Rare cancers of unknown etiology: lessons learned from a European multi-center case-control study.

Rare cancers together constitute one fourth of cancers. As some rare cancers are caused by occupational exposures, a systematic search for further associations might contribute to future prevention. We undertook a European, multi-center case-control study of occupational risks for cancers of small intestine, bone sarcoma, uveal melanoma, mycosis fungoides, thymus, male biliary tract and breast.

BRCA1 gene-related hereditary susceptibility to breast and ovarian cancer in Latvia.

Purpose: In this report, we summarise data on BRCA1 gene analysis in Latvia to characterise criteria of genetic testing for breast and ovarian cancer susceptibility.

Material/methods: Analysis by SSCP/HD, MALDI-TOF mass spectrometry or DNA sequencing was used for mutation detection. Mutations identified were confirmed by direct DNA sequencing.

Site-specific cancer risk in the Baltic cohort of Chernobyl cleanup workers, 1986-2007.

Objective: To assess site-specific cancer risk in the Baltic cohort of Chernobyl cleanup workers, 1986-2007.

Methods: The Baltic cohort includes 17,040 men from Estonia, Latvia and Lithuania who participated in the environmental cleanup after the accident at the Chernobyl Nuclear Power Station in 1986-1991 and who were followed up for cancer incidence until the end of 2007. Cancer cases diagnosed in the cohort and in the male population of each country were identified from the respective national cancer registers.

Risk of thyroid cancer among chernobyl liquidators.

After the Chernobyl accident in 1986, the "liquidators" or clean-up workers were among those who received the highest radiation doses to the thyroid from external radiation. Some were also exposed to radioiodines through inhalation or ingestion. A collaborative case-control study nested within cohorts of Belarusian, Russian and Baltic liquidators was conducted to evaluate the radiation-induced risk of thyroid cancer.

Occupational exposure to endocrine-disrupting chemicals and the risk of uveal melanoma.

Objectives: We investigated the association between occupational exposure to endocrine-disrupting chemicals (EDC) and the risk of uveal melanoma using international data of a case-control study from nine European countries.

Methods: After exclusion of proxy interviews, 280 cases and 3084 control subjects were included in the final analysis. Information on possible exposure to EDC was derived from 27 job-specific questionnaires (JSQ), which solicited detailed questions on occupational tasks.

Pesticide exposure in farming and forestry and the risk of uveal melanoma.

Purpose: Since pesticides are disputed risk factors for uveal melanoma, we studied the association between occupational pesticide exposure and uveal melanoma risk in a case-control study from nine European countries.

Methods: Incident cases of uveal melanoma and population as well as hospital controls were included and frequency-matched by country, 5-year age groups and sex. Self-reported exposure was quantified with respect to duration of exposure and pesticide application method.

Sperm-associated antigens as targets for cancer immunotherapy: expression pattern and humoral immune response in cancer patients.

The identification of novel cancer-related and immunogenic proteins is still a challenge to be faced to improve antigen-specific tumor immunotherapy. The category of so-called cancer-testis (CT) antigens is one of the most perspective groups of proteins for anticancer immune response activation as normally they are expressed in immunoprivileged tissues and are immunogenic if aberrantly generated in tumors. The heterogeneous group of proteins called sperm-associated antigens (SPAG) might encompass novel CT antigens owing to their common expression in male germ cells, their ability to elicit immune response underlying infertility, and lately proposed oncogenic properties.

Trends in cervical cancer incidence and mortality in Bulgaria, Estonia, Latvia, Lithuania and Romania.

Objective: The burden of cervical cancer varies considerably in the European Union. In this paper, we describe trends in incidence of and mortality from this cancer in the five most affected member states.

Methods: Data on number of deaths from uterine cancers and the size of the female population of Estonia, Latvia, Lithuania, Bulgaria and Romania were extracted from the WHO mortality database.

Occupational exposure to electromagnetic fields and sex-differential risk of uveal melanoma.

Objectives: The association between occupational exposure to electromagnetic fields (EMF) and the risk of uveal melanoma was investigated in a case-control study in nine European countries.

Methods: Incident cases of uveal melanoma and population as well as hospital controls were included and frequency matched by country, 5-year birth cohort and sex. Subjects were asked whether they had worked close to high-voltage electrical transmission installations, computer screens and various electrical machines, or in complex electrical environments.

Trends in cervical cancer incidence and mortality in the Baltic countries, Bulgaria and Romania.

The burden of cervical cancer varies considerably in the European Union (EU). In this article, we describe trends in incidence of and mortality from this cancer in the two most affected areas: the Baltic countries (Estonia, Latvia and Lithuania) and Southeast Europe (Bulgaria and Romania). Incidence data were obtained from the national cancer registries.

Hormonal exposures and the risk of uveal melanoma.

Objectives: Several studies suggest that hormonal mechanisms may be associated with the development of uveal melanoma. Therefore, the association between the risk of uveal melanoma and exposure to hormonal exposures was investigated in a case-control study from nine European countries.

Methods: Incident cases of uveal melanoma were frequency-matched to population and hospital controls by country, age, and sex.

Molecular characterisation and expression analysis of SEREX-defined antigen NUCB2 in gastric epithelium, gastritis and gastric cancer.

NUCB2 is an EF-hand Ca2+ binding protein that has been implicated in various physiological processes like calcium homeostasis, hypothalamic regulation of feeding and TNF receptor shedding. In our previous study we identified NUCB2 as a potential tumour antigen eliciting autoantibody responses in 5.4% of gastric cancer patients but not in the healthy individuals.

Molecular characterisation and expression analysis of SEREX-defined antigen NUCB2 in gastric epithelium, gastritis and gastric cancer.

