Public awareness about prevention and early detection of oral cancer: a population-based study in Northern Germany

Epidemiology, Diagnostics, and Therapy of Oral Cancer-Update Review

Oral cavity and lip cancers are the 16th most common cancer in the world. It is widely known that a lack of public knowledge about precancerous lesions, oral cancer symptoms, and risk factors leads to diagnostic delay and therefore a lower survival rate. Risk factors, which include drinking alcohol, smoking, HPV infection, a pro-inflammatory factor-rich diet, and poor oral hygiene, must be known and avoided by the general population. Regular clinical oral examinations should be enriched in an oral cancer search protocol for the most common symptoms, which are summarized in this review. Moreover, new diagnostic methods, some of which are already available (vital tissue staining, optical imaging, oral cytology, salivary biomarkers, artificial intelligence, colposcopy, and spectroscopy), and newly researched techniques increase the likelihood of stopping the pathological process at a precancerous stage. Well-established oral cancer treatments (surgery, radiotherapy, chemotherapy, and immunotherapy) are continuously being developed using novel technologies, increasing their success rate. Additionally, new techniques are being researched. This review presents a novel glance at oral cancer-its current classification and epidemiology-and will provide new insights into the development of new diagnostic methods and therapies.

Designing Entrustable Professional Activities for Treatment Planning of Oral Cancer by Maxillofacial Surgery Residents: A Modified Delphi Study

Purpose

The aim of this study was to develop a competency framework based on entrustable professional activities (EPAs) in oral cancer management by postgraduate trainees in oral and maxillofacial surgery through expert consensus.

Materials and Methods

The study design was based on a modified Delphi technique and involved iterative online surveys with two rounds of data collection and analysis. Initial development of the questionnaire identified five EPAs based on 42 competencies along with supervision level and assessment strategies. The first Delphi round involved administration of the survey questionnaire online to maxillofacial surgeons meeting the inclusion criteria for experts. Consensus was achieved on five EPAs and 36 competencies (≥80% response rate). Six competencies were rephrased and sent again in the Round 2 questionnaire to achieve a consensus.

Results

A total of 45 experts participated in Round 1 followed by input from 27 experts in Round 2 of the Delphi panel. Following two iterative rounds of online surveys and feedback, expert consensus was achieved to develop an EPA framework in five EPA domains focused on the management of oral cancer by postgraduate trainees in maxillofacial surgery including 38 specific competencies, supervision level, and assessment strategies. High content validity of the study was established through a comprehensive literature search, and expert feedback was evidenced by an excellent response rate (93.34%, and 64.28%) and a stringent criteria of response agreement amongst experts (≥80%).

Conclusion

In conclusion, this study employed expert consensus to identify five EPAs with 38 competencies along with the required supervision level of postgraduate maxillofacial trainees for the management of oral cancer. This EPA framework provides a roadmap for training supervisors to map the learning outcomes in oral oncology for postgraduate trainees in oral and maxillofacial surgery.

Oral Cancer Awareness of Tertiary Education Students and General Public in Singapore

OBJECTIVES

Oral cancer confers high morbidity and mortality rates. Late diagnosis of oral cancer is linked to a lack of awareness of its existence and known risk factors. The purpose of this survey was to examine the knowledge and awareness of oral cancer amongst different groups in Singapore.

METHODS

A self-administered questionnaire (including questions on awareness, risk factor knowledge, and health beliefs about oral cancer) was distributed to undergraduate students from the medical and dental schools and other faculties at the National University of Singapore, as well as the general public.

RESULTS

A total of 470 responses were analysed. Both medical and dental students were almost universally aware of the disease and correctly identified recognised risk factors for oral cancers. Dental students had a significantly higher level of knowledge of chewing betel quid as a risk factor than medical students (98% vs 74%; P < .0001), although 1 in 10 dental students did not identify alcohol as a risk factor. In contrast, undergraduate students from other faculties were the least aware of oral cancer (62%). Within the general public, knowledge of the risk factors of oral cancer aside from smoking was low, with only 41% aware of viruses as a possible aetiology. However, the younger population group, aged 18 to 34 years old, in general had better knowledge of the risk factors of oral cancer compared with older participants.

