(a) HPV 16 PsV NAb vs. HPV 16 cLIA, (b) HPV 16 PsV NAb vs. HPV 16 TIgG, (c) HPV 18 PsV NAb vs. HPV 18 cLIA and (d) selleck chemicals llc HPV 18 PsV NAb vs. HPV 18 TIgG. Abbreviations: GMT, geometric mean titre; PsV NAb, pseudovirus neutralizing antibody; cLIA, Merck competitive Luminex immunoassay; TIgG, Merck total IgG Luminex immunoassay; NT100, PsV NAb 100% neutralization endpoint; NT90, PsV NAb 90% neutralization endpoint; NTpartial, PsV NAb partial neutralization endpoint. Table 2 shows the proportions of subjects seropositive for HPV 16 and 18 for the three assays through to 36 months post-vaccine. At baseline, 0.1% of PsV NAb NT100 negative subjects were HPV 16 cLIA seropositive and none were HPV 18 cLIA seropositive,

whereas 10.8% and 27.5% respectively were baseline TIgG seropositive. At month 36, HPV 16 antibodies remained detectable in all subjects by MEK inhibitor all three assays. In contrast, beginning at 18 months post-vaccine, HPV 18 antibodies could not be detected by cLIA in a proportion of subjects, and by month 36, 13.6% overall of subjects had no detectable HPV 18 cLIA antibodies. When stratified by study group, HPV 18 cLIA seropositivity at 36 months was 85.9% for 2-dose girls (Group 1), 95.3% for 3-dose girls (Group 2) and 79.4% for 3-dose adults (Group 3) (1 vs. 2 p = 0.11; 1 vs. 3 p = 0.51; 2 vs. 3 p < 0.01). The TIgG assay detected HPV 18 antibodies in most subjects and all subjects were PsV NAb

seropositive (NTpartial endpoint) at 36 months. HPV 16 NT100 GMTs for 2-dose girls were similar to those for 3-dose girls through to 36 months (Table 3), and both 2- and 3-dose girls had HPV 16 NT100 GMTs approximately 2- to 3-fold higher than 3-dose adults at all time points. no For HPV 18, NT100 GMTs were similar for both 2- and 3-dose girls at 7 months, and both groups had higher GMTs than 3-dose adults. At 18, 24 and 36 months, HPV 18 GMTs for 2-dose girls were about 2-fold lower than those for 3-dose girls, but at 36 months, GMTs for 2-dose girls remained similar to those for 3-dose adults. Responses measured

by the cLIA and TIgG assays showed similar patterns. NT90 and NTpartial GMTs for both HPV 16 and 18 were consistently 2- to 8-fold higher respectively than the corresponding NT100 GMTs (Table 3 and Supplementary Fig. 2). Supplementary Fig. II.   HPV 16 and HPV 18 PsV NAb GMTs by study group to month 36. Box plots of month 7 to month 36 PsV NAb (NT100, NT90 and NTpartial) GMTs for HPV 16 and HPV 18 by study group. (a) HPV 16 PsV NAb NT100, (b) HPV 16 PsV NAb NT90, (c) HPV 16 PsV NAb NTpartial, (d) HPV 18 PsV NAb NT100, (e) HPV 18 PsV NAb NT90 and (f) HPV 18 PsV NAb NTpartial. Abbreviations: GMT, geometric mean titre; PsV NAb, pseudovirus neutralizing antibody; cLIA, Merck competitive Luminex immunoassay; TIgG, Merck total IgG Luminex immunoassay; NT100, PsV NAb 100% neutralization endpoint; NT90, PsV NAb 90% neutralization endpoint; NTpartial, PsV NAb partial neutralization endpoint.