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- Bahmanyar, Shahram
(författare)
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Etiological aspects of gastroesophageal cancers : an epidemiological approach
- 2007
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Aims: The aims of this thesis were to study the association of overall dietary habits, duodenal ulcer and gastric ulcer diseases, as two models of Helicobacter pylori (H. pylori) infection and the development of gastroesophageal cancers to further explore the etiology of these malignancies. Moreover, the association between parity, a proxy for high level of female hormones, and stomach cancer risk was studied to shed light on the enigma of male predominance in this cancer. Methods: In a nationwide population-based case-control study in Sweden with 165 esophageal squamous cell carcinoma, 185 esophageal adenocarcinoma and 258 cardia cancer cases and 815 randomly selected controls we estimated relative risks associated with dietary patterns. Furthermore, cohorts of 61,548 and 81,379 unoperated patients with duodenal ulcer and gastric ulcer, respectively, recorded in the Swedish Inpatient Register since 1965, were followed and standardized incidence ratios were estimated for esophageal cancer by histology, compared with the Swedish general population. We also followed cohorts of 59,550 and 79,412 unoperated patients with duodenal ulcer and gastric ulcer, respectively, plus 12,840 patients with partial gastric resection and 8,105 with vagotomy, recorded since 1970. We estimated relative risks for stomach cancer by anatomical subtype compared to the Swedish general population for unoperated cohorts, whereas relative risks were estimated among operated patients relative to unoperated ones with the same ulcer type. Finally, in a case-control study, nested within a cohort of Swedish women born in 1925 or later, with 286 cardia cancer and 2,498 non-cardia stomach cancer as well as corresponding 1,430 and 12,490 controls, we investigated the relationship between parity and risk of stomach cancer by anatomic subsite. Results: A “healthy diet” tended to moderately decrease the risk of esophageal and cardia cancers, “Western diet” increased risks of cardia cancer and esophageal adenocarcinoma, whereas a dietary pattern characterized by high beer and liquor intake significantly increased the risk of squamous-cell carcinoma of the esophagus. We observed that patients with duodenal ulcer had a significant 70% excess risk of esophageal adenocarcinoma, a non- significant small excess risk of esophageal squamous cell carcinoma, a halved risk of non-cardia cancer, and a risk of cardia cancer slightly above expectation. Gastric ulcer was unrelated to esophageal adenocarcinoma but linked to 80% increased risk of esophageal squamous cell carcinoma, and doubled risks for both anatomical types of stomach cancer. Duodenal ulcer patients who underwent gastric resection had a 60% risk elevation for noncardia cancer compared to unoperated ones. Vagotomy was associated with a greater risk in the first 10 years, but this excess disappeared with further follow-up. Resected gastric ulcer patients had a 40% risk reduction for non-cardia cancer relative to their unoperated peers. We found no association between parity and risk of non-cardia stomach cancer comparing everparous women with nulliparous, whereas a statistically significant 30% risk reduction for postmenopausal cardia cancer was noted among everparous women relative to nulliparous. Conclusions: Overall dietary habits seem to play an important role in the carcinogenesis of esophageal and cardia cancer. The well-established strong inverse association of H. pylori seropositivity and risk of esophageal adenocarcinoma does not pertain to all infections. The duodenal ulcer related protection against stomach cancer does not seem to affect cardia cancer. It seems that the pattern of stomach colonization and/or the clinical consequences in the stomach might play a pivotal role in the long term outcome of H. pylori infection. With gastric resection, risks are shifted toward normality, regardless of underlying ulcer type. Exposure to female sex hormones is not associated with protection against stomach cancer and does not seem to explain the male predominance for such cancer. However the observed moderate inverse relationship between parity and cardia cancer might be mediated by other factors than hormonal.
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| 2. |
- Bahmanyar, Shahram, et al.