CONCLUSIONS

There is a general lack of awareness about oral cancer and its associated risk factors amongst certain cohorts of the Singapore population. There exists room for further targeted education.

Oral cancer awareness campaign in Northern Germany: successful steps to raise awareness for early detection

PURPOSE

Oral cancer is an underestimated health problem, and its existence and the relevant prevention measures are not sufficiently known by the general population. The project thus aimed to develop, implement and evaluate an oral cancer campaign in Northern Germany, and to increase problem awareness on various levels: draw public attention to the tumour by media coverage increase awareness of early detection opportunities for the target group, and raise awareness of carrying out early detection measures by the professional groups involved.

METHODS

For each level, a campaign concept was developed and documented in terms of content and timing. The identified target group was elderly educationally disadvantaged male citizens ≥ 50 years. The evaluation concept for each level included pre-, post- and process evaluations.

RESULTS

The campaign was carried out from April 2012 to December 2014. The issue of awareness within the target group was significantly increased. Media coverage showed that regional media adopted the topic of oral cancer and placed it on their published agenda. Furthermore, the continuous involvement of the professional groups over the course of the campaign led to an increased awareness of oral cancer.

CONCLUSION

The development of the campaign concept with a comprehensive evaluation showed that the target group was successfully reached. The campaign was adapted to the required target group and specific conditions, and was also designed to be context sensitive. It is, therefore, recommended that the development and implementation of an oral cancer campaign on a national level be discussed.

Knowledge and awareness of oral cancer: A cross-sectional survey in Trieste, Italy

The aim of the study was to verify the knowledge on oral cancer and to assess possible differences in awareness and information basing on different demographic and subject-related factors. An anonymous survey was provided to 750 random subjects using online-based questionnaires. Statistical analysis was performed in order to evaluate the influence of demographic variables (gender, age, education) on knowledge of oral cancer and its risk factors. 68.4% of individuals knew about the existence of oral cancer, mostly from media and family/friends. Awareness was significantly influenced by gender and higher education, but not by age. Most participants recognized smoking as a risk factor, but alcohol abuse and sunlight exposure are less known, especially among less educated subjects. On the contrary, our study shows a diffusion of false information: more than 30% of the participants indicated the possible role of amalgam fillings in oral cancer onset, independently of gender, age or education. The results of our study suggest the need for oral cancer awareness campaigns, where school and healthcare professionals should be actively involved in promoting, organizing and finding methods to monitor the medium and long-term efficacy with proper methodological quality.

Gap areas in mitigation of oral cancer: A cross-sectional study evaluating awareness and knowledge of risk factors in oral cancer in a tertiary hospital

Purpose and Objectives

One of the main causes of the increasing oral cancer (OC) burden in India is a lack of awareness and a significant gap in knowledge about risk factors and symptomology of OC.

Materials and Methods

A questionnaire-based cross-sectional study was to evaluate the knowledge and awareness about OC among 500 random patients presenting for care at a tertiary hospital in western Rajasthan which serves a wide area of western, northern, and central Rajasthan.

Results

A total of 446 participants, among which 83.6% were males enrolled in the study. Much to our despair, the results showed 35.23% of the participants (P = 0.007) started their habit at age <15 years. Nearly 60.3% of the participants were well aware of the harmful temporary or permanent effects of the tobacco. Around 40.85% of the participants taking tobacco products were ignorant about their changes in the tissues (site of tobacco placement). TV and Radio (50.5%) were the main source of information of the ill effects of tobacco and form a major contribution in public awareness. More than 90% of the participants had read the warnings on the tobacco packets. No doubt participants have knowledge about the ill effects of tobacco still there was a lack in behavioral modifications for tobacco cessation, leading to nonsuccess in quitting, with actual nonunderstanding about the ill effects of tobacco and overall lack of belief in the tobacco control measures.

Conclusion

Our findings have found a gap in the awareness efforts of OC for the general population and will make public health professionals, clinicians, policymakers, and government a better judge and motivate them to strengthen existing national tobacco control efforts.

