Lung cancer registries in Denmark, Finland, Norway and Sweden: a comparison and proposal for harmonization.

BACKGROUND: Lung cancer is the leading cause of cancer-related death in all Nordic countries which, though similar in demographics and healthcare systems, have noticeable differences in lung cancer survival. Historically, Denmark and Finland have had higher lung cancer incidences and lower survival than Norway and Sweden. All four countries have national cancer registries. Data in these registries are often compared, but their full potential as a source of learning across the Nordic countries is impeded by differences between the registries. In this paper, we describe and compare the Nordic registries on lung cancer-specific data and discuss how a more harmonized registration practice could increase their usefulness as a source for mutual learning and quality improvements. METHODS: We describe and compare the characteristics of data on lung cancer cases from registries in Denmark, Finland, Norway and Sweden. Moreover, we compare the results from the latest annual reports and specify how data may be acquired from the registries for research. RESULTS: Denmark has a separate clinical lung cancer registry with more detailed data than the other Nordic countries. Finland and Norway report lung cancer survival as relative survival, whereas Denmark and Sweden report overall survival. The Danish Lung Cancer Registry and the Swedish Cancer Registry do not receive data from the Cause of Death registries in contrast to the Finnish Cancer Registry and the Cancer Registry of Norway. CONCLUSION: The lung cancer registries in Denmark, Finland, Norway and Sweden have high level of completeness. However, several important differences between the registries may bias comparative analyses.

Probability of live birth after IVF/ICSI treatments in female early onset cancer survivors: a Finnish population-based registry study.

STUDY QUESTION: Does the probability of a live birth after fresh IVF/ICSI cycles with autologous oocytes differ in early onset female cancer survivors compared to their siblings? SUMMARY ANSWER: The probability of a live birth was similar in female cancer survivors and siblings after four fresh IVF/ICSI cycles. WHAT IS KNOWN ALREADY: Fertility preservation strategies are rapidly being developed to help female cancer patients who wish to have children later. However, there are only a few studies available on fertility treatments and following live births in female cancer survivors before fertility preservation strategies became available. In one of them, the probability of a live birth was reduced after assisted reproductive technology with autologous oocytes in cancer survivors compared to siblings. STUDY DESIGN, SIZE, DURATION: In this retrospective, register-based study, data from Finnish registers on cancer, birth and prescribed medications were merged to identify 8944 female cancer survivors (diagnosed with cancer between 1953 and 2012 at the age of 0-40 years) and 9848 female siblings of survivors eligible for IVF/ICSI treatments between January 1993 and December 2012. PARTICIPANTS/MATERIALS, SETTING, METHODS: Fresh IVF/ICSI cycles and following live birth rates (LBRs) within 22-48 weeks in cancer survivors and siblings at the age of 20-41 years were identified. A binomial regression model with log-link function was used to calculate risk ratio (RR) for live births after fresh IVF/ICSI cycles in survivors compared to siblings, adjusting for attained age and calendar time. A Poisson regression model was used to estimate incidence rate ratios (IRRs) for an IVF/ICSI treatment, as well as overall live births, including both pregnancies after fertility treatments and spontaneous pregnancies, in survivors compared to siblings. MAIN RESULTS AND THE ROLE OF CHANCE: We observed an overall decreased LBR, irrespective of IVF/ICSI treatments, in cancer survivors compared to siblings (IRR 0.68, 95% CI 0.64-0.71). All in all, 179 (2.0%) survivors and 230 (2.3%) siblings were prescribed fertility drugs for IVF/ICSI treatments (IRR 0.72, 95% CI 0.62-0.84). For the first fresh IVF/ICSI cycle, the LBR was 17.2% among survivors and 15.7% among siblings (RR 1.13, 95% CI 0.72-1.87). The mean LBR after four fresh IVF/ICSI cycles was not statistically different in survivors compared to siblings. LIMITATIONS, REASONS FOR CAUTION: In this study, only IVF/ICSI treatments with autologous oocytes were included. The probability of a live birth after a frozen embryo transfer or oocyte donation could not be evaluated in this study. Information on miscarriages, extrauterine pregnancies or termination of pregnancies was not available. WIDER IMPLICATIONS OF THE FINDINGS: For those early onset cancer survivors, who received IVF/ICSI treatments, the probability of live birth was not different from siblings who received IVF/ICSI treatments. However, an overall decreased LBR, irrespective of IVF/ICSI treatments, was observed in cancer survivors compared to siblings, indicating that cancer survivors receiving IVF/ICSI treatments in our study consisted of a selected group with at least a moderate ovarian reserve. STUDY FUNDING/COMPETING INTEREST(S): This study was supported by a grant from the Cancer Foundation (Finland) (grant number 130079) and by a grant from LähiTapiola. The authors have no potential conflicts of interest. TRIAL REGISTRATION NUMBER: N/A.

