IMMUNOBIOLOGICAL PROPERTIES
The effectiveness of Gardasil® vaccine is mediated by the formation of protective immunity with the development of humoral and cellular immune responses against human papillomavirus. The risk of HPV infection during life, without vaccination, in sexually active people is more than 50%, and it is constantly growing. The course of vaccination with the drug Gardasil® leads to the prevention of diseases caused by HPV.
Clinical efficacy
Based on the studies, 24,358 women and girls aged 16 to 45 years and 4055 men and boys aged 16 to 26 years confirmed the high profile of the efficacy and safety of the Gardasil® vaccine.
In girls and women aged 16 to 26, the Gardasil® vaccine effectively prevented cancer and precancerous dysplastic conditions of the cervix, vulva, vagina, and anogenital warts in 98-100% of cases. An analysis of cross protective efficacy shows that the administration of the Gardasil® vaccine reduces the risk of developing CIN (cervical intraepithelial neoplasia) 1/2/3 and adenocarcinoma in situ (AIS). caused by the most common oncogenic types of HPV that are not included in the vaccine.
Women 16 to 26 years old, vaccinated with Gardasil® vaccine and included in the protocol effectiveness (PRE) population in the main FUTURE II trial, were further observed in an additional long-term clinical trial for 8 years. During this period, no cases of CIN (of any degree) caused by HPV 6, 11, 16 and 18 types have been reported. In this study, the duration of protection was statistically confirmed by about 6 years.
In women from 24 to 45 years, the Gardasil® vaccine was effective in preventing persistent infection, CIN (any degree), or anogenital lesions caused by HPV types 6, 11, 16 and 18, in 88.7% of cases.
Women 24 to 45 years old, vaccinated with the Gardasil® vaccine and included in the protocol effectiveness (PRE) population in the main FUTURE III trial, were further observed in an additional long-term clinical trial for 6 years. During this period, there were no cases of CIN (any degree) and genital warts caused by HPV 6, 11, 16 and 18 types.
In young men and men, the Gardasil® vaccine prevented HPV infection in types 6, 11, 16 and 18, causing external genital lesions (anogenital warts and perineal, perianal intraepithelial neoplasia,intraepithelial neoplasia of the penis 1/2/3 degree) in 90.6% of cases, as well as anal intraepithelial neoplasia (AIN) of 1/2/3 degree in 77.5% of cases.
The duration of protection against anal cancer is currently unknown. Men aged 16 to 26 years who were vaccinated with Gardasil® vaccine and included in the protocol effectiveness (PRE) population in the main study (Protocol 020) were further observed in an additional long-term clinical trial. At the same time, no cases of HPV-induced disease (anogenital condylomas caused by HPV 6, 11 types, external genital lesions caused by HPV 6, 11, 16 and 18 types, and AIN of any degree caused by HPV 6, , 11, 16 and 18 types).
Immunogenicity
The full course of vaccination leads to the formation of specific antibodies to the four types of HPV (6, 11, 16 and 18) in more than 98% of the vaccinated.
The presence of immunological memory was shown during vaccination of seropositive (at the time of vaccination) persons. In addition, individuals who received an additional dose of Gardasil® vaccine five years after the completed vaccination course, a rapid and pronounced anamnestic immune response was observed in which the average geometric antibody titres exceeded the titers obtained one month after the first vaccination course.
In girls and boys from 9 to 15 years, the effectiveness of the vaccine was shown on the basis of immune bridging.
Girls and boys aged 9 to 15 years vaccinated with Gardasil® vaccine in the main study (Protocol 018) were further observed in an additional long-term clinical trial.
The Gardasil vaccine also provides protection in girls and women aged 9 to 26 years from CIN diseases (1/2/3 degree) or AIS. called HPV types 31, 33, 52 and 58 types.
Immune response to a 2-dose vaccination with Gardasil®
In a clinical study, it was demonstrated that the immune response (at the 7th month after the first dose) in girls aged 9-13 years (n = 259). who received 2 doses of the Gardasil® vaccine (according to the 0-6 month schedule) was no less than the immune response in women aged 16-26 beds (n = 310) who received 3 doses of the Gardasil vaccine (according to the 0-2-6 month schedule .). The duration of immune protection with a 2-dose vaccination with Gardasil was not established.