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Bayesian adjustment for over-estimation and under-estimation of gastric cancer incidence across Iranian provinces

World Journal of Gastrointestinal Oncology 2017年第2期9卷 87-93页

作者： nastaran hajizadeh Mohamad Amin Pourhoseingholi Ahmad Reza Baghestani Alireza Abadi Mohammad Reza Zali Department of Biostatistics Shahid Beheshti University of Medical Sciences Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center Research Institute for Gastroenterology and Liver Diseases Shahid Beheshti University of Medical Sciences Gastroenterology and Liver Diseases Research Center Research Institute for Gastroenterology and Liver Diseases Shahid Beheshti University of Medical Sciences

AIM To correct the misclassification in registered gastric cancer incidence across Iranian provinces in cancer registry data. METHODS Gastric cancer data is extracted from Iranian annual of national cancer registration report 2008. A Bayesian method with beta prior is implemented to estimate the rate of misclassification in registering patient'spermanent residence in neighboring province. Each time two neighboring provinces with lower and higher than 100% expected coverage of cancer cases are selected to be entered in the model. The expected coverage of cancerous patient is reported by medical university of each province. It is assumed that some cancer cases from a province with a lower than 100% expected coverage are registered in their neighboring province with more than 100% expected coverage. RESULTS The condition was true for 21 provinces from a total of 30 provinces of Iran. It was estimated that 43% of gastric cancer cases of North and South Khorasan provinces in north-east of Iran was registered in Razavi Khorasan as the neighboring facilitate province; also 72% misclassification was estimated between Sistan and balochestan province and Razavi Khorasan. The misclassification rate was estimated to be 36% between West Azerbaijan province and East Azerbaijan province, 21% between Ardebil province and East Azerbaijan, 63% between Hormozgan province and Fars province, 8% between Chaharmahal and bakhtyari province and Isfahan province, 8% between Kogiloye and boyerahmad province and Isfahan, 43% Golestan province and Mazandaran province, 54% between Bushehr province and Khozestan province, 26% between Ilam province and Khuzestan province, 32% between Qazvin province and Tehran province(capital of Iran), 43% between Markazi province and Tehran, and 37% between Qom province and Tehran. CONCLUSION Policy makers should consider the regional misclassification in the time of programming for cancer control, prevention and resource allocation.

关键词： Cancer incidence registry Misclassification Bayesian correction Gastric cancer Iran

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Bayesian adjustment of gastric cancer mortality rate in the presence of misclassification

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World Journal of Gastrointestinal Oncology 2017年第4期9卷 160-165页

作者： nastaran hajizadeh Mohamad Amin Pourhoseingholi Ahmad Reza Baghestani Alireza Abadi Mohammad Reza Zali Department of Biostatistics Shahid Beheshti University of Medical Sciences Basic and Molecular Epide-miology of Gastrointestinal Disorders Research Center Research Institute for Gastroenterology and Liver DiseasesShahid Beheshti University of Medical Sciences Gastroenterology and Liver Diseases Research Center Research Institute for Gastroenterology and Liver DiseasesShahid Beheshti University of Medical Sciences

To correct for misclassification error in registering causes of death in Iran death registry using Bayesian method. METHODSNational death statistic from 2006 to 2010 for gastric cancer which reported annually by the Ministry of Health and Medical Education included in this study. To correct the rate of gastric cancer mortality with reassigning the deaths due to gastric cancer that registered as cancer without detail, a Bayesian method was implemented with Poisson count regression and beta prior for misclassified parameter, assuming 20% misclassification in registering causes of death in Iran. RESULTSRegistered mortality due to gastric cancer from 2006 to 2010 was considered in this study. According to the Bayesian re-estimate, about 3%-7% of deaths due to gastric cancer have registered as cancer without mentioning details. It makes an undercount of gastric cancer mortality in Iranian population. The number and age standardized rate of gastric cancer death is estimated to be 5805 (10.17 per 100000 populations), 5862 (10.51 per 100000 populations), 5731 (10.23 per 100000 populations), 5946 (10.44 per 100000 populations), and 6002 (10.35 per 100000 populations), respectively for years 2006 to 2010. CONCLUSIONThere is an undercount in gastric cancer mortality in Iranian registered data that researchers and authorities should notice that in sequential estimations and policy making.

关键词： Misclassification Bayesian method Cause of death Gastric cancer Iran

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Trend of hepatocellular carcinoma incidence after Bayesian correction for misclassified data in Iranian provinces

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World Journal of Hepatology 2017年第15期9卷 704-710页

作者： nastaran hajizadeh Ahmad Reza Baghestani Mohamad Amin Pourhoseingholi Sara Ashtari Zeinab Fazeli Mohsen Vahedi Mohammad Reza Zali Gastroenterology and Liver Diseases Research Center Research Institute for Gastroenterology and Liver DiseasesShahid Beheshti University of Medical Sciences Department of Biostatistics Shahid Beheshti University of Medical Sciences Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center Research Institute for Gastroenterology and Liver DiseasesShahid Beheshti University of Medical Sciences Department of Biostatistics University of Social Welfare and Rehabilitation Sciences

To study the trend of hepatocellular carcinoma incidence after correcting the misclassification in registering cancer incidence across Iranian provinces in cancer registry data. METHODSIncidence data of hepatocellular carcinoma were extracted from Iranian annual of national cancer registration reports 2004 to 2008. A Bayesian method was implemented to estimate the rate of misclassification in registering cancer incidence in neighboring province. A beta prior is considered for misclassification parameter. Each time two neighboring provinces were selected to be entered in the Bayesian model based on their expected coverage of cancer cases which is reported by medical university of the province. It is assumed that some cancer cases from a province that has an expected coverage of cancer cases lower than 100% are registered in their neighboring facilitate province with more than 100% expected coverage. RESULTSThere is an increase in the rate of hepatocellular carcinoma in Iran. Among total of 30 provinces of Iran, 21 provinces were selected to be entered to the Bayesian model for correcting the existed misclassification. Provinces with more medical facilities of Iran are Tehran (capital of the country), Razavi Khorasan in north-east of Iran, East Azerbaijan in north-west of the country, Isfahan in central part and near to Tehran, Khozestan and Fars in south and Mazandaran in north of the Iran, had an expected coverage more than their expectation. Those provinces had significantly higher rates of hepatocellular carcinoma than their neighboring provinces. In years 2004 to 2008, it was estimated to be on average 34% misclassification between North Khorasan province and Razavi Khorasan, 43% between South Khorasan province and Razavi Khorasan, 47% between Sistan and balochestan province and Razavi Khorasan, 23% between West Azerbaijan province and East Azerbaijan province, 25% between Ardebil province and East Azerbaijan province, 41% between Hormozgan province and Fars prov

关键词： Trend of hepatocellular carcinoma Cancer incidence registry Misclassification Bayesian correction

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