A survey of the awareness and knowledge of oral cancer among residents in Beijing

Background

The present study aimed to investigate oral cancer awareness and its related knowledge among residents in Beijing.

Methods

A questionnaire survey was conducted among Beijing residents concerning their knowledge of oral cancer, and its prevention and treatment.

Results

A total of 3055 questionnaires were completed, 45.8% by males and 54.2% by females. The ages of the respondents ranged from 15 to 93 years; 12.4% were smokers, 1.1% chewed betel nuts, and 82.5% brushed their teeth at least twice a day. Lung cancer was heard of by the most respondents, followed by gastric cancer and liver cancer; oral cancer was the least heard of. More than 60% of respondents were unaware of the risk factors and early signs of oral cancer.

Conclusions

This survey demonstrated a general lack of public awareness and knowledge about oral cancer. Specific measures should be taken to improve public awareness of oral cancer and its prevention and treatment.

Socioeconomic disparities between oral cavity cancer patients in Germany

Objective

In many countries the access to high quality medical service depends on socioeconomic factors. Therefore, these factors are associated with the treatment and prognosis of many diseases. In Germany health care is claimed to be independent from such factors due to obligatory health insurance and a well-developed medical infrastructure. Thus, socioeconomically caused health disparities should be absent. The aim of this study was to analyze the association between socioeconomic factors and the survival of oral cavity cancer in Germany.

Patients and methods

In this descriptive cohort study socioeconomic status related factors as well as demographic, tumor-specific, and comorbidity factors of 500 patients treated for oral cavity cancer were obtained in the university hospital of Dresden. Pearson correlation was used to describe associations between continuous variables. Associations between categorical variables were assessed using the chi-square test. Overall and recurrence-free survival were studied using the Kaplan-Meier method. Log-rank test was carried out to test between-group differences. Cox proportional hazard models were used to estimate the risk of death and the risk of recurrence.

Results

Significant differences in overall survival were found between the different educational levels and sex. Seventy-nine percent of the patients did not have a university degree or master craftsman/craftswoman. Less discrepancy was observed according to the marital status (49.4% married/engaged vs. 47.8% single, divorced, or widowed). In the multivariable analysis only sex, age at diagnosis, the Charlson score, the number of positive lymph nodes, and the nodal status were identified as independent predictors for overall survival whereas sex and the age at diagnosis were identified as independent predictors for recurrence-free survival.

Conclusion

Despite the equitable health system in Germany, significant associations between overall survival of oral cavity cancer and different socioeconomic factors could be found. For elimination of these disparities, health education programs should be established in socially deprived areas. Furthermore, clinicians should keep these factors in mind when determining recall periods for dental check-ups.

[Oral and pharyngeal cancer: incidence, mortality, and survival in Germany]

Hintergrund

Die Gruppe der Lippen‑, Mundhöhlen- und Pharynxkarzinome (ICD-10: C00–C14) beschreibt eine heterogene Gruppe bösartiger Tumoren, deren Inzidenz, Mortalität und Überleben sich nach Entität stark unterscheiden.

Ziel der Arbeit

Diese Arbeit gibt eine detaillierte Übersicht epidemiologischer Maßzahlen für diese Tumorentitäten unter Berücksichtigung der Heterogenität bezüglich Alter, Geschlecht, Lokalisation und Stadium.

Material und Methoden

Inzidenz- und Mortalitätsdaten für Deutschland für die Jahre 1999–2016 wurden aus der interaktiven Datenbank des Zentrums für Krebsregisterdaten (ZfKD) extrahiert. Alters- und Stadienverteilungen und altersstandardisiertes relatives 5‑Jahres-Überleben wurden auf dem gepoolten ZfKD-Datensatz (Diagnosejahre 1999–2017) berechnet.