Sex differences in faecal occult blood test screening for colorectal cancer.

BACKGROUND: This analysis of patients in a randomized population-based health services study was done to determine the effects of faecal occult blood test (FOBT) screening of colorectal cancer (CRC) in outcomes beyond mortality, and to obtain explanations for potential sex differences in screening effectiveness. METHODS: In the Finnish FOBT screening programme (2004-2011), people aged 60-69 years were randomized into the screening and control arms. Differences in incidence, symptoms, tumour location, TNM categories, non-vital outcomes and survival in the screening and control arms were analysed. RESULTS: From 321 311 individuals randomized, 743 patients with screening-detected tumours and 617 control patients with CRC were analysed. CRC was less common in women than in men (0·34 versus 0·50 per cent; risk ratio (RR) 0·82, 95 per cent c.i. 0·74 to 0·91) and women were less often asymptomatic (16·7 versus 22·0 per cent; RR 0·76, 0·61 to 0·93). Women more often had right-sided tumours (32·0 versus 21·3 per cent; RR 1·51, 1·26 to 1·80). Among men with left-sided tumours, those in the screening arm had lower N (RR 1·23, 1·02 to 1·48) and M (RR 1·57, 1·14 to 2·17) categories, as well as a higher overall survival rate than those in the control arm. Furthermore among men with left-sided tumours, non-radical resections (26·2 versus 15·7 per cent; RR 1·67, 1·22 to 2·30) and postoperative chemotherapy sessions (61·6 versus 48·2 per cent; RR 1·28, 1·10 to 1·48) were more frequent in the control arm. Similar benefits of screening were not detected in men with right-sided tumours or in women. CONCLUSION: Biennial FOBT screening seems to be effective in terms of improving several different outcomes in men, but not in women. Differences in incidence, symptoms and tumour location may explain the differences in screening efficacy between sexes.

Determinants of non-participation in a mass screening program for colorectal cancer in Finland.

BACKGROUND: For an effective colorectal cancer (CRC) screening program, high participation rate is essential. However, non-participation in CRC screening program has increased in Finland. MATERIAL AND METHODS: The study was based on a population-based nationwide cohort of persons invited for CRC screening in 2004-2011. Information on the first round of the CRC screening participation and related background factors was obtained from the Finnish Cancer Registry, and information about health behavior factors from the Health Behavior Survey (HBS) in 1978-1999. Non-participation in CRC screening was analyzed with Poisson regression as incidence rate ratios (IRR) with 95% confidence intervals (95% CI). RESULTS: Of all persons invited for CRC screening (79 871 men and 80 891 women) 35% of men and 21% of women refused. Of those invited for screening, 2456 men (3.1%) and 2507 women (3.1%) were also invited to the HBS. Persons, who declined HBS, were also more likely to refuse CRC screening (men IRR 1.40, 95% CI 1.26-1.56, women 1.75, 1.52-2.02) compared to HBS participants. Never married persons had about a 75% higher risk for refusing than married ones. The youngest age group (60 years) was more likely to refuse screening than the older age groups (62 or >64 years). Smoking was associated with non-participation in screening (current smokers, men: IRR 1.32, 95% CI 1.05-1.67, women: 2.10, 1.61-2.73). CONCLUSIONS: Participation in CRC screening was affected by gender, age, and marital status. Persons, who refused the HBS, were also more likely to refuse CRC screening. Smoking was a risk factor for non-participation in CRC screening.

Health conditions associated with metabolic syndrome after cancer at a young age: A nationwide register-based study.