NUCB2 is an EF-hand Ca binding protein that has been implicated in various physiological processes like calcium homeostasis, hypothalamic regulation of feeding and TNF receptor shedding. In our previous study we identified NUCB2 as a potential tumour antigen eliciting autoantibody responses in 5.4% of gastric cancer patients but not in the healthy individuals.

Surgical treatment of gastric cancer in Latvia: results of centralized experience.

Background: Although the mortality for gastric cancer is decreasing in Western Europe and United States, it still remains high in Eastern Europe. This study was aimed at evaluating short- and long-term results of surgical treatment of gastric cancer performed in Latvia Oncology Center.

Methods: Retrospectively collected data from 461 patients who underwent gastrectomy with curative intent in Latvia Oncology Center from January 2001 to December 2005 were analyzed statistically.

Cancer risk among Chernobyl cleanup workers in Estonia and Latvia, 1986-1998.

Two cohorts of Chernobyl cleanup workers from Estonia (4,786 men) and Latvia (5,546 men) were followed from 1986 to 1998 to investigate cancer incidence among persons exposed to ionizing radiation from the Chernobyl accident. Each cohort was identified from various independent sources and followed using nationwide population and mortality registries. Cancers were ascertained by linkage with nationwide cancer registries.

Occupational risks for uveal melanoma results from a case-control study in nine European countries.

Objective: Uveal melanoma is a rare disease with poor prognosis and largely unknown etiology. We studied potential occupational risk factors.

Methods: A population based case-control study was undertaken during 1995-1997 in nine European countries using population and colon cancer controls with personal interviews.

High prevalence of two BRCA1 mutations, 4154delA and 5382insC, in Latvia.

Our aim was to characterise the germline BRCA1 mutation profile in Latvian breast cancer and ovarian cancer patients, to develop an effective BRCA1 gene mutation detection strategy, and to document genotype-phenotype correlations in mutation carriers. The entire BRCA1 gene was analysed in 75 breast cancer and 30 ovarian cancer patients. Screening for three mutations (5382insC, 4154delA and 300T>G) was carried out in 55 breast cancer and 66 ovarian cancer patients, and for two mutations, 5382insC and 4154delA, in 376 unselected patients with any cancer (including 51 breast cancer and 29 ovarian cancers) and 215 women with any gynaecological tumour.

European multi-centre case-control study on risk factors for rare cancers of unknown aetiology.

To search for occupational risk factors, we conducted a case-control study in nine European countries of cancers of the small intestine, male gall bladder, thymus, bone, male breast, melanoma of the eye, and mycosis fungoides. Recruitment was population based in Denmark, Latvia, France, Germany, Italy, and Sweden, from hospital areas in Spain and Portugal, and from one United Kingdom (UK) hospital. We recruited 1457 cases (84% interviewed).

Testicular cancer incidence in eight northern European countries: secular and recent trends.

Objective: Striking geographic variation and marked increasing secular trends characterize the incidence of testicular cancer. However, it is not known whether these patterns have attenuated in recent years and whether they are similar for seminomas and nonseminomas, the two main histologic groups of testicular cancer.

Method: Cancer registry data, including 27,030 testicular cancer cases, were obtained from Denmark, Estonia, Finland, Latvia, Lithuania, Norway, Poland, and Sweden.

Breast cancer mortality patterns and time trends in 10 new EU member states: mortality declining in young women, but still increasing in the elderly.

Breast cancer is the cancer diagnosed most frequently in women worldwide. In Europe it is the most common cancer in the female population, with approximately 350,000 new cases diagnosed each year including 130,000 deaths. Incidence rates are increasing in the majority of European countries, whereas a decline in mortality rates has been observed in many West European countries since the late 1980s and early 1990s.

Lung cancer mortality patterns in selected Central, Eastern and Southern European countries.

Significant changes in the prevalence of tobacco smoking have been observed in many European countries. EU candidate countries have also experienced major changes with respect to tobacco smoking, which have resulted in changes in the frequency of lung cancer. In men in the majority of these countries, a reduction of mortality rates has been observed recently, while in Hungary and Poland a deceleration of mortality increase was observed in the 1990s.

Randomized trial with fruits and vegetables in prevention of cancer.

Along with tobacco use, diet has the greatest impact on the development of human cancer. Within the broad category 'diet', the consumption of fruits and vegetables apparently plays a dominant role. Considerable efforts have been made to prove the preventive effect of different kinds of fruits and vegetables but randomized chemoprevention trials have failed to prove this presumed effectiveness of their single ingredients.

Altered splicing pattern of TACC1 mRNA in gastric cancer.

Transforming acidic coiled-coil (TACC) proteins are centrosome and microtubule-associated proteins that are essential for mitotic spindle function. We identified TACC1 as an immunogenic protein and a potential tumor antigen by applying serological identification of antigens by recombinant expression cloning (SEREX) technique to screen a gastric cancer cDNA library. The 5'RLM-RACE and reverse transcriptase polymerase chain reaction analyses revealed at least six different transcript variants of TACC1 with variable transcription start sites and alternative exon usage (designated TACC1-A-TACC1-F).

Studies of cancer risk among Chernobyl liquidators: materials and methods.

The current paper presents the methods and design of two case-control studies among Chernobyl liquidators-one of leukaemia and non-Hodgkin lymphoma, the other of thyroid cancer risk-carried out in Belarus, Estonia, Latvia, Lithuania and Russia. The specific objective of these studies is to estimate the radiation induced risk of these diseases among liquidators of the Chernobyl accident, and, in particular, to study the effect of exposure protraction and radiation type on the risk of radiation induced cancer in the low-to-medium- (0-500 mSv) radiation dose range. The study population consists of the approximately 10000 Baltic, 40000 Belarus and 51 000 Russian liquidators who worked in the 30 km zone in 1986-1987, and who were registered in the Chernobyl registry of these countries.