Ergebnisse

Im Jahr 2016 lagen die Inzidenz und Mortalität für alle Entitäten insgesamt bei 17,6 bzw. 7,0 pro 100.000 Männern und 6,5 bzw. 1,8 pro 100.000 Frauen. Das relative 5‑Jahres-Überleben für 2015–2017 lag bei 53 % bzw. 63 %. Es zeigten sich deutliche Unterschiede in der Überlebensrate und in der Alters- und Stadienverteilung zwischen den Entitäten. Im zeitlichen Verlauf zeigte sich ein Anstieg des Alters bei Diagnose, insbesondere bei Männern, aber keine Veränderung in der Stadienverteilung. Trotzdem stieg das relative 5‑Jahres-Überleben zwischen 1999–2002 und 2013–2017 von 45 % (Männer) bzw. 59 % (Frauen) auf 52 % bzw. 63 %.

Diskussion

Die starke Heterogenität der untersuchten Tumoren verdeutlicht die Notwendigkeit einer nach Geschlechtern und Lokalisationen getrennten Betrachtung für eine aussagekräftige Interpretation der epidemiologischen Kennzahlen. Mit Ausbau der klinischen Krebsregistrierung werden in Zukunft zusätzliche Analysen unter Einbezug weiterer wichtiger klinischer Faktoren möglich sein.

Zusatzmaterial online

Zusätzliche Informationen sind in der Online-Version dieses Artikels (10.1007/s00103-021-03368-z) enthalten.

A Snapshot of Knowledge about Oral Cancer in Italy: A 505 Person Survey

Objectives: Patients' knowledge about oral squamous cell carcinoma (OSCC) plays an important role in primary prevention, early diagnosis, and prognosis and survival rate. The aim of this study was to assess OSCC awareness attitudes among general population in order to provide information for educational interventions. Methods: A survey delivered as a web-based questionnaire was submitted to 505 subjects (aged from 18 to 76 years) in Italy, and the answers collected were statistically analyzed. Information was collected about existence, incidence, features of lesions, risk factors of oral cancer, and self-inspection habits, together with details about professional reference figures and preventive behaviors. Results: Chi-square tests of independence with adjusted standardized residuals highlighted correlations between population features (age, gender, educational attainment, provenance, medical relationship, or previous diagnoses of oral cancer in family) and knowledge about oral cancer. Conclusions: Knowledge about OSCC among the Italian population is limited, and it might be advisable to implement nudging and sensitive customized campaigns in order to promote awareness and therefore improve the prognosis of this disease.

Oral cancer awareness campaign in Northern Germany: first positive trends in incidence and tumour stages

PURPOSE

Oral cancer is a still underestimated public health problem. In Germany, until 2007, there was no systematic approach available for the purpose of raising the awareness of the public. From 2007 to 2011, a concept was developed for such an approach, and the campaign was launched in Northern Germany in 2012, and concluded in 2014. This report aims at presenting incidence trends of oral cancer, stratified according to sex, age, and tumour stages, before the introduction of this campaign and upon completion thereof.

METHODS

The data kept by the Schleswig-Holstein Cancer Registry on incidence rates (ICD-10, C00-C14) focused on oral cancer (C00-C06) and stratified by sex, age-groups and tumour stages, from 2000 to 2006 and from 2007 to 2014.

RESULTS

From 2000 to 2014, a total of 6760 cases of oral and pharyngeal cancer (C00-C14) were registered. When data on oral cancer was taken into account, stage I cancers of women in particular, increased over time. Regarding the stages, stage IV was the most frequent and stage I the second most frequent stage for both men and women. Over time, a small shift towards detection of tumours at earlier stages was observed.

CONCLUSION

A slight trend towards a temporary increase in incidence rates, especially among women, was observed. From an epidemiological point of view, this might indicate the initial success of this campaign. The slight trend in favour of stage I tumours could be seen as an initial minor success in terms of the early detection of oral cancer.

People would rather see a physician than a dentist when experiencing a long-standing oral ulceration. A population-based study in Spain

BACKGROUND

Primary care physicians have been reported to be the first choice for patients with oral ulcerations. This study investigates the health-seeking behaviour of lay public in Galicia (North-western Spain) if experiencing a long-standing oral ulceration.

