Human Papillomavirus Genotyping and Cervical Smear in Duhok/Iraq
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1 Human Papillomavirus Genotyping and Cervical Smear in Duhok/Iraq Intisar Salim Pity (Professor pathology) MBChB, MSc, FIBMS Hanaa Mohammad Abdo (MSc microbiology) Amer A. Goreal (Microbiology) MBChB, FIBMS
2 Introduction
3 Papillomaviruses comprise an ubiquitous group of viruses known to infect mammals, birds and reptiles, with species and tissuespecificity. The human type (HPV), which targets the stratified squamous epithelia, is one of the most common sexually transmitted infections for both men and women worldwide. This infection is an essential cause of cervical cancer. 3
4 Aims of the study 1. Determine HPV genotypes in Duhok/Iraqi women. 2. Identify the distribution of HPV genotypes in different Pap smear readings 4
5 MATERIALS & METHODS
6 During a period extended from: November September-2016 A total of 64 married women (17-60 Y) who attended the cytologic clinical centers in Duhok/Iraq, were enrolled in the study. 6
7 Two samples were taken from each woman HPV- DNA From endocervical canal with sterile cytobrushes, rinsed in transport buffers & then stored at 2-8 ºC Pap smear From transitional zones, then processed in ThinPrep liquid based devices & stained with Pap stain 7
8 PCR preparation Using the QIAamp Mini Kit (Qiagen, Hilden, Germany), extraction of DNA was performed according to the manufacturer's instruction. For each sample two amplification reactions were run One with medium-high risk primers While the other with low risk primers. PCR Premix and Taq reagents are common to both reactions 8
9 PapillomaStrip kit used was based on the reverse blot technique that allows qualitative detection of 37 anogenital HPVs DNA samples. These Papillomavirus subtypes comprise: Medium-high risk: 16, 18, 26, 31, 33, 35, 39, 45, 51, 52, 53, 56, 58, 59, 66, 68, 69, 73 & 82 Low risk: 6, 11, 40, 42, 43, 44, 54, 61, 62, 67, 70, 71, 72, 74, 81, 83, 84 & 91. 9
10 Thermocycling (PCR program used for amplification of HPV genes) included: Step Temp. Time 1. Initial denaturation 94 C 5 min 1 N0. Of cycle 2. Denaturation 94 C 1 min 3. Annealing 58 C 1 min Extension 72 C 1 min 5. Final extension 72 C 5 min 1 6. Holding step until samples removed 3. C 10
11 Interpretation of Results: 11
12 RESULTS & DISCUSSION 12
13 80.00% 70.00% 60.00% 50.00% 40.00% 30.00% 20.00% 10.00% 0.00% 22.6% 16.10% HPV was detected in 40% HR-HPVs were observed in ~16% of NILM Pap smears. This ascertains the fact that HPV infection can remain silent for a variable period before a serious lesion will develop & may represent the footprints for a serious clinical implication. NILM ~16% 66.70% 18.80% 6.20% 50.00% 50.00% 0.00% 57.10% 50.00% 50.00% HRHPV LRHPV 0.00% NILM ASC-US LSIL ASCH HSIL SCC 13
14 Among cytologically abnormal smears, there was evident increased HR-HPVs with increasing disease severity with a peak at LSIL level, then remained platue. However, our HR-HPV burden rates are considered low when compared with what has been reported among unselected Ethiopians and unscreened Kuwait s women where HR-HPV accounted for > 95% of SCC and HSILs LSIL ASCH HSIL SCC 66.7% 50% 50% 57% 80.00% 70.00% 60.00% 50.00% 40.00% 30.00% 20.00% 10.00% 0.00% HRHPV LRHPV NILM ASC-US LSIL ASCH HSIL SCC 14
15 HPV16 formed the most frequent HR followed by HPV18. Other HR-HPV strains identified included HPV52, HPV66, HPV39, HPV56, HPV31 and HPV % 30.00% 25.00% 20.00% 15.00% 10.00% 5.00% 0.00% HPV16 6 (31.6%) 31.6% HPV18 4 (21.1%) 21.1% 2 (10.5%)2 (10.5%) 2 (10.5%) 1 (5.3%) 1 (5.3%) 1 (5.3%) 15
16 HPV16 was identified in NILM, LSIL & malignant smears. While HPV18 strains were exclusive to the SCC and HSILs. Certain HR types, like HPV52, HPV66, HPV56, HPV39, HPV31 and HPV45, were more likely to be associated in LSIL and lower cytologic abnormalities and in negative cases, rather than HSIL and SCC 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% SCC HSIL ASCH LSIL ASC-US NILM 16
17 LR-HPV HPV71 & HPV6 formed the commonest genotypes 30% 25% 20% 15% 10% 5% 0% 4 (25%)4 (25%) 2 (12.5%)2 (12.5%) 1 (6.25%) 1 (6.25%) 1 (6.25%) 1 (6.25%) 17
18 Only HPV71 was detected in HSIL in addition to ASC-US, & NILM. The remaining LR-HPV genotypes were identified in LSIL, equivocal & lower Pap readings. We failed to identify any LR-HPV among SCC cases 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% HSIL ASCH LSIL ASC-US NILM 18
19 The proportion of Mixed HPV Infection in the present study, 4 (15.3%), appears to be much lower than what has been reported by others who restricted their studies on women complaining of difficult infections resistant to antibiotics & reproductive age groups which are expected to be sexually more active & thus harbor more mixed infections. Higher grades cervical lesions (HSIL, SCC and even ASCH) tended to harbor single (high or low risk) rather than multiple strains. 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 54(LR) 6(LR) 39(HR) 83(LR) 71(LR) 66(HR) 62(LR) 66(HR) 52(HR) 39(HR) 11(LR) 45(HR) 31(HR) NILM NILM ASC-US LSIL LRHPV83 LRHPV71 LRHPV54 LRHPV6 LRHPV11 LRHPV62 HRHPV45 HRHPV31 HRHPV66 HRHPV52 HRHPV39 19
20 Conclusions 1. The higher frequency of HR-HPV than the LR-HPV with identification of 4 mixed cases a strongly indicates that our women are at risk of developing cervical cancer and thus vaccination program has to be launched. 2. HPV 16/18 genotypes contributed the highest proportion of the overall HR-HPV with rising frequency among increasing severity of cervical cytologic abnormality. 20
21 Conclusion cont.. 3. Detection of HR-HPV in ~ 16% of NILM and ~ 19% of ASC-US smears with restriction of some strains to these 2 categories highlights the great value of HPV genotyping as a surrogate virology test to pick up unscreened women at risk of developing cervical cancer particularly in absence of a proper screening program. 21
22 THANK YOU 22
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