Abstract
Objective: In this prospective, population-based study, we evaluated the utility of high-risk human papillomavirus (HR-HPV) genotyping for triaging women with atypical squamous cells of undetermined significance (ASC-US) in the Chinese rural area.
Methods: A total of 40,000 women were recruited from rural areas of Shanxi Province, China, between June 2014 and December 2014. Women with Pap results of ASC-US underwent HPV genotyping, colposcopy and histopathological examination. For those with normal cervixes or cervical intraepithelial neoplasia (CIN) 1 on the initial evaluation, a 2-year follow-up study was performed.
Results: The reporting rate of ASC-US was 5.76% (2,304/40,000) in the study population. The detection rates of CIN 2 or above (CIN2+) and CIN 3 or above (CIN3+) in women with ASC-US were 7.28% and 1.75%, respectively. HPV 16 (39.53%), HPV 58 (17.83%), and HPV 52 (15.50%) were the three most prevalent HR-HPV genotypes among all women with ASC-US cytology. The five most common HR-HPV genotypes in CIN3+ lesions were HPV16, HPV58, HPV33, HPV31 and HPV18. Compared with the 15 HR-HPV testing, genotyping for a combination of HPV16/18/31/33/58 increased specificity significantly with virtually no loss of sensitivity for detecting CIN2+ and CIN3+ lesions, as well as significantly reduced colposcopy referral rate (23.15% vs 33.70%, p<0.01). In addition, in the 2-year follow-up period, women with infection of HPV16, 18, 31, 33 or 58 genotypes were the most likely population (92%, 23/25) to develop CIN2 lesion.
Conclusion: Our results demonstrate that genotyping for a combination of HPV16/18/31/33/58 provides a more efficient and cost-effective model to risk-stratify women with ASC-US in the Chinese rural population.
Keywords: Human Papillomavirus (HPV) genotyping, Atypical Squamous Cells of Undetermined Significance (ASC-US), cervical cancer screening, Pap test, cervical intraepithelial neoplasia
Introduction
Atypical squamous cells of undetermined significance (ASC-US) cytology is the most frequent abnormal interpretation on cervical Papanicolaou (Pap) test, accounting for ~5% of all cervical cytology in the western population 1-3 and 3-5% in Chinese population 4-6. The management of women with ASC-US remains a clinical challenge, due to the equivocal cytology and variable underlying process from human papillomavirus (HPV)-unrelated, non-neoplastic conditions to the HPV-related cervical intraepithelial neoplasia (CIN) and carcinomas. Earlier studies have found that 3-36% of women with ASC-US cytology will have underlying CIN2 or more severe lesion (CIN2+) 7-9, and only a small percentage of ASC-US associated with cervical intraepithelial neoplasia 3 or worse (CIN3+) can be detected by follow-up colposcopic examination. Therefore, many efforts have been made trying to identify those who have cancer and significant precancerous lesions among women with ASC-US cytology, in order to improve the efficacy of screening and reduce the number of unnecessary colposcopic examination.
Based on the published evidence, the American Society for Colposcopy and Cervical Pathology (ASCCP) Guidelines have recommended women with an ASC-US cytology result should have a reflex HPV testing, and an immediate colposcopy referral or conservative follow-up based on patients' previous screening history is recommended for women with high-risk (HR) HPV-positive ASC-US 10, 11. Currently, the widely-used, US Food and Drug administration (FDA)-approved HPV testing platforms are largely pooled HR-HPV tests, which include 13 or 14 of the most common high-risk genotypes (16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 68 and/or 66). However, the risk of progression to cervical cancer and CIN varies substantially among individual carcinogenic genotypes 12, 13. It has been reported that women with HPV16 or HPV18 positive ASC-US had approximately twice the risk of CIN3+ as women with ASC-US and high-risk HPV types other than 16 and 18 2, 14, 15. Thus, type-specific HPV identification appears to be a reasonable strategy to improve risk stratification of women with ASC-US and to reduce the colposcopy burden. This approach has been supported by the launches of additional HPV genotype 16, 18 and /or 45 in the recent FDA-approved Cobas 4800, Aptima and Onclarity tests.
It is well-known that the HR-HPV prevalence and distribution varies geographically worldwide. There are some distinctive characteristics in the Chinese population, including more frequent HPV52 and HPV58 genotypes, and less HPV45 and HPV18 genotypes in cervical cancer and precancerous lesions 16. In order to evaluate whether selection of certain HPV genotypes may be more efficient and cost-effective for the risk management of women with ASC-US in the Chinese rural population, in this study, we report the results of baseline and 2-year follow up of HPV genotyping and histologic correlation in 2,304 women with ASC-US cytology, from a large population-based cervical cancer screening program and a prospective cohort in the rural areas of Shanxi province, China.
Materials and Methods
Study population
The study design and methods have been described previously 17, 18. Briefly, we conducted free cervical cancer screening tests for eligible women who were permanently residing in two counties (Yangqu and Jiexiu) of Shanxi Province between June 2014 and December 2014. A total of 40,000 women aged 19-65 years completed an epidemiological questionnaire on potential risk factors for CIN and the Pap test. Women with Pap results of ASC-US underwent HPV genotyping, colposcopy and histopathological examination.