MATERIAL AND METHODS

Cross-sectional population-based survey of randomly selected respondents conducted from March 1, 2015 to 30 June 2016.

RESULTS

A total of 5,727 pedestrians entered the study (response rate: 53%), mostly in the 45-64 age group (30.2%; n=1,728), 47.7% of them (n=2,729) were males. Most participants (42.1%; n=2,411) reported to visit their dentist once a year and had secondary or compulsory education as their highest educational achievement (28.18%, n=1,614; 28%, n=1,600 respectively). When questioned what they would do if they had a wound/ulceration lasting longer than 3 weeks, most participants answered they would go to see their primary care physician (62.8%; n=3,597) and less than one quarter of the sample (23.8%; n=1,371) would seek consultation with their dentist.

CONCLUSIONS

General Galician population would seek professional consultation about a long-standing oral ulceration, relying mostly on primary care physicians. Those neglecting these lesions are elderly, less-schooled people and unaware of oral cancer.

Exploratory Research Focusing on Oral Cancer Prevention: Challenges of Dealing With Informational and Cognitive Barriers

Oral cancer is a considerable public health problem, and a low level of awareness and knowledge about this tumor and its risk factors is prevalent. To gain a profound understanding of risks groups and to identify suitable communication strategies for a prevention campaign in Northern Germany, an exploratory research was realized. In semistructured face-to-face interviews, the participants of the study (n = 28) described their individual oral cancer-related perceptions and information-seeking behaviors. A computer-assisted qualitative data analysis showed a vague but also deterring picture of cancer combined with restricted attitudes toward the topic and an inactive or even avoiding information behavior. Four underlying cognitive patterns of self-distancing were identified: (a) optimistic bias, (b) fatalism, (c) hedonism, and (d) pragmatism. The main challenge of oral cancer prevention is to deal with the target groups' informational and cognitive barriers.

Factors associated with delay in presentation among patients for oral cancer

Aim: This study aimed to determine factors that influence delay in presentation among oral cancer patients. Materials & methods: A cross-sectional study with 128 Oral cancer patients receiving treatment from the Hospital of Stomatology, at Jilin University, in China, was conducted. Results: A total of 78 patients delayed seeking treatment for more than 3 weeks after noticing symptoms of oral anomaly. Patients who were male, farmers (Odds ratio [OR] = 2.617; 95% CI: 1.90–3.64), or currently smoking (OR = 4.651; 95% CI: 1.21–9.46), were more likely to delay. Patients alerted to the problem at a physical exam had much lower risk of delay than patients who discovered the disease independently (OR = 0.029; 95% CI: 0.01–0.30). Higher coping style scores (OR = 0.747; 95% CI: 0.47–1.18) and oral cancer knowledge scores (OR = 0.886; 95% CI: 0.60–2.01) were significantly correlated with shorter delays. Conclusion: Delay in presentation may be achieved through regular oral health screening and improved public education about factors influencing delay.

Population Survey of Knowledge about Oral Cancer and Related Factors in the Capital of Iran

Knowledge about oral cancer risk factors and signs is thought to improve prevention and early diagnosis, and in turn, increases survival. In this population-based survey, knowledge about oral cancer was assessed in Iran. A total of 1800 self-administered questionnaires (collecting sociodemographic data and questions regarding oral cancer risk factors and signs) were distributed through random sampling. Final scores ranged between 0 and 15 for the risk factors and 0-11 for the signs. Scores below the median indicated a low level of knowledge, scores representing the third quartile of correct answers indicated a moderate level of knowledge, and scores representing the upper quartile indicated a high level of knowledge. Statistical tests were used for analysis of knowledge level in different sociodemographic categories. A total of 1312 participants completed the questionnaires. The average of knowledge scores for risk factors was 5.3 ± 3.0 and for signs was 4.5 ± 2.9. Overall, 75 and 56% respectively were able to identify major risk factors (smoking and alcohol); 23.5% could not define any related signs and symptoms. Dividing scores into quartiles indicated that three out of four people had "low" knowledge about risk factors and 58% had "low" knowledge about signs and symptoms. Females and highly educated people had more knowledge of oral cancer. Significant difference was found between job and level of knowledge (P = 0.001). This survey revealed that public knowledge of oral cancer was not satisfactory in Iran. Efforts should be done to inform and educate people with risk factors, initial clinical presentation, and symptoms, in order to improve prevention and promote early diagnosis.