PURPOSE: Childhood cancer survivors are at risk for developing metabolic syndrome (MetS), which subsequently leads to cardiovascular morbidity and excess mortality. Our aim was to investigate the purchases of medications associated with MetS among 7551 early onset cancer patients compared to siblings. METHODS: Our nationwide Finnish population-based registry study analyzed the drug purchase of medication among early onset cancer patients diagnosed with cancer below the age of 35 years between 1994 and 2004 compared to siblings by linkage to the drug purchase registry, allowing for a maximal follow-up of 18 years. RESULTS: The hazard ratios (HRs) for purchasing antihypertensives and diabetes drugs were higher after both childhood (HR 4.6, 95%CI 3.1-7.0; HR 3.0, 95%1.5-6.1) and young adulthood (YA) cancer (HR 1.5, 95%CI 1.3-1.8; HR 1.6, 95%CI 1.1-2.2) compared to siblings. The HRs for purchasing lipid-lowering drugs were elevated both after childhood (HR 4.3,95%CI 0.9-19.5) and YA cancer (HR 1.6, 95%CI 1.04-2.5), but only reached significance in YA cancer patients. Among specific cancer diagnosis groups, highest HR values for antihypertensives were found in childhood acute lymphoblastic leukemia (ALL) (HR 6.1, 95%CI 3.7-10.3) and bone tumor (HR 4.3, 95%CI 1.9-9.4), and YA ALL (HR 4.8, 95%CI 3.1-7.0) and acute myeloid leukemia (AML) (HR 3.4, 95%CI 2.5-5.1) patients. Moreover, childhood ALL (HR 6.3, 95%CI 2.7-14.8), AML (HR 7.6, 95%CI 1.9-24.5) and central nervous system (CNS)-tumor (HR 3.5, 95%CI 1.3-9.2) and YA ALL (HR 3.7, 95%CI 1.2-9.5) patients showed the strongest likelihood of purchasing diabetes drugs compared to siblings. CONCLUSION: The purchase of medications associated with MetS was increased after early onset cancer and highly dependent on the age at cancer diagnosis and the cancer diagnosis. Prevention strategies are imperative for reducing potentially life-threatening cardiovascular complications after early onset cancer.

Age-related incidence of cervical cancer supports two aetiological components: a population-based register study.

OBJECTIVE: To assess whether age-related incidence of cervical cancer supports two aetiological components and to assess trends in these components due to risk factors and to organised screening in Finland. DESIGN: Population-based register study. SETTING: Finnish Cancer Registry. POPULATION: Cervical cancer cases and female population in Finland in 1953-2012. METHODS: Cervical cancer incidence was estimated using Poisson regression where age-specific incidence consists of two (early-age and late-age) normally distributed components. MAIN OUTCOME MEASURES: Accumulated net risks (incidences) and numbers of cancer cases attributed to each age-related component by calendar time. RESULTS: The accumulated cervical cancer incidence in 2008-2012 was only 30% of that in 1953-1962, before the screening started. The fit of the observed age-specific rates and the rates based on the two-component model was good. In 1953-62, the accumulated net risk ratio (RR; early-age versus late-age) was 0.42 (95% CI 0.29-0.61). The early-age component disappeared in 1973-77 (RR 0.00; 95% CI 0.00-0.08). Thereafter, the risk for the early-age component increased, whereas the risk for the late-age component decreased, and in 2008-2012 the RR was 0.55 (95% CI 0.24-0.89). CONCLUSIONS: In Finland, cervical cancer incidence has two age-related components which are likely to indicate differences in risk factors of each component. The trend in risk of both components followed the effects of organised screening. Furthermore, the risk related to the early-age component followed changes in risk factors, such as oncogenic HPV infections and other sexually transmitted diseases and smoking habits. TWEETABLE ABSTRACT: Cervical cancer incidence has two age-related components which are likely to have differencies in their aetiology.

Cardiovascular medication after cancer at a young age in Finland: A nationwide registry linkage study.

Despite improved survival rates, childhood and young adult (YA) cancer survivors face elevated risks for life-threatening morbidities, especially cardiovascular complications. Our nationwide Finnish registry study investigated the purchases of cardiovascular medication from 1993 to 2011 in patients diagnosed with cancer aged below 35 years (N = 8,197) between 1993 and 2004 compared to siblings (N = 29,974) via linkage to the drug purchase registry. The cumulative incidence for purchasing cardiovascular medications was higher in childhood and YA cancer patients compared to siblings with a rising trend over time. After childhood cancer, the highest hazard ratio (HR) was found for purchasing anticoagulants (HR 19.8, 95% CI 8.5-45.9). The HRs for any cardiovascular medication (HR 7.2, 95% CI 5.1-10.1) and cardiac medication (HR 4.8, 95% CI 3.3-6.9) were markedly elevated after childhood cancer as well. Regarding YA cancer patients, the respective HRs were 2.5 (95% CI 2.0-3.2) for anticoagulants, HR 1.7 (95% CI 1.5-1.9) for any cardiovascular medication and HR 1.5 (95% CI 1.3-1.7) for cardiac medication. Among cancer patients, highest HRs for cardiovascular medication were observed after childhood acute lymphoblastic leukemia (ALL) and bone tumors (HR 10.2, 95% CI 6.8-15.5 and HR 7.4, 95% CI 4.0-13.7) and YA ALL and acute myeloid leukemia (HR 5.1, 95% CI 3.5-7.1 and HR 2.8, 95% CI 1.8-4.0). Our study demonstrated increased HRs for purchasing cardiovascular medication after early-onset cancer compared to siblings reflecting elevated cardiovascular morbidity. Thus, the implementation of long-term cardiovascular disease screening is imperative to prevent, detect and adequately treat cardiovascular late effects after cancer at a young age.