In Yangqu County, 1,034 women with ASC-US cytology were identified and 1,026 women underwent HPV baseline genotyping and immediate histopathologic examination. 77 women were diagnosed with CIN2 or worse including 4 squamous cell carcinomas on the histologic examination and all these patients received clinical treatment. 949 women were found to have normal cervixes or CIN1 and were followed-up for additional 2 years (Figure 1).
Figure 1.
Flow diagram of participants in Yangqu County. Abbreviations: ASC-US, atypical squamous cells of undetermined significance; CIN, cervical intraepithelial neoplasia; HPV, human papillomavirus; LBC, liquid based cytology; NILM, negative for intraepithelial lesion or malignancy.
Among 1,270 women with ASC-US cytology in Jiexiu County, 382 patients with normal cervix refused to have HPV genotyping test. 90 women with CIN2 or worse lesions received clinical treatment, while 798 women with normal or CIN1 lesion were followed-up for additional 2 years (Figure 2). All inspections and detections were implemented under double-blind conditions. The study was registered in the Chinese Clinical Trial Register (ChiCTR), registration number: ChiCTR-ROC-15006479. The study protocol and informed consent form were reviewed and approved by the Ethics Committee of Second Hospital of Shanxi Medical University.
Figure 2.
Flow diagram of participants in Jiexiu County. Abbreviations: ASC-US, atypical squamous cells of undetermined significance; CIN, cervical intraepithelial neoplasia; HPV, human papillomavirus; LBC, liquid based cytology; NILM, negative for intraepithelial lesion or malignancy.
Cytology testing
The liquid-based cytology (LBC) method was used in this study. The LBC preparation was produced by Lituo Biotechnology Corp. (Hunan, China; http://www.lituo.com. cn). The cytological evaluation was performed by two cytopathologists at The Second Hospital of Shanxi Medical University. Cytology results were classified using the 2001 TBS criteria for reporting cervical cytology 19. The cases with an interpretation of ASC-US or a worse condition were further reviewed by a senior cytopathologist who was blinded to the results. Ten percent of cases with a negative report were reviewed by another pathologist to provide quality control.
HPV genotyping
HPV genotyping was performed on the residual Pap test specimens using flow-through hybridization and a HybriMax gene chip (HybriBio Biotechnology Ltd, China). HybriBio GenoArray test is a commercially-available HPV genotyping diagnostic assay, and was approved by Conformitè Europèenne In Vitro Diagnostic (CE-IVD). Earlier studies have demonstrated the overall agreement in HR-HPV detection between HybriBio GenoArray genotyping assay and HC2 was 92.5-92.9% with a kappa value of 0.814 and 0.80 20, 21. All detection procedures were performed according to the manufacturer's instructions, as described previously 22. Twenty-one HPV genotypes were included in this testing platform, including 15 HR-HPV genotypes (HPV16, 18, 31,33, 35, 39, 45, 51, 52, 53, 56, 58, 59, 66 and 68) and 6 low-risk HPV (LR-HPV) genotypes (HPV6, 11, 42, 43, 44 and CP8304 (81)).
Colposcopy and histological examination
The colposcopy procedure and biopsy were performed by experienced gynecological specialists from The Second Hospital of Shanxi Medical University. The average time from Pap sampling to colposcopy was 15 days (range: 3-62 days). Colposcopy examinations were performed using the Preventive Oncology International microbiopsy protocol. During the colposcopy, the cervix was divided into quadrants and each quadrant was examined independently. All visually abnormal areas were biopsied. Quadrants with normal colposcopic impressions were biopsied at the squamocolumnar junction (“random biopsy”). Women with abnormal cytology results and negative or inadequate colposcopic findings underwent endocervical curettage (ECC). All histological slides were reviewed by two gynecological pathologists, who were blinded to the cytology results at The Second Hospital of Shanxi Medical University. Immunohistochemistry for p16INK4A (p16) (ZM-0205, ZSGB-BIO, Peking, China) was utilized in adjudicating the diagnosis. If the two pathologists disagreed on the diagnosis, a third senior pathologist reviewed the slides, and some difficult or equivocal cases were considered for the pathology panel consensus diagnosis.
Statistical analysis
The statistical analysis was performed using the Statistical Package for the Social Sciences (SPSS) version 22.0 software for windows (SPSS Inc., Chicago, IL, USA). Chi-squared test or Fisher's exact test were used for the categorical variables. Statistical tests were two-sided, and P <0.05 was considered statistically significant.
Results
HPV prevalence in women with ASC-US Pap test
Among 40,000 women in this study population, the overall ASC-US rate was 5.76% (2,304/40,000), including 5.17% (1,034/20,000) in Yangqu County and 6.35% (1,270/20,000) in Jiexiu County. Of 2,304 women with ASC-US cytology, 2,296 women underwent colposcopy and immediate histopathologic examination. Histology confirmed that 1,667 patients (72.60%) had normal cervixes, 462 (20.12%) had CIN1, 127 (5.53%) had CIN2, 27 (1.18%) had CIN3, and 13 (0.57%) had squamous cell carcinoma (SCC). The detection rates of CIN2+ and CIN3+ in women with Pap results of ASC-US were 7.28% and 1.75%, respectively.
