Karolina Raczkowska-Łabuda, Anna Gorzelnik, Jolanta Jadczyszyn, *Lidia Zawadzka-Głos
HPV-related head and neck tumors – 10 years of experience with human papillomavirus vaccinations
HPV-zależne nowotwory głowy i szyi a 10 lat doświadczeń ze szczepionkami przeciwko wirusowi brodawczaka ludzkiego
Department of Pediatric Otolaryngology, Medical University of Warsaw, Poland
Head of Department: Associate Professor Lidia Zawadzka-Głos, MD, PhD
Streszczenie
W ostatnich latach obserwuje się w Europie dynamiczny wzrost zachorowań na nowotwory głowy i szyi. Co roku około 6000 osób w naszym kraju zostaje postawionych przed diagnozą patologicznego rozrostu w obrębie narządów głowy i szyi. Ryzyko zachorowania na nowotwory tej grupy zwiększa się u obu płci proporcjonalnie do wieku, ze szczytem około 64. r.ż. Prawidłowo postawiona diagnoza nowotworu głowy i szyi typowo ma miejsce w wieku między 45. a 64. r.ż.
W wielu krajach Europy, w tym i w Polsce, obserwowany jest tzw. „fenomen epidemiologiczny” czyli wzrost zapadalności na nowotwory głowy i szyi u osób poniżej 40. r.ż., które nigdy nie paliły i nie nadużywały alkoholu. Zmienił się profil pacjenta z nowotworem głowy i szyi.
Szacuje się, że ponad 90% mężczyzn i 80% kobiet będzie zainfekowanych przynajmniej jednym typem wirusa HPV w trakcie swojego życia. Połowę tych infekcji wywołają typy onkogenne. Typ 16 wirusa odpowiada za 90% infekcji wysokiego ryzyka i podnosi prawdopodobieństwo wystąpienia nowotworu jamy ustnej i gardła zależnych od wirusa brodawczaka ludzkiego nawet 15 do 230 razy. W obliczu odmienności przebiegu i rokowania u chorych ze zmianą związaną z wirusem brodawczaka ludzkiego wyłączono nowotwory głowy i szyi HPV-zależne z dotychczasowego systemu stagingu TNM (ang. tumor, nodes, metastasis) i utworzono odrębną grupę uwzględniającą jedynie zmiany tego typu.
Szczepionki przeciwko HPV to jeden z najważniejszych kroków w prewencji nowotworowej ostatnich kilku dekad. W Polsce dostępne są 3 różne preparaty ujęte jako dodatkowe w PSO.
Summary
In the recent years, there has been a rapid increase in the incidence of head and neck cancers in Europe. Every year, 6,000 persons in Poland are diagnosed with a neoplastic proliferative disease in the head and neck region. The risk of cancer of this group increases with age in both genders, with a peak incidence around the age of 64. A diagnosis of a head and neck tumor typically occurs between the age of 45 and 64.
In many European countries, including Poland, the so-called “epidemiological phenomenon” is observed. Epidemiological phenomenon consists in an increasing incidence of head and neck cancers in persons under 40 years of age who had never smoked or abused alcohol. The profile of patient with head and neck cancer has changed.
It is estimated that over 90% of men and 80% of women will be infected with at least one type of HPV in their lifetime. Half of the infections are caused by the oncogenic types. HPV type 16 is responsible for 90% of high-risk infections and increases the likelihood of human papillomavirus-related oropharyngeal cancers by 15 to 230 times, depending on the type of the virus. In the view of the differences in course and prognosis in patients with HPV-related cancers, these tumors have been excluded from the existing TNM staging system (tumor, nodes, metastasis), and a separate classification, only for this group of tumors, was created.
HPV vaccines have been one of the most important steps in cancer prevention in the last few decades. In Poland, 3 different vaccines are included in the National Vaccination Program as recommended, but they are not reimbursed by the State.
Introduction
In the recent years, there has been a rapid increase in the incidence of head and neck cancers in Europe, with Poland being no exception. Every year, approximately 6,000 persons in Poland are diagnosed with a neoplastic proliferative disease in the head and neck region, which are generally associated with unfavorable prognosis (1). The risk of cancer of this group increases with age in both genders, with a peak incidence around the age of 64. A diagnosis of a head and neck tumor typically occurs between the age of 45 and 64 (1, 2).
In many European countries, including Poland, the so-called “epidemiological phenomenon” is observed. Epidemiological phenomenon consists in an increasing incidence of head and neck cancers in persons under 40 years of age who had never smoked or abused alcohol (2, 3). In these cases, undisputable association of the disease with the infection with HPV (human papillomavirus) was detected (2, 3).
Epidemiology
According to the current data by the National Tumor Registry (pol. Krajowy Rejestr Nowotworów), head and neck tumors (i.e. diseases with IDC-10 codes C00-C15, C30-C33, C69, and C73) accounted for 9% of all malignancies diagnosed in males and 5% of all malignancies diagnosed in females in 2012 (1). Specialists treating these cancers suggest that these statistics are underestimated (4). WHO data show that 550,000 new cases of oropharyngeal cancer and 160,000 new cases of laryngeal cancers are diagnosed worldwide each year (2-6). It is estimated that approximately 400,000 persons worldwide die each year from head and neck tumors (2-6).