Effectiveness of screening for colorectal cancer with a faecal occult-blood test, in Finland.

BACKGROUND: Screening for colorectal cancer (CRC) with guaiac-based faecal occult-blood test (FOBT) has been reported to reduce CRC mortality in randomised trials in the 1990s, but not in routine screening, so far. In Finland, a large randomised study on biennial FOB screening for CRC was gradually nested as part of the routine health services from 2004. We evaluate the effectiveness of screening as a public health policy in the largest population so far reported. METHODS: We randomly allocated (1:1) men and women aged 60-69 years to those invited for screening and those not invited (controls), between 2004 and 2012. This resulted in 180 210 subjects in the screening arm and 180 282 in the control arm. In 2012, the programme covered 43% of the target age population in Finland. RESULTS: The median follow-up time was 4.5 years (maximum 8.3 years), with a total of 1.6 million person-years. The CRC incidence rate ratio between the screening and control arm was 1.11 (95% CI 1.01 to 1.23). The mortality rate ratio from CRC between the screening and control arm was 1.04 (0.84 to 1.28), respectively. The CRC mortality risk ratio was 0.88 (0.66 to 1.16) and 1.33 (0.94 to 1.87) in males and females, respectively. CONCLUSIONS: We did not find any effect in a randomised health services study of FOBT screening on CRC mortality. The substantial effect difference between males and females is inconsistent with the evidence from randomised clinical trials and with the recommendations of several international organisations. Even if our findings are still inconclusive, they highlight the importance of randomised evaluation when new health policies are implemented. TRIAL REGISTRATION: 002_2010_august.

Cardiovascular morbidity in long-term survivors of early-onset cancer: a population-based study.

Improvements in cancer therapy have resulted in an expanding population of early-onset cancer survivors. In contrast to childhood and adolescent cancer survivors, there is still a lack of data concerning late morbidities among young adult (YA) cancer survivors. Thus, our aim was to investigate cardiac and vascular morbidity among early-onset cancer survivors with a special interest in YA cancer survivors. In a population-based setting, we explored the risk of cardiovascular disease in early-onset cancer survivors compared to healthy siblings. Patients diagnosed with cancer below 35 years of age since 1975 were identified from the Finnish Cancer Registry, and 5-year survivors were included in our study (N = 13,860). Information on cardiovascular morbidity was collected from the national hospital discharge registry. Compared to siblings, cancer survivors aged 0-19 and 20-34 at diagnosis had significantly elevated hazard ratios (HRs) for the studied outcomes: HR 13.5 (95% CI 8.9-20.4) and 3.6 (95% CI 2.8-4.6) for cardiomyopathy/cardiac insufficiency; HR 3.4 (95% CI 2.3-5.1) and 1.7 (95% CI 1.4-2.0) for atherosclerosis/brain vascular thrombosis; HR 3.3 (95% CI 1.7-6.5) and 1.8 (95% CI 1.5-2.1) for myocardial infarction/cardiac ischemia and HR 1.7 (95% CI 1.2-2.6) and 1.4 (95% CI 1.2-1.7) for cardiac arrhythmia. In both groups, depending on the outcome, the HR for adverse events was highest among lymphoma, brain tumor, leukemia and testicular malignancy survivors. Our results regarding late effects of childhood cancer survivors confirmed previous findings. Additionally, our study provides novel information concerning the YA cancer survivor population. Hence, our data may help in planning the risk-based long-term follow-up of early-onset cancer survivors.

Type- and age-specific distribution of human papillomavirus in women attending cervical cancer screening in Finland.