Of 2,296 women with histologic examination, 1,914 women had HPV genotyping test. Table 1 shows the relative frequencies of HPV infections in women with ASC-US Pap test according to histological diagnosis. The overall rates of HR-HPV and LR-HPV infections were 33.70% (645/1,914) and 1.83% (35/1,914). Among 645 women with HR-HPV infection, 445 patients were infected with a single HPV genotype and 200 patients were infected with multiple HPV genotypes including 20 patients co-infected with low-risk HPV genotypes. The prevalence of HR-HPV genotypes in women diagnosed with <CIN2, CIN2, CIN3 and SCC was 29.36%, 73.23%, 96.30% and 100%, respectively. LR-HPV infections alone, without HR-HPV infections, were not detected in any of the CIN3 and above cases.
Table 1.
HPV prevalence in women with ASC-US cytology according to histologic diagnosis
| Histology | Yangqu County | Jiexiu County | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|
| No | HR-HPV n,% | LR-HPV n,% | No | HR-HPV n,% | LR-HPV n,% | No | HR-HPV n,% | LR-HPV n,% | |
| <CIN2 | 949 | 340 (35.83) | 19 (2.00) | 798 | 173 (21.68) | 11 (1.38) | 1,747 | 513 (29.36) | 30 (1.72) |
| CIN2 | 60 | 46 (76.67) | 1 (1.67) | 67 | 47 (70.15) | 4 (5.97) | 127 | 93 (73.23) | 5 (3.94) |
| CIN3 | 13 | 12 (92.31) | 0 (0.00) | 14 | 14 (100.00) | 0 (0.00) | 27 | 26 (96.30) | 0 (0.00) |
| SCC | 4 | 4 (100.00) | 0 (0.00) | 9 | 9 (100.00) | 0 (0.00) | 13 | 13 (100.00) | 0 (0.00) |
| Total | 1,026 | 402 (39.18) | 20 (1.95) | 888 | 243 (27.36) | 15 (1.69) | 1,914 | 645 (33.70) | 35 (1.83) |
Note: 15 were co-infected with low-risk HPV genotypes (13 in <CIN2 and 1 in CIN2) in Yangqu County; 5 were co-infected with low-risk HPV genotypes (1 in <CIN2 and 4 in CIN2) in Yangqu County.
Abbreviations: ASC-US, atypical squamous cell of-undetermined significance; CIN, cervical intraepithelial neoplasia; HR-HPV, high-risk human papillomavirus; LR-HPV, low-risk human papillomavirus; SCC, squamous cell carcinoma.
The median age of women with ASC-US was 51 years (range: 20-65 years) in Yangqu County and 50 years (range: 20-65 years) in Jiexiu County. Table 2 presents age-stratified HR-HPV prevalence in women with ASC-US cytology. Among all age groups, women aged between 30 and 39 years had peak rate of HR-HPV infection in Yangqu (58.2%, 71/122) and Jiexiu (31.4%, 38/121) Counties. There was a dramatic decline in the HR-HPV infection rates after age 50 in both Counties.
Table 2.
Age-stratified HR-HPV prevalence in women with ASC-US cytology
| Age | Yangqu | Jiexiu | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Case No | Positive | % | Case No | Positive | % | Case No | Positive | % | |
| 20-29 | 21 | 10 | 47.6 | 29 | 8 | 27.6 | 50 | 18 | 36.0 |
| 30-39 | 122 | 71 | 58.2 | 121 | 38 | 31.4 | 243 | 109 | 44.9 |
| 40-49 | 309 | 174 | 56.3 | 284 | 83 | 29.2 | 593 | 257 | 43.3 |
| 50-59 | 449 | 120 | 26.7 | 361 | 90 | 24.9 | 810 | 210 | 25.9 |
| 60-65 | 125 | 27 | 21.6 | 93 | 24 | 25.8 | 218 | 51 | 23.4 |
| Total | 1,026 | 402 | 39.2 | 888 | 243 | 27.4 | 1,914 | 645 | 33.7 |
Abbreviations: ASC-US, atypical squamous cells of undetermined significance.
Prevalence of different HR-HPV genotypes in women with ASC-US Pap test
In women with multiple infections, HPV genotypes were reported separately. The prevalence of HR-HPV genotypes in HR-HPV-positive cervical lesions in Yangqu County are presented in Table 3A. HPV16 (35.57%) was the most common HR-HPV genotype, followed, in order of decreasing frequency, by HPV52 (19.65%), HPV58 (17.91%), HPV53 (8.21%), HPV56 (6.97%), and HPV33 (6.97%). Additionally, HPV18 (4.48%) was in the 11th position. The distribution of HR-HPV genotypes by histologic outcome was different. HPV16 showed an increasing prevalence with the severity of the histological diagnosis (30.88% in <CIN2, 54.35% in CIN2, and 81.25% in CIN3+). HPV58 was the second-most prevalent genotype in CIN2+ lesions and the third-most prevalent genotype in <CIN2 lesions.
Table 3A.
