ConventionalPap smearand liquid based cytology for cervical cancer screening - a comparative study

A Comparison of Conventional Pap Smear and Liquid-Based Cytology for Cervical Cancer Screening

Objectives

Early diagnosis and treatment of preinvasive lesions have made cervical cytology one of the most effective methods of cancer screening in industrialized nations, which have seen a sharp decline in the incidence and death of invasive cancer. The aim of this study is to compare liquid-based cytology (LBC) and conventional Pap on cervical smears.

Materials and Methods

From July 2018 to June 2022, 600 patients were included in this cross-sectional study, which was done at the Pathology Department of a Tertiary Care Facility in Western Maharashtra.

Results

Of the 600 patients, 570 (95%) had good conventional Pap smear (CPS), whereas 30 (5%) had poor ones. Five hundred and ninety-two (98.6%) LBC smears were satisfactory, whereas 8 (1.4%) were unsatisfactory. Endocervical cells were seen in 294 (49%) CPS, whereas 360 (60%) LBC smears showed endocervical cells. The morphology of inflammatory cells was similar in both techniques. Hemorrhagic background was seen in 212 (35%) CPS and 76 (12.6%) LBC smears. Only two samples showed diathetic background, which was seen on both CPS and smear. Out of the satisfactory smears in the case of CPS, 512 (85%) cases were reported as negative for intraepithelial lesion or malignancy (NILM), whereas 58 (9.7%) cases were reported as epithelial cell abnormality. In LBC smears, 526 (87.3%) were reported as NILM, whereas 66 (11%) were reported as epithelial cell abnormality. Organisms were detected in 208 (34%) CPS and 162 (27%) LBC smears. Screening time was 5 ± 1 min for CPS, whereas it was 3 ± 1 min for LBC smear.

Conclusion

Mortality will be decreased using LBC on a bigger scale in nations where many smears can be made and screened in a short amount of time, with the provision of doing human papillomavirus-based testing on the remaining sample.

Comparative evaluation of conventional cytology and a low-cost liquid-based cytology technique, EziPREP™, for cervicovaginal smear reporting: A split sample study

Background:

Liquid-based cytology (LBC) for cervical cancer screening offers several advantages over conventional cytology. However, the extremely high cost of the current approved devices precludes widespread application of LBC technique in resource-constrained countries. This study aimed to evaluate the performance of an indigenous low-cost LBC technique, EziPREP™ (EP), against conventional preparations (CPs) for cervical cancer screening.

Materials and Methods:

A cross-sectional split-sample study with consecutive cervical sampling was conducted on 515 women attending the clinic at our institute. CP smears were prepared as per the standard technique using spatula and endocervical brush followed by detaching the head of brush into the fixative vial of EP. The EP samples were processed as per the manufacturer's protocol. Both CP and EP smears were stained using standard Papanicolaou stain protocol. Both sets of smears were evaluated for staining quality, morphologic details, and cytologic diagnoses. Cytologic diagnoses were correlated with cervical biopsy findings, wherever available. Performance characteristics of the two techniques were calculated.

Results:

The unsatisfactory rate for CP was 1.0%, while on EP, 1.3% smears had inadequate cellular material. The staining quality and morphological details were comparable in both sets of smears. The detection of infections and epithelial cell abnormality was more, though not statistically significant in EP smears. There was a 98% concordance in cytologic diagnosis between CP and EP smears. Cytohistologic concordance was observed in 96% of cases for both CP and EP smears. Although the time taken for processing and staining of smears was higher for EP (2.5 min for EP per smear and 1.6 min for CP per smear), the screening time reduced from 6.5 min per smear for CP to 2.2 min in EP smears.

Conclusion:

EP provides monolayered cervical smears with vivid morphological details, leading to reduced screening time and relatively higher pick-up of infections and low-grade cervical lesions as compared to conventional smears. The availability of such low-cost devices may enable wider application of cytology-based cervical cancer screening in low-resource countries.

Comparison of cervical cancer screening by visual inspection with acetic acid versus cervical-cytology in pregnancy

Aims: The aim of this study was to compare visual inspection with acetic acid (VIA) with cervical cytology for cervical cancer screening in pregnant women. Settings and Design: A prospective cohort study was conducted after institutional ethical committee approval in a tertiary care hospital in Northern India. Pregnant women of gestational age <28 weeks were randomly recruited from the antenatal clinic. Subjects and Methods: All eligible women had a Pap smear followed by VIA; colposcopy was performed if either test was positive. Swede score was used for grading of the acetowhite lesion; biopsy was planned if Swede score was ≥8. Statistical Analysis Used: The sensitivity, specificity, and predictive values for both screening methods were compared with colposcopy as the reference standard. Results: There were 370 low-risk pregnant women in the age group of 20–36 years in the study with a mean parity was 2.1, and the median period of gestation of 14.6 weeks. Abnormal Pap cytology was seen in 5.9% (n = 22) of patients; the abnormalities were ASCUS in 13 (59%), LSIL in 4 (18.2%), and AGC-NOS in 5 (22.7%) patients. VIA positivity was found in 8.4% (n = 31). The positive predictive value was 31.8% for cervical cytology and 48.4% for VIA (P = 0.001). No invasive lesion was detected. Positive predictive value of VIA was significantly higher than Pap cytology for detection of abnormal lesions. Conclusions: VIA is a cost-effective method with better predictive value than Pap smear for cervical cancer screening in pregnant women.

Exploration of treatment strategies for normal cytology smears with reactive cellular changes

OBJECTIVE

To evaluate the use of high-risk humanpapillomavirus (HR-HPV) DNA testing in women who have normal cytology result with reactive cellular changes to identify high risk patients of developing precancerous cervical lesions and cervical cancer.