BACKGROUND: Large-scale data on type-specific HPV prevalences and disease burden are needed to monitor the impact of HPV vaccination and to plan for HPV-based cervical screening. METHODS: 33 043 women (aged 25-65) were screened for HPV by a Hybrid Capture 2 (HC2) in a population-based programme. HPV-positive women (n=2574) were triaged by cytology and HPV genotyped using PCR-Luminex. Type-specific prevalence of HPV infection and its correlation to findings in cytology triage and histology as well as Population Attributable Fractions for a referral to colposcopy and findings in histology were calculated. RESULTS: Among HC2-positive women, 61.5% had normal, 23.1% had ASC-US and 15.5% had LSIL or more severe (LSIL+) results in cytology. Out of HC2-positive samples, 57% contained the 13 Group 1/2A HPV types, which were targeted by the HC2, 15% contained Group 2B types, 8.5% Group 3 types and 30% were found to be negative in HPV genotyping. The proportion of samples positive for HPV by the HC2, but negative in HPV genotyping increased with age and decreased with increasing cytological abnormality. The most frequent types were HPV 16 (0.9% of screened women and 12.1% of the HC2-positive women), HPV 31 (0.7% and 8.9%, respectively) and HPV 52 (0.5% and 6.3%, respectively). The prevalence of Group 1/2A HPV types increased with increasing CIN grade and attributed 78.3% (95% CI 53.4-89.9) of the CIN 3+ lesions, while HPV 16 attributed 55.8% (40.0-67.5) of them. CONCLUSION: The type-specific prevalence of HPV were slightly lower than the average in international meta-analyses. Genotyping for HPV 16 better identified women with CIN 3+ than cytology triage at the threshold of LSIL+. The high proportion of women that were HC2-positive but HPV-negative in genotyping suggests that HPV genotyping may be useful also for validation of results in HPV screening. The large-scale HPV genotyping data were found to be directly useful for planning further preventive efforts for cervical cancer.

European guidelines for quality assurance in colorectal cancer screening and diagnosis: overview and introduction to the full supplement publication.

Population-based screening for early detection and treatment of colorectal cancer (CRC) and precursor lesions, using evidence-based methods, can be effective in populations with a significant burden of the disease provided the services are of high quality. Multidisciplinary, evidence-based guidelines for quality assurance in CRC screening and diagnosis have been developed by experts in a project co-financed by the European Union. The 450-page guidelines were published in book format by the European Commission in 2010.  They include 10 chapters and over 250 recommendations, individually graded according to the strength of the recommendation and the supporting evidence. Adoption of the recommendations can improve and maintain the quality and effectiveness of an entire screening process, including identification and invitation of the target population, diagnosis and management of the disease and appropriate surveillance in people with detected lesions. To make the principles, recommendations and standards in the guidelines known to a wider professional and scientific community and to facilitate their use in the scientific literature, the original content is presented in journal format in an open-access Supplement of Endoscopy. The editors have prepared the present overview to inform readers of the comprehensive scope and content of the guidelines.

European guidelines for quality assurance in colorectal cancer screening and diagnosis. First Edition--Organisation.

Multidisciplinary, evidence-based guidelines for quality assurance in colorectal cancer screening and diagnosis have been developed by experts in a project coordinated by the International Agency for Research on Cancer. The full guideline document covers the entire process of population-based screening. It consists of 10 chapters and over 250 recommendations, graded according to the strength of the recommendation and the supporting evidence. The 450-page guidelines and the extensive evidence base have been published by the European Commission. The chapter on organisation includes 29 graded recommendations. The content of the chapter is presented here to promote international discussion and collaboration by making the principles and standards recommended in the new EU Guidelines known to a wider professional and scientific community. Following these recommendations has the potential to enhance the control of colorectal cancer through improvement in the quality and effectiveness of the screening process, including multi-disciplinary diagnosis and management of the disease.

Effects of annual vs triennial mammography interval on breast cancer incidence and mortality in ages 40-49 in Finland.

