Annals of the Academy of Medicine, Singapore

Evaluating the effectiveness of cervical cancer screening and prevention in Singapore

Cervical cancer is the fourth most common cancer in women globally, with approximately 660,000 new cases and 350,000 deaths reported in 2022.1 In Singapore, it ranks as the 11th most common cancer among women and the 5th most frequent cancer among young women aged 15–44 years, with 309 new cases and 172 deaths reported in 2023.2 Worldwide, the highest incidence and mortality rates are observed in low- and middle-income countries, such as those in Africa, Melanesia and Southeast Asia, while the lowest rates are found in Western Asia, Australia-New Zealand and North America.1

Pelvic mass mimicking advanced tubo-ovarian malignancy with hepatic metastasis

Cervical screening in foreign domestic workers in Singapore

Introduction: Globally, cervical cancer is the fourth most common cancer in women, with about 85% occurring in low-middle income countries (LMIC) and an age-standardised incidence rate of more than 15 per 100,000. It is largely preventable through HPV vaccination and cervical cancer screening. In Singapore, 18% of the foreign domestic workforce hail from Indonesia, the Philippines, Myanmar, and India. However, there is no data on preinvasive cervical disease and cervical cancer in foreign domestic workers (FDWs) and the aim of this pilot programme is to determine the baseline screen positive rate of high-grade intraepithelial in this population. Methodology: A total of 322 FDWs were offered HPV screening through the Helping Our Helper (HOH) pilot programme. Data from this pilot program was analysed and reported using simple descriptive statistics. Results: Out of the 322 FDWs who registered for HPV screening, 68.6% participated. There was a 22.2% screen-positive rate; 10% of those who screened positive for high-risk HPV had histologically confirmed high-grade cervical intraepithelial neoplasia. This result is similar to other data on cervical cancer screening in Singaporeans. This pilot project screened less than 1% of the eligible FDWs in Singapore. Discussion: The findings of this pilot program suggest that there is public health value in providing cervical cancer screening to FDWs. Improving cervical cancer screening by increasing awareness and including routine cervical cancer screening as part of the employment medical examination should be studied. Keywords: Cervical cancer, CIN 2, colposcopy, HPV, HSIL, LSIL

Self-sampling HPV DNA test for cervical cancer screening in Singapore: A prospective study

Robotic surgery in morbidly obese women with endometrial cancer in Singapore

High-risk human papillomavirus genotype prevalence in Singapore cervical samples: Implications for clinical management

Human papillomavirus (HPV) causes over 95% of cervical cancers. The American Society for Colposcopy and Cervical Pathology (ASCCP) guidelines support a risk-based approach using the most informative test, which may include high-risk (HR) or extended genotyping. Most laboratories perform partial genotyping. This study reports findings from the comprehensive genotyping of all 14 HR HPV genotypes in cervical samples from the Singapore population. A total of 2497 cervical specimens collected in ThinPrep PreservCyt vials underwent full HPV genotyping using real-time polymerase chain reaction TOCE technology (Seegene Inc, Seoul, South Korea). Among these, 327 (13.1%) tested positive for HPV. Cytology results were available for 275 (84.1%) of these HPV-positive cases. The authors examined genotype prevalence and cytology correlations, and compared follow-up management under the Society for Colposcopy & Cervical Pathology of Singapore (SCCPS) guidelines versus ASCCP 2019 guidelines. HPV52 and 58 were the most prevalent genotypes, accounting for 32.2% of all detected HPV genotypes. Co-infections were seen in 20.2% of samples. Among 31 (9.5%) HPV16/18 cases, most had normal cytology, though some showed atypical or low-grade changes. Under the ASCCP guidelines for primary screening, 16.8% of cases could defer to repeat HPV testing in 1 year instead of immediate cytology triage under SCCPS. In co-testing, ASCCP-guided management reduced colposcopy referrals by 7.4% since these cases would only require repeat HPV testing in 1 year. Comprehensive HPV genotyping enhances risk stratification and enables more efficient patient management. Compared to SCCPS, the ASCCP guidelines reduce unnecessary procedures while preserving safety, supporting broader adoption of full genotyping and risk-based triage in cervical screening programmes in Singapore.