Prevalence of HR-HPV genotypes in HR-HPV-positive cervical lesions in Yangqu County
| HR-HPV genotypes |
<CIN2 (n=340) | HR-HPV genotypes |
CIN2 (n=46) | HR-HPV genotypes |
CIN3+ (n=16) | HR-HPV genotypes |
Total (n=402) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No | % | No | % | No | % | No | % | ||||
| HPV16 | 105 | 30.88 | HPV16 | 25 | 54.35 | HPV16 | 13 | 81.25 | HPV16 | 143 | 35.57 |
| HPV52 | 72 | 21.18 | HPV58 | 8 | 17.39 | HPV58 | 3 | 18.75 | HPV52 | 79 | 19.65 |
| HPV58 | 61 | 17.94 | HPV52 | 7 | 15.22 | HPV31 | 2 | 12.50 | HPV58 | 72 | 17.91 |
| HPV53 | 33 | 9.71 | HPV31 | 5 | 10.87 | HPV33 | 2 | 12.50 | HPV53 | 33 | 8.21 |
| HPV56 | 23 | 6.76 | HPV56 | 4 | 8.70 | HPV18 | 1 | 6.25 | HPV56 | 28 | 6.97 |
| HPV66 | 22 | 6.47 | HPV33 | 4 | 8.70 | HPV56 | 1 | 6.25 | HPV33 | 28 | 6.97 |
| HPV33 | 21 | 6.18 | HPV51 | 4 | 8.70 | HPV66 | 1 | 6.25 | HPV66 | 25 | 6.22 |
| HPV51 | 20 | 5.88 | HPV66 | 3 | 6.52 | HPV35 | 1 | 6.25 | HPV51 | 24 | 5.97 |
| HPV68 | 20 | 5.88 | HPV18 | 2 | 4.35 | HPV52 | 0 | 0.00 | HPV31 | 22 | 5.47 |
| HPV18 | 15 | 4.41 | HPV68 | 1 | 2.17 | HPV53 | 0 | 0.00 | HPV68 | 21 | 5.22 |
| HPV31 | 15 | 4.41 | HPV39 | 1 | 2.17 | HPV51 | 0 | 0.00 | HPV18 | 18 | 4.48 |
| HPV39 | 14 | 4.12 | HPV35 | 1 | 2.17 | HPV68 | 0 | 0.00 | HPV39 | 15 | 3.73 |
| HPV59 | 14 | 4.12 | HPV53 | 0 | 0.00 | HPV39 | 0 | 0.00 | HPV59 | 14 | 3.48 |
| HPV35 | 11 | 3.24 | HPV59 | 0 | 0.00 | HPV59 | 0 | 0.00 | HPV35 | 13 | 3.23 |
| HPV45 | 2 | 0.59 | HPV45 | 0 | 0.00 | HPV45 | 0 | 0.00 | HPV45 | 2 | 0.50 |
Abbreviations: ASC-US, atypical squamous cells of undetermined significance; CIN, cervical intraepithelial neoplasia; HR-HPV, high-risk human papillomavirus.
Interestingly, the prevalence of specific HR-HPV genotypes in HR-HPV-positive cervical lesions in Jiexiu County showed some difference from those seen in Yangqu county (Table 3B). The six most common HR-HPV genotypes in women with ASC-US Pap test, in decreasing order, were HPV16 (46.09%), HPV58 (17.70%), HPV51 (9.47%), HPV52 (8.64%), HPV33 (7.41%) and HPV31 (6.58%). HPV16 was still the most common genotypes in different histologic types. HPV58 and HPV33 were tied for the second-most prevalent genotypes in CIN2+ lesions.
Table 3B.
Prevalence of HR-HPV genotypes in HR-HPV-positive cervical lesions in Jiexiu County
| HR-HPV genotypes |
<CIN2 (n=173) | HR-HPV genotypes |
CIN2 (n=47) | HR-HPV genotypes |
CIN3+ (n=23) | HR-HPV genotypes |
Total (n=243) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No | % | No | % | No | % | No | % | ||||
| HPV16 | 69 | 39.88 | HPV16 | 24 | 51.06 | HPV16 | 19 | 82.61 | HPV16 | 112 | 46.09 |
| HPV58 | 33 | 19.08 | HPV58 | 8 | 17.02 | HPV58 | 2 | 8.70 | HPV58 | 43 | 17.70 |
| HPV51 | 19 | 10.98 | HPV33 | 8 | 17.02 | HPV31 | 2 | 8.70 | HPV51 | 23 | 9.47 |
| HPV52 | 17 | 9.83 | HPV31 | 7 | 14.89 | HPV33 | 2 | 8.70 | HPV52 | 21 | 8.64 |
| HPV39 | 14 | 8.09 | HPV52 | 4 | 8.51 | HPV53 | 2 | 8.70 | HPV33 | 18 | 7.41 |
| HPV68 | 10 | 5.78 | HPV51 | 4 | 8.51 | HPV18 | 1 | 4.35 | HPV31 | 16 | 6.58 |
| HPV53 | 10 | 5.78 | HPV18 | 4 | 8.51 | HPV59 | 1 | 4.35 | HPV39 | 15 | 6.17 |
| HPV66 | 8 | 4.62 | HPV53 | 2 | 4.26 | HPV66 | 1 | 4.35 | HPV53 | 14 | 5.76 |
| HPV33 | 8 | 4.62 | HPV56 | 1 | 2.13 | HPV39 | 0 | 0.00 | HPV18 | 10 | 4.12 |
| HPV31 | 7 | 4.05 | HPV39 | 1 | 2.13 | HPV45 | 0 | 0.00 | HPV68 | 10 | 4.12 |
| HPV18 | 5 | 2.89 | HPV45 | 0 | 0.00 | HPV51 | 0 | 0.00 | HPV66 | 9 | 3.70 |
| HPV56 | 4 | 2.31 | HPV59 | 0 | 0.00 | HPV52 | 0 | 0.00 | HPV56 | 5 | 2.06 |
| HPV59 | 3 | 1.73 | HPV66 | 0 | 0.00 | HPV56 | 0 | 0.00 | HPV59 | 4 | 1.65 |
| HPV45 | 1 | 0.58 | HPV68 | 0 | 0.00 | HPV68 | 0 | 0.00 | HPV45 | 1 | 0.41 |
| HPV35 | 0 | 0.00 | HPV35 | 0 | 0.00 | HPV35 | 0 | 0.00 | HPV35 | 0 | 0.00 |
Abbreviations: ASC-US, atypical squamous cells of undetermined significance; CIN, cervical intraepithelial neoplasia; HR-HPV, high-risk human papillomavirus.
