A1 Refereed original research article in a scientific journal
Baseline findings and safety of infrequent vs. frequent screening of human papillomavirus vaccinated women
Authors: Karolina Louvanto, Tiina Eriksson, Penelope Gray, Dan Apter, Iacopo Baussano, Anne Bly, Katja Harjula, Kaisa Heikkilä, Mari Hokkanen, Leila Huhtinen, Marja Ikonen, Heidi Karttunen, Mervi Nummela, Anna Söderlund‐Strand, Ulla Veivo, Joakim Dillner, Miriam Elfstöm, Pekka Nieminen, Matti Lehtinen
Publisher: WILEY
Publication year: 2019
Journal: International Journal of Cancer
Journal name in source: INTERNATIONAL JOURNAL OF CANCER
Journal acronym: INT J CANCER
Volume: 147
First page : 440
Last page: 447
Number of pages: 8
ISSN: 0020-7136
eISSN: 1097-0215
DOI: https://doi.org/10.1002/ijc.32802
Less frequent cervical cancer screening in human papillomavirus (HPV) vaccinated birth cohorts could produce considerable savings without increasing cervical cancer incidence and loss of life-years. We report here the baseline findings and interim results of safety and accuracy of infrequent screening among HPV16/18 vaccinated females. The entire 1992-1994 birth-cohorts (30,139 females) were invited to a community-randomized HPV16/18-vaccination trial. A total of 9,482 female trial participants received HPV16/18-vaccination in 2007-2009 at age of 13-15. At age 22, 4,273 (45%) of these females consented to attend a randomized trial on frequent (ages 22/25/28; Arm 1: 2,073 females) vs. infrequent screening (age 28; Arm 2: 2,200 females) in 2014-2017. Females (1,329), who had got HPV16/18 vaccination at age 18 comprised the safety Arm 3. Baseline prevalence and incidence of HPV16/18 and other high-risk HPV types were: 0.5% (53/1,000 follow-up years, 10(4)) and 25% (2,530/10(4)) in the frequently screened Arm 1; 0.2% (23/10(4)) and 24% (2,413/10(4)) in the infrequently screened Arm 2; and 3.1% (304/10(4)) and 23% (2,284/10(4)) in the safety Arm 3. Corresponding prevalence of HSIL/ASC-H and of any abnormal cytological findings were: 0.3 and 4.2% (Arm 1), 0.4 and 5.3% (Arm 2) and 0.3 and 4.7% (Arm 3). Equally rare HSIL/CIN3 findings in the infrequently screened safety Arm A3 (0.4%) and in the frequently screened Arm 1 (0.4%) indicate no safety concerns on infrequent screening despite the up to 10 times higher HPV16/18 baseline prevalence and incidence in the former.