BACKGROUND: The aim of this study was to evaluate the effects of mammography screening invitation interval on breast cancer mortality in women aged 40-49 years. METHODS: Since 1987 in Turku, Finland, women aged 40-49 years and born in even calendar years were invited for mammography screening annually and those born in odd years triennially. The female cohorts born during 1945-1955 were followed for up to 10 years for incident breast cancers and thereafter for an additional 3 years for mortality. RESULTS: Among 14,765 women free of breast cancer at age 40, there were 207 incident primary invasive breast cancers diagnosed before the age of 50. Of these, 36 women died of breast cancer. The mean follow-up time for cancer incidence was 9.8 years and for mortality 12.8 years. The incidence of breast cancer was similar in the annual and triennial invitation groups (RR: 0.98, 95% confidence interval (CI): 0.75-1.29). Further, there were no significant differences in overall mortality (RR: 1.20, 95% CI: 0.99-1.46) or in incidence-based breast cancer mortality (RR: 1.14, 95% CI: 0.59-1.27) between the annual and triennial invitation groups. CONCLUSIONS: There were no differences in the incidence of breast cancer or incidence-based breast cancer mortality between the women who were invited for screening annually or triennially.

Early detection of colorectal cancer with faecal occult blood test screening.

BACKGROUND: Faecal occult blood test (FOBT) screening has been shown to decrease the incidence and mortality from colorectal cancer. This study compared the stage profile of patients with colorectal cancer diagnosed at the first FOBT screening round with that of an unscreened control group. METHODS: Subjects aged 60-64 years were allocated randomly to biennial FOBT screening (52 998 subjects) or a control group (53 002) in a Finnish prospective public health policy in 2004-2006. FOBT was performed with a guaiac test. At the end of 2007 the screened and control populations were linked to the Finnish Cancer Registry database, and the colonoscopic findings in the screen positives were analysed. RESULTS: Early-stage colorectal cancer was observed in 52 per cent of the FOBT-positive subjects, in 42.2 per cent of the total screened population and in 38 per cent of the control population (P = 0.191 for FOBT positives, P = 0.592 for total screened population). The prevalence of adenomas and colorectal cancer was 31.5 and 8.2 per cent respectively among the 806 subjects with a positive FOBT. Some 27.3 per cent of all colorectal tumours in the screened population were interval cancers. The tumour was located in the right colon in 28.9 per cent of the screened subjects and 22 per cent of controls (P = 0.255). CONCLUSION: Biennial FOBT screening improves detection of colorectal cancer at the first screening round, but the high percentage of interval cancers is a cause for concern.

Implementation of colorectal cancer screening in Finland: experiences from the first three years of a public health programme.

BACKGROUND AND STUDY AIMS: Colorectal cancer mortality can be reduced by repeated screening, using faecal occult blood testing. This report describes the implementation of service screening in Finland and performance indicators from the first three years. METHODS: The programme is based on gradual expansion over six years of implementation. It involves individual-level randomisation into screening or control arms among a target population of men and women aged 60-69 years. The effects will be evaluated comparing incidence of and mortality from colorectal cancer in the invited arm with the controls. The screening test is a biannual guaiac-based faecal occult blood test with three test cards for consecutive samples and colonoscopies offered to those with any blood observed. RESULTS: Between September 2004 and December 2006, 52,994 test kits (to 26,247 men and 26,747 women) were sent out in 160 municipalities out of 444. Attendance to screening was 71% overall, 63% in men and 78% in women. People from the youngest age-group (born in 1946) were less compliant than those from the oldest one (born in 1940). Among the screened, 2.1% were found with blood in the stools, 3% of men and 1.5% of women. Cancers and adenomas were detected according to expectations, in 8.6 and 43.2%, respectively, among those who underwent colonoscopy. CONCLUSIONS: The implementation measured with attendance and performance of the test of colorectal cancer screening in Finland has been successful. The programme meets the criteria both for a randomised trial and for a public health programme allowing unbiased data to be collected during the implementation period.

Is the incidence of oral and pharyngeal cancer increasing in Finland? An epidemiological study of 17,383 cases in 1953-1999.

OBJECTIVE: The aim of this study was to describe the occurrence of oral and pharyngeal cancer in Finland over the last half century. MATERIALS AND METHODS: The study included all lip, oral and pharyngeal cancer cases diagnosed in Finland and reported to the nation-wide Finnish Cancer Registry between 1953 and 1999. RESULTS: The study comprised 17,383 new cancer cases: 11,666 in males and 5717 in females. Of these, 83% were squamous cell carcinomas. By the end of the study, 1999, the mean age at diagnosis had increased to 63 years for males and 67 for females. The age-adjusted incidence of oral and pharyngeal cancer decreased in males from 12.5 per 10(5) to 8.4 per 10(5) while it increased in females from 3.0 per 10(5) to 3.9 per 10(5). This was because of a decrease in lip cancer incidence in males, while the incidence of tongue, mouth and salivary gland cancers increased in both genders. The annual number of new oral cancer cases increased, however, in both genders. CONCLUSION: The incidence of lip cancer decreased in males, probably because of a decrease in smoking and in outdoor work. The incidence of intra-oral cancers increased in both genders, possibly because of increased alcohol consumption.