Table 3C presents the distribution of HR-HPV genotypes in all the tested women in this cohort. HPV 16 (39.53%), HPV 58 (17.83%), and HPV 52 (15.50%) were the three most prevalent HR-HPV genotypes, while HPV 18 was less prevalent (4.34%). The five most common HR-HPV genotypes in women with CIN3+ lesions were HPV16 (82.05%), HPV58 (12.82%), HPV33 (10.26%), HPV31 (10.26%) and HPV18 (5.13%). The rest of 10 HR-HPV genotypes were found in ~17.94% of women with CIN3+ on the immediate histologic examination. In women with CIN2 lesions, the five most common HR-HPV genotypes were HPV16, HPV58, HPV31, HPV33 and HPV52. HPV18 was the seventh-most prevalent genotype in CIN2 lesions and the fifth-most prevalent genotype in CIN3+ lesions.
Table 3C.
Prevalence of HR-HPV genotypes in HR-HPV-positive cervical lesions in the total study population
| HR-HPV genotypes |
<CIN2 (n=513) | HR-HPV genotypes |
CIN2 (n=93) | HR-HPV genotypes |
CIN3+ (n=39) | HR-HPV genotypes |
Total (n=645) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No | % | No | % | No | % | No | % | ||||
| HPV16 | 174 | 33.92 | HPV16 | 49 | 52.69 | HPV16 | 32 | 82.05 | HPV16 | 255 | 39.53 |
| HPV58 | 94 | 18.32 | HPV58 | 16 | 17.20 | HPV58 | 5 | 12.82 | HPV58 | 115 | 17.83 |
| HPV52 | 89 | 17.35 | HPV31 | 12 | 12.90 | HPV33 | 4 | 10.26 | HPV52 | 100 | 15.50 |
| HPV53 | 43 | 8.38 | HPV33 | 12 | 12.90 | HPV31 | 4 | 10.26 | HPV53 | 47 | 7.29 |
| HPV51 | 39 | 7.60 | HPV52 | 11 | 11.83 | HPV18 | 2 | 5.13 | HPV51 | 47 | 7.29 |
| HPV66 | 30 | 5.85 | HPV51 | 8 | 8.60 | HPV66 | 2 | 5.13 | HPV33 | 46 | 7.13 |
| HPV68 | 30 | 5.85 | HPV18 | 6 | 6.45 | HPV53 | 2 | 5.13 | HPV31 | 38 | 5.89 |
| HPV33 | 29 | 5.65 | HPV56 | 5 | 5.38 | HPV56 | 1 | 2.56 | HPV66 | 34 | 5.27 |
| HPV39 | 28 | 5.46 | HPV66 | 3 | 3.23 | HPV35 | 1 | 2.56 | HPV56 | 33 | 5.12 |
| HPV56 | 27 | 5.26 | HPV39 | 2 | 2.15 | HPV59 | 1 | 2.56 | HPV68 | 31 | 4.81 |
| HPV31 | 22 | 4.29 | HPV53 | 2 | 2.15 | HPV52 | 0 | 0.00 | HPV39 | 30 | 4.65 |
| HPV18 | 20 | 3.90 | HPV68 | 1 | 1.08 | HPV51 | 0 | 0.00 | HPV18 | 28 | 4.34 |
| HPV59 | 17 | 3.31 | HPV35 | 1 | 1.08 | HPV68 | 0 | 0.00 | HPV59 | 18 | 2.79 |
| HPV35 | 11 | 2.14 | HPV59 | 0 | 0.00 | HPV39 | 0 | 0.00 | HPV35 | 13 | 2.02 |
| HPV45 | 3 | 0.58 | HPV45 | 0 | 0.00 | HPV45 | 0 | 0.00 | HPV45 | 3 | 0.47 |
Abbreviations: ASC-US, atypical squamous cells of undetermined significance; CIN, cervical intraepithelial neoplasia; HR-HPV, high-risk human papillomavirus.
Triage accuracy of different HPV genotypes models for women with ASC-US cytology
Table 4 displays the sensitivity, specificity, PPV and NPV of the combination of 5 highest-risk HPV genotypes (HPV16/18/31/33/58) and 15 HR-HPV genotypes (HPV16/18/31/33/35/39/45/51/52/53/56/58/59/66/68) in detecting CIN2+ and CIN3+ lesions in women with ASC-US. The sensitivity of the 5 highest-risk HPV genotypes (HPV16/18/31/33/58) for detecting CIN2+ and CIN3+ lesions was 72.46 % and 95.00%, respectively. The specificity for detecting CIN2+ and CIN3+ lesions was 81.57% and 78.39%, respectively. The NPV for detecting CIN2+ and CIN3+ was 96.87% and 99.86%, respectively. The sensitivity and NPV of the 5 highest-risk HPV genotypes were similar to those of the 15 HR-HPV genotypes for detecting CIN2+ and CIN3+ lesions. However, compared with the 15 HR-HPV genotypes, the 5 highest-risk HPV genotypes had significantly higher specificity for detecting both CIN2+ and CIN3+ lesions. In addition, the 5 highest-risk HPV genotypes had significant higher PPV for detecting CIN2+ lesions. Moreover, the colposcopy referral rate using the 5 highest-risk HPV genotypes (23.15%, 443/1,914) was significantly lower than that using 15 HR-HPV genotypes (33.70%, 645/1,914).