Challenges of early detection of oral cancer: raising awareness as a first step to successful campaigning

In Germany, ∼ 13,000 people are found to have oral and pharyngeal cancer every year. Awareness and knowledge about this cancer remain insufficient, particularly amongst elderly people. A campaign for early detection was launched in Northern Germany in April 2012. The first step of the campaign was to increase awareness about oral cancer. Prior to a pre-campaign evaluation at the campaign start, March 2012 and an intermediate-campaign evaluation, November 2012, a sample representative for the population aged 50 ≥ years (target group; N = 500) was drawn for a first process evaluation. The surveys were conducted by means of telephone interviews including questions on behaviour, knowledge and sociodemographic/socioeconomic aspects and target group-oriented questions on issue, media and campaign material awareness. The process evaluation showed an increase in issue awareness from 25 to 40% (P < 0.001) and the media awareness increased by over 10% (P < 0.001). The results suggested that particularly women, the core age group (60-79 years) and the educationally disadvantaged group might benefit from the campaign. Awareness about the issue 'oral cancer' was already significantly increased 7 months after the campaign start. The highest general and media-related increase in awareness was achieved in the target group.

Baseline data of oral and pharyngeal cancer before introducing an oral cancer prevention campaign in Germany

OBJECTIVES

Oral and pharyngeal cancer is still a serious health problem with an annual incidence of about 13,000 in Germany. This study aimed at describing trends of incidence and mortality in Germany by age, sex, and sub-site as a baseline for an oral cancer prevention campaign.

METHODS

Using data from the National Association of Population-based Cancer Registries, incidence rates for oral and pharyngeal cancer (ICD-10, C00-C14) from 2003 to 2011 and mortality rates from 1990 to 2012 were analysed by age, sex, and sub-site (C00-C06, C07-C08, C09-C14). Trends were described by annual percentage changes.

RESULTS

Men are 2.5-times more likely than women to be diagnosed and 3-times more likely to die from this tumour. Incidence and mortality in women increased slightly during the last decade, while incidence and mortality in men remained stable at a high level. While a decline was observed for younger age groups, an increase was seen in the elderly. For some sub-sites a deviation from this overall pattern was observed.

CONCLUSIONS

The decrease in this tumour in younger age groups is pleasing and may be attributed to public efforts in non-smoker protection in recent years. Further efforts are needed to counteract the increasing burden of disease in older age groups and in men.

Mouth cancer awareness and beliefs among dental patients

OBJECTIVES

The aim of the present study was to assess the levels of awareness, knowledge about signs and risk factors of mouth (oral) cancer, and attitudes towards early diagnosis and treatment among dental outpatients.

MATERIAL AND METHODS

A total of 1,200 adult outpatients attending dental clinics at the University of Jordan Hospital for dental examination and treatment were randomly selected to participate in the study. An 18-item pretested close-ended questionnaire was used for the study. Descriptive statistics were generated and chi-square tests, t-tests, one-way analysis of variance (ANOVA), and Spearman's rho test were used to examine differences between groups.

RESULTS

Only 45.6% of the subjects had heard about oral cancer. Some 66.9% and 33.8%, respectively, were able to correctly identify tobacco and alcohol as risk factors. Some 24.1% had no knowledge about any signs of oral cancer. Male subjects, smokers, alcohol drinkers, older participants (>40 years), and participants with less than a university education were significantly less aware, and had much less knowledge, of the signs and risk factors of oral cancer (P<0.05).

CONCLUSION

Awareness about oral cancer among Jordanian dental outpatients is low. These dental patients, especially those in high-risk groups for mouth cancer and those of lower socio-economic status (SES), are less well informed about the signs and risk factors of oral cancer. Interventions to improve public knowledge about oral cancer and attitudes towards early diagnosis and treatment are urgently indicated.