Epidemiological trends of colorectal cancer in the Nordic countries.

Cancer of the colorectum is the second most common cancer in the Nordic countries, after breast cancer. In this report, following Møller et al. (Eur J Cancer Prev 2002; 11 Suppl: S1-96), trends in incidence of colon and rectum cancers in the five Nordic countries are presented from 1958-1962 to 1993-1997, with future predictions for 2003-2007. The data originate from population-based cancer registries in each of the Nordic countries. Two thirds of the cases are colon cancers and one-third rectum cancers. From 1958-1962 to 1993-1997, the incidence of colon cancer has increased in all Nordic countries and the rates are predicted to increase further in Finland, Iceland, and Norway. The incidence rate of rectum cancer has increased slightly in Finland, Iceland, and Sweden, whereas the rate has decreased steadily in Denmark, originally a high-incidence country. In Norway the rates have increased substantially in both genders. Marked differences exist between individual Nordic countries in colorectal cancer incidence trends and known dietary or other life style associated factors cannot fully explain them.

Dietary and serum alpha-tocopherol, beta-carotene and retinol, and risk for colorectal cancer in male smokers.

OBJECTIVE: To study the association between dietary and serum antioxidant vitamins and carotenoids and risk for colorectal cancer in male smokers. DESIGN: A prospective cohort study within a randomised, double-blind, placebo-controlled trial testing supplementation with alpha-tocopherol (50 mg/day), beta-carotene (20 mg/day) or both in preventing cancer. SUBJECTS AND METHODS: Participants of the Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study with complete dietary data and serum samples available from baseline. These included 26,951 middle-aged male smokers among whom 184 colorectal cancer cases were diagnosed during 8 y of follow-up. Relative risks were calculated with Cox proportional hazards models adjusting for trial supplementation, age, body mass index, serum cholesterol, cigarettes smoked per day and physical activity. RESULTS: There was no significant association between dietary vitamin C or E, alpha-or gamma-tocopherol, retinol, alpha- or beta-carotene, lycopene or lutein+zeaxanthin and risk for colorectal cancer. Serum alpha-tocopherol, beta-carotene or retinol was also not associated with the risk, neither did the season when baseline blood was drawn modify the relationship between serum beta-carotene and colorectal cancer risk. CONCLUSIONS: Our data support the results from previous studies in which no association between dietary antioxidant vitamins and carotenoids and risk for colorectal cancer has been observed. Likewise, no association between baseline serum antioxidant concentrations and colorectal cancer risk was evident. SPONSORSHIP: The Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study was supported by a contract with the US National Cancer Institute (N01-CN-45165).

Physical activity in relation to cancer of the colon and rectum in a cohort of male smokers.

We examined the association between occupational and leisure physical activity and colorectal cancer in a cohort of male smokers. Among the 29,133 men aged 50-69 years in the Alpha-Tocopherol, Beta-Carotene Cancer Prevention study,152 colon and 104 rectal cancers were documented during up to 12 years of follow-up. For colon cancer, compared with sedentary workers, men in light occupational activity had a relative risk (RR) of 0.60 [95% confidence interval (CI), 0.34-1.04], whereas those in moderate/heavy activity had an RR of 0.45 (CI, 0.26-0.78; P for trend, 0.003). Subsite analysis revealed a significant association for moderate/heavy occupational activity in the distal colon (RR, 0.21; CI, 0.09-0.51) but not in the proximal colon (RR, 0.87; CI, 0.40-1.92). There was no significant association between leisure activity and colon cancer (active versus sedentary; RR, 0.82; CI, 0.59-1.13); however, the strongest inverse association was found among those most active in both work and leisure (RR, 0.33; CI, 0.16-0.71). For rectal cancer, there were risk reductions for those in light (RR, 0.71; CI, 0.36-1.37) and moderate/heavy occupational activity (RR, 0.50; CI, 0.26-0.97; P for trend, 0.04), and no association for leisure activity. These data provide evidence for a protective role of physical activity in colon and rectal cancer.