Table 4.
Performance for detecting CIN2+ and CIN3+ by 5 highest-risk HPV genotypes and 15 HR-HPV genotypes for all cases
| Group | HPV assay | Sensitivity % (95% CI) | Specificity % (95% CI) | PPV % (95% CI) | NPV % (95% CI) | Referral rate (%) |
|---|---|---|---|---|---|---|
| CIN2+ | 5 highest-risk HPV genotypes | 72.46 (64.92-78.94) | 81.57 (79.65-83.34) | 27.31 (23.27-31.76) | 96.87 (95.82-97.68) | 23.15 (443/1,914) |
| 15 HR-HPV genotypes | 79.04 (71.93-84.79) | 70.64 (68.43-72.75) | 20.47 (17.46-23.83) | 97.24 (96.14-98.04) | 33.70 (645/1,914) | |
| P value | 0.160 | <0.001 | 0.009 | 0.570 | <0.001 | |
| CIN3+ | 5 highest-risk HPV genotypes | 95.00 (81.79-99.13) | 78.39 (76.44-80.22) | 8.58 (6.22-11.68) | 99.86 (99.45-99.98) | 23.15 (443/1,914) |
| 15 HR-HPV genotypes | 97.50 (85.27-99.87) | 67.66 (65.48-69.77) | 6.05 (4.39-8.25) | 99.99 (99.49-100.00) | 33.70 (645/1,914) | |
| P value | 1.000 | <0.001 | 0.110 | 1.000 | <0.001 |
Abbreviations: CI, confidence interval; CIN, cervical intraepithelial neoplasia; HPV, human papillomavirus; NPV, negative predictive value; PPV, positive predictive value.
Two-year follow-up results of women with ASC-US cytology and initial baseline normal cervix or CIN1
Of 1,747 women with normal cervix or CIN1 at baseline colposcopic examination, 1,385 patients (79.28%) including 990 HR-HPV negative and 395 HR-HPV positive women underwent both HPV genotyping test and colposcopic examination at the 2-year follow-up. Among 990 women with initial negative HPV testing, 130 cases were found to have HR-HPV positive (13.13%) and 8 cases developed CIN2 at the 2-year follow-up. Among 395 women with baseline positive HPV testing, 50 cases had new HR-HPV infection (12.66%), and 52 cases had persistent infection (13.16%). 14 (26.9%, 14/52) women with persistent HR-HPV infection developed CIN2.
Table 5 demonstrates the prevalence of HR-HPV genotypes of women who underwent 2-year follow-up testing including 180 women with new HR-HPV infection and 52 women with persistent HR-HPV infection. Among them, the most common genotypes were HPV16 (28.02%), HPV58 (20.26%) and HPV52 (17.67%). Of the 16 CIN2 cases with positive HR-HPV test, the 5 highest-risk HPV genotypes were HPV16 (68.75%), HPV58 (37.5%), HPV18 (12.5%), HPV31 (12.5%) and HPV33 (12.5%) (Table 6).
Table 5.
Prevalence of HR-HPV genotypes at 2 years of follow-up in women with initial ASC-US cytology and normal cervix and CIN1 on immediate histologic examination
| HR-HPV genotypes |
HR-HPV New infection (n=180) | HR-HPV genotypes |
HR-HPV persistence (n=52) | HR-HPV genotypes |
Total (n=232) | |||
|---|---|---|---|---|---|---|---|---|
| No | % | No | % | No | % | |||
| HPV16 | 46 | 25.56 | HPV16 | 19 | 36.54 | HPV16 | 65 | 28.02 |
| HPV58 | 34 | 18.89 | HPV58 | 13 | 25.00 | HPV58 | 47 | 20.26 |
| HPV52 | 31 | 17.22 | HPV52 | 10 | 19.23 | HPV52 | 41 | 17.67 |
| HPV39 | 19 | 10.56 | HPV53 | 5 | 9.62 | HPV53 | 22 | 9.48 |
| HPV51 | 18 | 10.00 | HPV33 | 4 | 7.69 | HPV39 | 20 | 8.62 |
| HPV53 | 17 | 9.44 | HPV18 | 3 | 5.77 | HPV51 | 20 | 8.62 |
| HPV33 | 14 | 7.78 | HPV31 | 3 | 5.77 | HPV33 | 18 | 7.76 |
| HPV31 | 12 | 6.67 | HPV51 | 2 | 3.85 | HPV31 | 15 | 6.47 |
| HPV66 | 10 | 5.56 | HPV39 | 1 | 1.92 | HPV18 | 11 | 4.74 |
| HPV68 | 10 | 5.56 | HPV68 | 1 | 1.92 | HPV68 | 11 | 4.74 |
| HPV18 | 8 | 4.44 | HPV35 | 0 | 0.00 | HPV66 | 10 | 4.31 |
| HPV56 | 5 | 2.78 | HPV45 | 0 | 0.00 | HPV56 | 5 | 2.16 |
| HPV35 | 4 | 2.22 | HPV56 | 0 | 0.00 | HPV35 | 4 | 1.72 |
| HPV59 | 3 | 1.67 | HPV59 | 0 | 0.00 | HPV59 | 3 | 1.29 |
| HPV45 | 2 | 1.11 | HPV66 | 0 | 0.00 | HPV45 | 2 | 0.86 |
Abbreviations: ASC-US, atypical squamous cells of undetermined significance; CIN, cervical intraepithelial neoplasia; HR-HPV, high-risk human papillomavirus.