Assessing oral cancer knowledge in Romanian undergraduate dental students

The aim of this study is to investigate the level of Romanian dental students' knowledge regarding the oral cancer risk and non-risk factors as well as oral cancer signs, symptoms, and diagnostic signs. A total of 192 first- to sixth-year undergraduate dental students (mean age 22.20 ± 2.94 years) who consented to participate in the study filled in a questionnaire enquiring about their knowledge of oral cancer. A score of the oral cancer knowledge was calculated for each participant based on their correct answers. Regarding the knowledge of oral cancer risk factors, the vast majority of the students correctly recognized tobacco (96.8 %), having a prior oral cancer lesion (85.1 %), the consumption of alcohol (77.7 %), and older age (64.2 %). Respectively, 87.7 and 54.3 % knew the tongue and the floor of mouth to be the most common oral cancer sites. Of the students, 71.3 % agreed that oral cancer examinations for those 20 years of age and older should be provided during regular periodic health examinations, 92.9 % considered that patients with suspicious oral lesions should be referred to specialists, and 84.6 % agreed that oral cancer examinations should be a routine part of a comprehensive oral examination. A significant association was found between the year of study in the dental school, age, and knowledge of the oral cancer knowledge scores. Although students' knowledge increased with academic year, there is a clear need to enhance the dental curricula in oral cancer clinical training in oral cancer prevention and examination for dental students.

Viral infection and oral habits as risk factors for oral squamous cell carcinoma in Yemen: a case-control study

OBJECTIVE

The role of qat chewing, tobacco (shammah) dipping, smoking, alcohol drinking, and oral viral infection as risk factors for oral squamous cell carcinoma (OSCC) in Yemen was assessed.

STUDY DESIGN

A total of 60 cases of OSCC and 120 age- and gender-matched controls were analyzed with respect to demographic data, history of oral habits, and the presence of human papillomavirus (HPV)-16, HPV-18, or Epstein-Barr virus (EBV) as determined by Taqman quantitative polymerase chain reaction. Logistic regression analysis was used to identify independent predictors of the disease.

RESULTS

Shammah use was the only risk factor for OSCC, with an odds ratio of 12.6 (CI, 3.3-48.2) and 39 (CI, 14-105) for the ex-users and current users, respectively. The association of shammah use alone with OSCC exceeded that of shammah use in combination with qat chewing, smoking, or both. EBV infection, smoking, and qat chewing showed no association with OSCC, while neither HPV-16 nor HPV-18 were detected in any sample.

CONCLUSIONS

Shammah use is a major risk factor for oral cancer in Yemen.

Trends in incidence, tumour sites and tumour stages of oral and pharyngeal cancer in Northern Germany

PURPOSE

Oral and pharyngeal cancer is the seventh leading tumour in Europe. In Germany, more than 10,000 new cancer cases are diagnosed each year. This population-based project evaluated the available data to develop a more detailed epidemiological profile of oral and pharyngeal cancer.

METHODS

The data on incidence and mortality rates of the population-based Cancer Registry of Schleswig-Holstein were evaluated according to tumour sites, tumour stages and residential areas by age groups and gender from 2000 to 2006 and the tumour stages from 2000 to 2007.

RESULTS

From 2000 to 2006, 3,127 new cases of oral and pharyngeal cancer (72% in men vs. 28% in women) were registered. About 50% of all cases, in men and women, were between 60 and 79 years. This detailed analysis of tumour sites and tumour stages showed interesting differences and revealed considerable variations. The highest incidence rates for both men and women were diagnosed in stage IV for older people, in women for oral cancer and men for pharyngeal cancer. The highest incidence and mortality trends were observed in urban areas.

CONCLUSIONS

Detailed population-based results described important variations with regard to tumour sites, stages and areas. These data play a central role as they provide the epidemiological profile of a tumour. This profile, together with possible targeted knowledge evaluations of the public and the health care providers involved, can be used as a prerequisite for health care activities and for the development of preventive strategies for targeted public awareness campaigns.