of age, gender, and age at smoking initiation forward the prevalence of preinvasive or invasive lesions. The 10 patients who previously had undergone surgery for lung cancer and exhibited high-grade preinvasive lesions had a history of carcinoma of the epidermoid histologic stamp (p = 0.01). These 10 patients displayed multiple lesions in the bronchial tree (mean No. of lesions, 18 by patient). In current smokers, the prevalence of high-grade or invasive lesions were one as well as the other related to the number of pack-years smoking had occurr (p = 001) and to the duration of smoking (p = 001) In contrast, the prevalence of preinvasive lesions in former smoker was related to a history of epidermoid carcinoma.

Conclusions: AFB should be commended in patients with a history of epidermoid carcinomas of the lung instant smokers with a prolonged smoking history appear to comprise a population in which the rate of detection of preneoplastic lesions is high with AFB.

[i]clavis[/i] words: autofluorescence bronchoscopy; early detection; invisible lung cancer

Abbreviations: AFB = autofluorescence bronchoscopy; CIS = carcinoma in situ; WLB = white light bronchoscopy

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Lung cancer is the leading cause of cancer-related death in industrial countries, and cigarette smoking is the main risk factor. principally patients cannot be cured because they current with advanced stages of the disease, and the prognosis remains poor despite therapeutic improvements. Lung carcinoma arises after a series of morphologic and genetic alterations leading to the progression from a normal bronchial epithelium to invasive squamous confined apartment carcinoma. (1) The morphologic changes are fancy to progress from hyperplasia to metaplasia, which are rathercommon reactive lesions, to dysplasia of progressive severity (ie, mild, moderate, and severe) and carcinoma in situ (CIS), which are considered to be conformable to fact premalignant lesions with a high risk of cancer growth (2-5) However, all of these lesions are able to regres including CIS. (67)

It is idea that multiple intraepithelial lesions unravel at various times in patients who have been expos to carcinogens, which supports the idea that the entire bronchial mucosa is damaged by means of carcinogens. This phenomenon is referr to as the field cancerization process

Autofluorescence bronchoscopy (AFB) [LIFE-Lung System; Xillix; Richmond, BC Canada], when used as an adjunct to standard white light bronchoscopy (WLB) enhances the bronchoscopist's ability to localize small neoplastic lesions, especially intraepithelial lesions. (8) In a North American multicenter investigation of AFB (using the LIFE-Lung System) (8) of 173 controls who had undergone 700 biopsies, the relative sensitivity of AFB for lesions classified as moderate dysplasia, morose dysplasia, or CIS improved when compared with WLB alone, resulting in a relative sensitivity of 63 The false-positive rate (034) however, was quite high for the detection of these lesions compared to 010 with WLB alone. This meditation resulted in the approval of LIFE-Lung plan for clinical use by the US fare and Drug Administration. Other reports (9-11) were in agreement with the conclusions of the rife study.

However, contrary ends were obtained in a thought by Kurie et al (12) in which 53 bring under rules who were enrolled in a chemoprevention trial failed to display increased sensitivity with AFB. The application of mind group had > 20 pack-years of smoking however lacked additional risk factors for malignancy as it is as positive sputum cytology findings or airflow obstruction. The bronchoscopic evaluation compared biopsies specimens obtained from six predetermined sites to those from sites of abnormal fluorescence. barely 8 of 245 biopsy specimens (3%) showed metaplasia and/or dysplasia, and there was a poor correlation with suspicious classification by dint of fluorescence. O'Neil and Johnson (13) discussed the discrepancies between these brace studies and pointed out the importance of carefully defining the patient population as well as providing any further subject of attention with comprehensive information about the patient's characteristics, the pack-years of cigarette smoking, and the duration of smoking cessation. Thus, the in every one's mouth study was initiated in order to define the population in which the rate of detection of preneoplastic lesions would be high with AFB.

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