Table 6.
Prevalence of HR-HPV genotypes in HR-HPV-positive cervical lesions at 2 years of follow-up in women with initial ASC-US cytology and normal cervix and on immediate histologic examination
| HR-HPV genotypes |
<CIN2 (n=216) | HR-HPV genotypes |
CIN2 (n=16) | HR-HPV genotypes |
Total (n=232) | |||
|---|---|---|---|---|---|---|---|---|
| No | % | No | % | No | % | |||
| HPV16 | 44 | 20.37 | HPV16 | 11 | 68.75 | HPV16 | 55 | 23.71 |
| HPV58 | 33 | 15.28 | HPV58 | 6 | 37.5 | HPV58 | 39 | 16.81 |
| HPV52 | 31 | 14.35 | HPV18 | 2 | 12.5 | HPV52 | 32 | 13.79 |
| HPV39 | 19 | 8.80 | HPV31 | 2 | 12.5 | HPV39 | 19 | 8.19 |
| HPV51 | 18 | 8.33 | HPV33 | 2 | 12.5 | HPV51 | 18 | 7.76 |
| HPV53 | 17 | 7.87 | HPV52 | 1 | 6.25 | HPV53 | 18 | 7.76 |
| HPV33 | 14 | 6.48 | HPV53 | 1 | 6.25 | HPV33 | 16 | 6.90 |
| HPV31 | 11 | 5.09 | HPV35 | 0 | 0 | HPV31 | 13 | 5.60 |
| HPV66 | 10 | 4.63 | HPV39 | 0 | 0 | HPV18 | 10 | 4.31 |
| HPV68 | 10 | 4.63 | HPV45 | 0 | 0 | HPV66 | 10 | 4.31 |
| HPV18 | 8 | 3.70 | HPV51 | 0 | 0 | HPV68 | 10 | 4.31 |
| HPV56 | 5 | 2.31 | HPV56 | 0 | 0 | HPV56 | 5 | 2.16 |
| HPV35 | 4 | 1.85 | HPV59 | 0 | 0 | HPV35 | 4 | 1.72 |
| HPV59 | 3 | 1.39 | HPV66 | 0 | 0 | HPV59 | 3 | 1.29 |
| HPV45 | 2 | 0.93 | HPV68 | 0 | 0 | HPV45 | 2 | 0.86 |
Abbreviations: ASC-US, atypical squamous cells of undetermined significance; CIN, cervical intraepithelial neoplasia; HR-HPV, high-risk human papillomavirus.
Discussion
Cervical cancer remains an important public health issue in China, especially in the large rural areas where the health resources are limited, and the cervical cancer screening coverage is low. In order to develop a more cost-effective and efficient cervical cancer screening program in the Chinese rural population, we initiated a large population-based cervical cancer screening program and a prospective cohort in the rural areas of Shanxi province, China in 2014. We herein report the results of HPV genotyping, immediate histologic correlation and 2-year follow-up of 2,304 women with ASC-US cytology. To the best of our knowledge, this is the largest prospective study on ASC-US women with genotyping and histological correlation in the Chinese rural population.
In this study, the detection rate of ASC-US among 40,000 women in two rural counties was 5.76% (2,304/40,000), which is within the range of 3.7-10% of ASC-US reporting rate in the Chinese population after the introduction of LBC preparation method 4, 5, 23, 24. Our results showed approximately 33.70% of women with ASC-US were HR-HPV-positive, similar to the HR-HPV positive rate of 34.98% in the study of Zheng et al, but lower than those reported (48.7% and 49%) in other two Chinese studies 4, 23, 24. Similar to the findings in the study of Guo et al, the HR-HPV prevalence among women with ASC-US in this study was associated with the severity of cervical abnormalities 24. Furthermore, we also found that HPV 16, HPV58, HPV33, HPV31 and HPV18 were the five most prevalent HR-HPV genotypes associated with CIN3+ lesions in the study population. This finding was in general agreement with the results from previous studies 24-26. In the current investigation, the risks of CIN3+ lesions for HPV45 and HPV52 were not found in our cohort. Three patients with HPV45-infection had normal cervixes on the histopathologic examination. 89% of 100 women with HPV52 infection had normal or CIN1 findings and the rest of 11% had CIN2 lesion on the immediate histopathologic examination.