HPV epidemic?
In most countries of the world, the number of new cases of oral, laryngeal and hypopharyngeal cancer is decreasing, which is strongly associated with a decline in consumption of tobacco products. Unfortunately, in the past 20-30 years, the incidence of oropharyngeal malignancies (primarily of the tonsils, tongue base and velum) has been increasing. This seems to be confirmed by statistical data from Australia (7), Canada (8), Denmark (9), Norway (10), Sweden (11), Netherlands (12), United States of America (13), and United Kingdom (14). The analysis of the dissociation of the incidence of head and neck cancer in those two locations contributed to establishing a relationship between pharyngeal lesions and human papillomavirus (15). It is currently estimated that nearly 70% of cases of pharyngeal cancer is related to HPV (16, 17).
Profile of patients with an HPV-related head and neck cancer
As a result, the profile of a patient with an HPV-related head and neck tumor has changed as well. The majority of clinical data on the subject were collected in the ICON-S analysis (Collaboration on Oropharyngeal Cancer Network for Staging) (18). The study included 1,907 persons with HPV-related oral and pharyngeal tumors and 696 patients with squamous cell head and neck carcinomas that were not HPV-related. It was shown that a typical patient diagnosed with an HPV-related tumor is a young Caucasian male (with two peaks of incidence – at 30 and 55 years of age). Among the patients with HPV-related head and neck cancer, 84% of them are male, whereas in case of non-HPV related head and neck cancers, 76% of the patients are male. A typical patient with HPV-related head and neck cancers is not addicted to tobacco or alcohol (he consumes alcohol only occasionally), while a significant proportion of patients take marijuana. This observation does not change the fact that smoking increases the risk of infection with human papillomavirus (19). Patients with HPV-related tumors generally have a higher overall number of sexual partners (> 9) and oral sex partners (> 4) than HPV-negative patients (20). The most accurate data on race, ethnicity and sex of patients with HPV-related head and neck cancers concern United States of America (fig. 1) (21).
Fig. 1. Ethnical characteristics of patients with HPV-dependent head and neck cancer (21)
Types of human papillomavirus in laryngological cancers
It is estimated that more than 90% of men and 80% of women will be infected with at least one type of HPV during their lifetime (22-24). Half of these infections are caused by the oncogenic types of the virus (22-24). HPV type 16 is responsible for 90% of high-risk infections and increases the likelihood of human papillomavirus-related oral and pharyngeal cancers by 15 to 230 times, depending on the type of the virus (18, 25). Currently, no effective treatment for active HPV infection is known, and the course of infection is, in most cases, asymptomatic and self-limiting – recovery usually takes place within 1 to 2 years. Persons who are unknowingly infected transmit the pathogen to their partners. In addition, head and neck lesions, due to their location, develop asymptomatically or result in non-specific symptoms, typical for upper respiratory tract infections (sore throat, pain on swallowing, hoarseness) (2, 4). Moreover, there is no effective screening method for HPV-dependent head and neck cancers. Swabs, perfect for organs such as cervix or anus, are very difficult to obtain in the diagnosis of head and neck lesions. It would be desirable to obtain the material from deep crypts of palatine tonsils, but this procedure has a high risk of unsuitable sample acquisition and of false negative results (18).
HPV vaccination against cancer
The above reported data highlight the importance of HPV vaccination in the prevention of head and neck cancer. The preliminary report of the NHANES study (National Health and Nutrition Examination Survey) confirms this statement (26). There were 2,627 persons aged 18 to 33 included in the study. After on average 4 years elapsed from HPV vaccination (with a 4-valent vaccine, active against types 6, 11, 16, and 18), oral lavage was acquired from the participants and analyzed for human papillomavirus. Active infection with HPV type 6, 11, 16, or 18 was detected in 0.11% of the subjects who received at least one dose of the vaccine, and in 1.61% of subjects who were not vaccinated (p = 0.008). The difference between the groups corresponds to the reduction in the incidence of these types of the virus by 88.2%. At the same time, the incidence of infection with 33 other HPV types, which were not covered by the vaccine, was similar in both groups: 3.98% vs. 4.74% (p = 0.24) (26).
Quoting Associate Professor Maura L. Gillison: “The HPV vaccine is one of the most important advances in cancer prevention in the last several decades. Parents who choose to have their children vaccinated against HPV should realize that the vaccine may provide additional benefits, such as prevention of oral HPV infections linked to oral cancers” (27).
Diagnostics
Outcomes of treatment of patients with head and neck tumors in Poland are highly unsatisfactory. This is related, among others, to the advanced stage of the disease at the time of diagnosis, which, in turn, is a consequence of the lack of adequate screening methods and diagnostic algorithms (2, 3). Nearly 90% of patients present a painless lesion in the neck at the time of diagnosis (28). In some patients, it is difficult to determine the tumor’s origin due to its small size, and affected lymph nodes are often cystic in nature, which results in non-diagnostic aspirates in biopsy. There are several reasons for delayed diagnosis:
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