ABSTRACT
A new modification method for glass slides was developed and applied to make ThinPrep Pap smears,in order to increase the adhesion ability of cervical exfoliative cells.3-glycidyloxypropyl trimethoxysilane (GOPS) was coated on the glass slides firstly on the slides,then poly-L-lysine (PLL)was covalently modified onto the above epoxy-terminated slides to form GOPS-PLL double decorated slides.The modified slides were characterized using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM).The cell adhesion ability effect was tested and compared with traditional PLL coated slides by fixing the cervical exfoliative cells on the double adorned slides.The control test was conducted by the bare glass slides unmodified.The cell morphology of cervical exfoliative cells adhered on different slides was observed under the microscope after Papanicolaou staining.The number of cervical exfoliative cells on the unmodified slides,PLL coated slides and GOPS-PLL coated slides was 1030±300,3283±226 and 4119±280 (n=12),respectively.The data among the three different modification methods showed significant differences (one-way analysis of variance,ANOVA test,P＜ 0.05).The cell capturing effect of the GOPS-PLL slide was the best among the three different modified slides.In addition,the GOPS-PLL slide could enhance the uniformity of the adhered cells and be widely applied to the ThinPrep system for cervical carcinoma screening to increase the accuracy rate of diagnosis.
ABSTRACT
OBJECTIVE: To compare the conventional Pap smear with the ThinPrep Pap smear in detecting HSIL and invasive cervical cancer and to determine the clinical value of ThinPrep Pap smear. METHODS : We evaluated the Pap smear results of 2933 patients. These subjects were selected from women having visited the early cancer clinic of the department of Obstetrics and Gynecology, Chonnam University Hospital, from Jan. 1998 to Dec. 2000. Of 2933 patients, conventional Pap smear and ThinPrep Pap smear were performed in 1594 and 1339 cases respectively. According to the results, sensitivity, specificity, positive predictability and negative predictability of both tests were compared and analyzed. RESULTS: In detecting HSIL and invasive cervical cancer, the conventional Pap smear examinations showed sensitivity 62.0%, specificity 96.5%, positive predictability 87.7%, and negative predictability 86.3%, while ThinPrep Pap smear did sensitivity 85.1%, specificity 98.3%, positive predictability 97.4% and negative predictability 89.7%. CONCLUSION: ThinPrep Pap smear makes it possible to obtain better specimen by reducing probable mistakes in sampling, and which can result in decreasing the rate of false negativity of Pap smear and increasing the accuracy of the Pap smear examination. Therefore, ThinPrep pap smear is a useful method in raising detection rate of HSIL and invasive cervical cancer.