According to the principle of “equal management of equal risks”, clinical management should be treated differently for ASC-US patients with different HPV genotypes. Previous studies have confirmed that HR-HPV genotyping could help identify women at highest risk for high-grade cervical lesions 27-29. Through a systemic review, Bonde et al demonstrated that the published evidence from US, United Kingdom, Sweden, Denmark, and the Netherlands support the clinical utility for HPV genotyping in risk discrimination for CIN3+ lesions during cervical cancer screening30. There is very limited experience using HR-HPV genotyping in triaging Chinese women with ASC-US. Lin et al investigated the role of genotyping of HPV 16/18 in 329 Chinese women and found that the sensitivity and specificity for HPV16/18 in detecting CIN2+ lesion in women with ASC-US were 82% and 91% 31. Guo et al investigated 393 Chinese women with ASC-US cytology and found higher sensitivity of HPV16/18/33/52/58 (93%) in detecting CIN2+ in ASC-US cases compared with HPV16/18/52 (80%), HPV16/18/52/58 (89%), and the specificity of HPV16/18/33/52/58 for detecting CIN2+ was 76% 24. In the current study, we evaluated the possibility of using a combination of five most common HPV genotyping (HPV16/18/31/33/58), which were identified in patients with CIN3+ lesions in our study cohort, to risk-stratify the women with ASC-US. Our results showed that the 5 highest-risk HPV genotypes had a slightly lower sensitivity (72.46% vs 79.04% in detecting CIN2 and 95.0% vs 97.50% in detecting CIN3+), but significantly higher specificity (81.57% vs 70.64% for detecting CIN2+, and 78.36% vs 67.66% for detecting CIN3+, p<0.001) than 15 HR-HPV genotypes in detecting CIN3+ and CIN2+ lesions in women with ASC-US. In addition, the 5 highest-risk HPV genotypes also reduced the rate of colposcopy referrals by approximately 10% (p<0.001). Our current results, after analyzing more than 2,000 ASC-US cases support the strategy that genotyping of combination of the most common HR-HPV types would provide a more efficient and cost-effective model in risk-stratifying women with ASC-US.
In this study, we also followed-up the women with ASC-US cytology who did not receive any treatment for a 2-year period of time. Our results found that the incidence and risk of progression to CIN 2 were the highest in women with persistent HR-HPV infection during the follow-up period. These findings are in line with those of previous studies indicating that persistent HR-HPV infection is the most important risk factor for the development of cervical cancer and precancerous lesions 32-35. In the present study, women infected with those 5 highest-risk HPV genotypes were the most likely population to develop CIN2. As shown in another study, the 3-year cumulative risks of developing CIN3+ lesions for women with HPV16 (16.0%), HPV18 (7.4%), HPV31 (7.0%), and HPV33/HPV58 (7.1%) were higher than the overall 5.2% risk associated with Hybrid Capture 2 (HC2) positivity 36. These results further support the approach of genotyping for the combination of 5 highest-risk HPV genotypes could provide risk stratification for women with ASC-US. As mentioned earlier, due to the limited public health resource in the rural areas in China, the development of this specific HPV genotyping assay might significantly improve the cost-effectiveness of HPV testing by reducing unnecessary colposcopy burden as well as overtreatment, which would have significant impact in the Chinese rural population.
The current study has some limitations. First, this study population had not previously been vaccinated for HPV. As a result, the prevalence of HR-HPV genotypes in HPV-Vaccinated population may be different. Second, in this study, the selection of 5 HPV genotypes (HPV16/18/31/33/58) was based on a relatively small sample size, and larger sample sizes and study in different geographic regions are needed to validate this novel HPV genotyping assay.
In conclusion, in this large-scaled prospective study with cross-sectional analysis as well as 2-year follow-up analysis, the genotyping for a combination of HPV16/18/31/33/58 provides a more efficient and cost-effective risk-stratification model in women with ASC-US in our study population. Women who tested negative for the 5 highest-risk HPV genotypes (HPV16/18/31/33/58) may not require immediate colposcopy. Further prospective studies with larger sample sizes, as well as from different geographic regions are needed to validate this novel HPV genotyping assay in the triage of women with ASC-US in the Chinese rural population.
Acknowledgments
We are grateful for the contribution of our coworkers involved in conducting the study and writing this article. We also thank all the study participants, as well as the investigators and local healthcare workers from the Jiexiu Family Planning/Women and Children Health Service Center and Yangqu County Hospital for their help with the study.
Ethical Statement
The study protocol and informed consent form were reviewed and approved by the Ethics Committee of Second Hospital of Shanxi Medical University. All women who decided to participate provided written informed consent before they enrolled in the study.
Funding
This project was supported by the Special Public Welfare Industry Research of National Health and Family Planning Commission of China (grant number: 201402010), the National Natural Science Foundation of China (grant number: 81972452, 81702583), the Key Research and Development (R&D) Projects of Shanxi Province (grant number: 201803D31121, 201903D321152).
Author Contributions
CZ and MH: project administration and writing - review & editing. WW, HZ, and LL: conceptualization, formal analysis, and writing - original draft. AY: data curation, and writing - review & editing. JY, WZ, ZW, LZ, XS, ZW, and XN: Investigation. CW, HZ, BF, DL, and HL: Methodology. JW, JS, LL, and WL: Project administration. All authors read and approved the final manuscript.
Abbreviations
- ASC-US
atypical squamous cells of undetermined significance
- CI
confidence interval
- CIN
cervical intraepithelial neoplasia
- ECC
endocervical curettage
- HR-HPV
high-risk human papillomavirus
- LBC
liquid based cytology
- NPV
negative predictive value
- PPV
positive predictive value
- SCC
squamous cell carcinoma
- TBS
The Bethesda system
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