Human papillomavirus prevalence and type-specific distribution of high- and low-risk genotypes among Malagasy women living in urban and rural areas.

BACKGROUND

Cervical cancer (CC) is the most common cancer among sub-Saharan African women. Efficient, global reduction of CC will only be achieved by incorporation of human papillomavirus (HPV) vaccination into existing programmes. We aimed to investigate the overall and type-specific prevalences and distributions of oncogenic HPVs.

METHODS

A total of 1081 women aged 30-65 years were recruited to three sequential studies in Madagascar. Demographic and historical data were obtained from participants, and specimens were self-collected for HPV testing using real-time polymerase chain reaction. HPV-positive women underwent detailed pelvic examination, visual inspection of the cervix with acetic acid, biopsy, and endocervical curettage. Data were analysed using χ(2) and t-tests, and logistic regression.

RESULTS

The prevalence of all 19 high-risk types of HPV was 39.3%. There were no differences in the prevalences of HPV and CC between rural and urban Malagasy women. The most common high-risk HPV types were HPV-53 (6.2%) and HPV-68 (5.8%), followed by HPV-52 (5.2%), HPV-35 (4.5%), HPV-73 (3.4%), HPV-31 (3.4%), HPV-16 (3.1%), and HPV-18 (3.1%). The prevalence of cervical intraepithelial neoplasia≥grade 2 (CIN2+) was 9.4%. CIN1-CIN3 lesions were more common in women in their 30s. The median age of participants with CIN2+ was 44 years (range 37-55). Overall, 25.8% of CIN2+ cases were associated with HPV-16/18.

CONCLUSIONS

This study provides evidence to support the introduction of HPV vaccination in eastern African countries such as Madagascar. Further studies are needed to screen younger women and adolescents, to provide a global vision of HPV genotype distributions and to maximize the impact of HPV vaccination.