Improving the effectiveness of cervical cancer screening: Managing positive high-risk human papillomavirus results

Introduction: Good compliance of the management of abnormal results is important for effective cervical screening. This study investigated the rate of surveillance and follow-up outcomes for human papillomavirus (HPV)-positive women in cervical screening. Method: Women on surveillance by repeat HPV testing were identified in a prospectively managed database. Data retrieved included women’s age, country residence status, history of colposcopy, HPV-DNA status on the first and repeat tests, dates of follow-up during the 5 years since the initial screening, and histological diagnosis of cervical lesions. The main outcome measures were compliance rate for repeat HPV testing, regression and persistence rates of HPV subtypes, and detection rate of high-grade lesions (CIN2+). Results: This analysis included 680 residents in the community, mean age 44.8 (95% confidence interval 20.1–69.5) years. The compliance rate of repeat testing was 28.2% at 12 months and, cumulatively, 42.8% for the entire 5-year follow-up period. The rates were unaffected by age (P=0.5829) nor prior colposcopy (P=0.1607). There were 5 (1.7%) cases of CIN2+ detected. Of 391 women on longitudinal follow-up, 194 (60.8%) cleared their HPV infection. Some women with multiple HPV infection cleared 1 but not the other subtype(s). Thus, the regression rate was 90.3% for HPV-16, 87.0% for HPV-18 and 65.2% for HPV-12-others (P=0.0001). The annualised HPV regression rates were similar for HPV subtypes and for each follow-up year. Conclusion: Surveillance of HPV positivity is clinically important for detecting high-grade lesions. Despite a high regression rate of HPV, surveillance hesitancy is a serious weakness in routine cervical screening.

Clinical efficacy of primary human papillomavirus (HPV) screening with partial genotyping for HPV-16 and HPV-18 subtypes in women from 25 years old

Introduction: Cervical screening programmes differ in the age of women recommended for primary human papillomavirus (HPV) testing. This study aims to determine the clinical efficacy and impact of 14-high-risk HPV DNA testing for women from 25 years old. Method: This was a retrospective analysis of data collected prospectively from women 25 years or older who attended hospital-based gynaecology clinics for cervical screening. Women with history of cervical neoplasia or abnormal cytology were excluded. High-risk HPV DNA testing with partial genotyping for HPV-16 and HPV-18 were performed on cobas 4800 System (Roche Diagnostics International AG, Rotkreuz, Switzerland). Women tested positive for the 12 other high-risk HPV subtypes (HPV-12 other) had a reflex cytology test. Positive screening included positive for HPV-16 and/or HPV-18, HPV-12 other with cytology abnormalities equal to or greater than atypical squamous cells of undetermined significance, and repeated positive HPV at 12 months. HPV detection and colposcopy referral rates, and detection of high-grade neoplasia were determined. Results: Of 10,967 women studied, 822 (7.50%) were HPV DNA positive. The overall discharge rate to routine screening according to screening protocol was 93.1%. Colposcopy referral rate was 4.4%. The screening detected 41 cervical intraepithelial neoplasia grade 2+ (CIN2+) (0.37%) and 31 (0.28%) CIN3+. The number of colposcopies needed per case of CIN2+ was 9.5, similar for women below and above 30 years old. The number of colposcopies needed per case of CIN3+ for HPV-16 positivity was 8.5, compared to 17.0 for other categories (P=0.040). Colposcopy efficacy was similar for HPV-18 and HPV-12 other positivity with abnormal cytology. Conclusion: Taking CIN2+ detection and colposcopy referral rate as endpoints, HPV testing in Singapore can be extended to include women from 25 years old. Keywords: Cervical cancer screening, cervical intraepithelial neoplasia, colposcopy, obstetrics and gynaecology, Pap smear

Diagnostic accuracy of multiparametric MRI in endometrial cancer and its adjunctive value in identifying high-risk women requiring surgical staging