(författare)
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Maternal smoking during pregnancy, other prenatal and perinatal factors, and the risk of Legg-Calvé-Perthes disease
- 2008
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Ingår i: Pediatrics. - : American Academy of Pediatrics. - 0031-4005 .- 1098-4275. ; 122:2, s. e459-e464
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: The causes of Legg-Calvé-Perthes disease are largely unknown, but this pediatric disease seems to result from interruption of the blood supply to the proximal femur and is considered a vascular disease. Because maternal smoking during pregnancy influences fetal development and is associated with cardiovascular diseases in offspring, we hypothesized that this exposure is a risk for Legg-Calvé-Perthes disease and also investigated other markers of impaired fetal development and early-life exposures.MATERIALS AND METHODS: The Swedish Inpatient Register identified 852 individuals with a diagnosis of Legg-Calvé-Perthes disease from 1983 to 2005, individually matched by year of birth, age, sex, and region of residence with 4432 randomly selected control subjects. Linkage with the Swedish Medical Birth Register provided information on prenatal factors, including maternal smoking. Conditional logistic regression examined associations of maternal smoking during pregnancy and the other measures with the risk of Legg-Calvé-Perthes disease in offspring, adjusted for socioeconomic index and other potential confounding factors.RESULTS: Maternal smoking during pregnancy was associated with an increased Legg-Calvé-Perthes disease risk, and heavy smoking was associated with a risk increase of almost 100%. Very low birth weight and cesarean section were independently associated with approximately 240% and 36% increases in the risk of Legg-Calvé-Perthes disease, respectively.CONCLUSION: Maternal smoking during pregnancy and other factors indicated by impaired fetal development may be associated with an increased risk of Legg-Calvé-Perthes disease.
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| 3. |
- Bergquist, Annika, et al.
(författare)
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Increased risk of primary sclerosing cholangitis and ulcerative colitis in first-degree relatives of patients with primary sclerosing cholangitis
- 2008
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Ingår i: Clinical Gastroenterology and Hepatology. - New York : Elsevier. - 1542-3565 .- 1542-7714. ; 6:8, s. 939-943
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Tidskriftsartikel (refereegranskat)abstract
- Background & Aims: The importance of genetic factors for the development of primary sclerosing cholangitis (PSC) is incompletely understood. This study assessed the risk of PSC and inflammatory bowel disease (IBD) among first-degree relatives of patients with PSC, compared with the first-degree relatives of a cohort without PSC. Methods: Subjects from the national Swedish cohort of PSC patients (n = 678) were matched for date of birth, sex, and region to up to 10 subjects without a diagnosis of PSC (n = 6347). Linkage through general population registers identified first-degree relatives of subjects in both the PSC and comparison cohorts (n = 34,092). Diagnoses among first-degree relatives were identified by using the Inpatient Register. Results: The risk of cholangitis was statistically significantly increased in offspring, siblings, and parents of the PSC patient cohort, compared with relatives of the comparison cohort, with the hazard ratios and 95% confidence intervals, 11.5 (1.6–84.4), 11.1 (3.3–37.8), and 2.3 (0.9–6.1), respectively. The hazard ratios for ulcerative colitis (UC) among first-degree relatives of all PSC patients was 3.3 (2.3–4.9) and for Crohn's disease 1.4 (0.8–2.5). The risk of UC for relatives of PSC patients without IBD was also increased, 7.4 (2.9–18.9). Conclusions: First-degree relatives of patients with PSC run an increased risk of PSC, indicating the importance of genetic factors in the etiology of PSC. First-degree relatives of PSC patients without IBD are also at an increased risk of UC, which might indicate shared genetic susceptibility factors for PSC and UC.
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| 4. |
- Johannesson, Marie, et al.
(författare)
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Cancer risk among patients with cystic fibrosis and their first-degree relatives
- 2009
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Ingår i: International Journal of Cancer. - : Wiley. - 0020-7136 .- 1097-0215. ; 125:12, s. 2953-2956
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Tidskriftsartikel (refereegranskat)abstract
- Patients with cystic fibrosis (CF) are at increased risk of some cancers. Little is known about the cancer risks among carriers heterozygous for the CF mutation and it is hypothesized this may be associated with reduced cancer risk. Using Swedish general population-based registers, we identified 884 patients with CF from 1968 to 2003 and 3,033 of their first-degree relatives The subjects were followed from birth of index persons or 1958, whichever came later, until death, emigration or 2003, whichever came first. Cancer risks were compared with the general Swedish population using standardized incidence ratios (SIR) with 95% confidence intervals (CI). Patients, followed for an average of 21 years, were at a higher overall risk of cancer. Some 26 cancer diagnoses, after excluding multiple diagnoses of nonmelanoma skin cancer in one man, produced an overall SIR of 3.2 (95% CI 2.1-4.6). We found statistically significantly increased risks for kidney, thyroid, endocrine, lymphoma and nonmelanoma skin cancer. There was no modification of cancer risk among parents and siblings, with an average of 21 years of follow-up. This study did not identify a heterozygote advantage for CF gene mutations in relation to cancer risk.
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