There are some results from Scotland already, all very positive https://academic.oup.com/jnci/article/116/6/857/7577291?logi...

> No cases of invasive cancer were recorded in women immunized at 12 or 13 years of age irrespective of the number of doses. > Women vaccinated at 14 to 22 years of age and given 3 doses of the bivalent vaccine showed a significant reduction in incidence compared with all unvaccinated women

For the second group, cases dropped from 8.4 to 3.2 per 100k.