STUDY DESIGN

Outpatient patients with normal liquid-based cytology (LCT) results showing reactive cellular changes (case group, n=1085) and normal LCT without reactive cellular changes (control group, n=1085) were recruited from cervical clinics at the International Peace Maternity & Child Health Hospital from January 2012 to December 2013. The HPV status and cervical biopsy pathology results were analyzed.

RESULTS

The HR-HPV positive rate of the case group (598/1085) was higher than that of the control group (163/1085) (P<0.001). HR-HPV prevalence among CIN1, CIN2, CIN3 and cervical cancer was 73%, 87%, 100%, and 100% respectively (P<0.05). In patients with positive HR-HPV results, more CIN2+ were found significantly in case group (37/598) than those in control group (3/163), P=0.027. The sensitivity of diagnosis of CIN2+ lesions by HR-HPV testing was 92.5%, the specificity was 36%, the positive predicted value was 8.6%, and the negative predictive value was 98.6%. The incidence of CIN2+ lesions was not different among different age groups (P>0.05).

CONCLUSION

Reactive cellular changes in normal cervical smears should be further investigated. HR-HPV testing could be used as an effective triage in cases of reactive cellular changes. Colposcopy is recommended for those cases showing reactive cellular changes combined with HR-HPV positivity to reduce the risk of failure to diagnose cervical cancer and precancerous lesions.

Comparison of cervical cell morphology using two different cytology techniques for early detection of pre-cancerous lesions

Cervical cancer is an issue of foremost importance globally, specifically affecting the developing nations. Significant advances have taken place with regard to diagnosis of cervical cancer, especially with screening. Appropriate screening measures can thus reduce the incidence of cervical cancer. The most desirable screening technique should be less invasive, easy to perform, cost-effective and cover a wide range of diagnostic icons. Manual liquid based cytology (MLBC) can be considered as one of the suitable technique for screening with the above-mentioned benefits. The aim of the current study was to compare two cervical screening techniques on the basis of different morphological parameters and staining parameters by using modified acetic acid Pap staining to see the possibility of reducing time economy involved in conventional Pap staining (CPS). The study was conducted on a total 88 cases and all were analyzed with both MLBC and CPS. Forty eight cases that were regarded as satisfactory on the basis of Bethesda system by both methods were further recruited for investigation. Their morphological parameters and staining quality were compared and scored according to a scoring system defined in the study. Quality indices was calculated for both staining procedures and smear techniques.

Primary study on providing a basic system for uterine cervical screening in a developing country: analysis of acceptability of self-sampling in Lao PDR

BACKGROUND

Most developing countries have been unable to implement well-organized health care systems, especially comprehensive Pap smear screening-based programs. One of the reasons for this is regional differences in medical services, and a low-cost portable cervical screening system is necessary. To improve regional discrepancies in cervical screening systems, we investigated the usefulness and acceptability of cervical self- sampling by liquid-based cytology (LBC) for 290 volunteers in the Lao PDR.

MATERIALS AND METHODS

Following health education with comprehensive documents, cervical self-sampling kits by LBC were distributed in three provincial, district, and village areas to a total of 290 volunteers, who were asked to take cytology samples by themselves. Subsequently, the acceptability of self-sampling was evaluated using a questionnaire.

RESULTS

The documents were well understood in all three regions. Regarding the acceptability of self-sampling, the selections for subsequent screening were 62% self-sampling, 36% gynecologist-sampling, 1% either method, and 1% other methods. The acceptability rates were higher in the district and the village than in the province. For the relationship between acceptability and pregnancy, the self-sampling selection rate was higher in the pregnancy-experienced group (75%) than in the pregnancy-inexperienced group (60%). For the relationship between selection of self-sampling and experience of screening, the self-sampling selection rate was higher in the screening-inexperienced group (62%) than in the screening-experienced group (52%).

CONCLUSIONS

Our data show that this new way forward, involving a combination of self-sampling and LBC, is highly acceptable regardless of age, educational background, and residence in rural areas in a developing country.

Manual liquid based cytology in primary screening for cervical cancer--a cost effective preposition for scarce resource settings

Conventional pap smear (CPS) examination has been the mainstay for early detection of cervical cancer. However, its widespread use has not been possible due to the inherent limitations, like presence of obscuring blood and inflammation, reducing its sensitivity considerably. Automated methods in use in developed countries may not be affordable in the developing countries due to paucity of resources. On the other hand, manual liquid based cytology (MLBC) is a technique that is cost effective and improves detection of precursor lesions and specimen adequacy. Therefore the aim of the study was to compare the utility of MLBC with that of CPS in cervical cancer screening. A prospective study of 100 cases through MLBC and CPS was conducted from October 2009 to July 2010, in a Medical College in India, by two independent pathologists and correlated with histopathology (22 cases). Morphological features as seen through MLBC and CPS were compared. Subsequently, all the cases were grouped based on cytological diagnosis according to two methods into 10 groups and a subjective comparison was made. In order to compare the validity of MLBC with CPS in case of major diagnoses, sensitivity and specificity of the two methods were estimated considering histological examination as the gold standard. Increased detection rate with MLBC was 150%. The concordance rate by LBC/histopathology v/s CPS/histopathology was also improved (86% vs 77%) The percentage agreement by the two methods was 68%. MLBC was more sensitive in diagnosis of LSIL and more specific in the diagnosis of inflammation. Thus, MLBC was found to be better than CPS in diagnosis of precursor lesions. It provided better morphology with increased detection of abnormalities and preservation of specimen for cell block and ancillary studies like immunocytochemistry and HPV detection. Therefore, it can be used as alternative strategy for cervical cancer prevention in limited resource settings.