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Arch Iran Med 2010; 13 (2): 143 – 146

Mini Review

Five Common Cancers in Iran
Shadi Kolahdoozan MD MPH*, Alireza Sadjadi MD MPH**, Amir Reza Radmard MD***, • Hooman Khademi MD MPH *
Iran as a developing nation is in epidemiological transition from communicable to noncommunicable diseases. Although, cancer is the third cause of death in Iran, it`s mortality are on the rise during recent decades. This mini-review was carried out to provide a general viewpoint on common cancers incidence in Iran and to explain incidental differences that may help us to establish early detection programs and investigate population risk factors. A detailed PubMed, Scopus and Google scholar search were made from 2000 to 2009. The basic inclusion criteria were all relevant studies focused on cancer epidemiological data from Iran. Overall age-standard incidence rate per 100 000 population according to primary site is 110.43 in males and 98.23 in females. The five most common cancers (except skin cancer) are stomach, esophagus, colon-rectum, bladder and leukemia in males, and in females are breast, esophagus, stomach, colon-rectum and cervix uteri. The incidence rates of gastrointestinal cancers are high in Iran (it is one of the known areas with a high incidence of GI cancers). Breast cancer mainly affects Iranian women about a decade earlier than Western countries and younger cases are affected by an increasing rate of colorectal cancer in Iran, near the Western rates.
Archives of Iranian Medicine, Volume 13, Number 2, 2010: 143 – 146.

Keywords: Common cancer ● incidence ●Iran ● risk factors Introduction ran, which is located in southwest Asia, is in an epidemiologic transition and faces the double burden of diseases. The demographic and epidemiological transition that is underway will have a significant impact on the pattern of morbidity and mortality in the near and distant future, especially as it affects the emergence of chronic non-communicable diseases, health problems of an aging population and road traffic injuries. In addition, cancer is a major public health problem in Iran. Based on recent reports
Authors' affiliations: *Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran, **Department of Epidemiology, University Medical Center Groningen, Groningen, The Netherland, ***Department of Radialogy, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran. •Corresponding author and reprints: Hooman Khademi MD MPH, Digestive Disease Research Center, Tehran University of Medical Sciences, North Kargar Ave., Shariati Hospital, 1411713135 Tehran, Iran. Tel: +98-21-824-14-824-150-00, Fax: +98-21-824-154-00 E-mail: khademi@ddrc.ac.ir Accepted for publication: 16 December 2009

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from the Ministry of Health and Medical Education (MOHME)1,2; it is the third cause of death in Iran after coronary heart disease and accidents. Unfortunately, few national programs according to the World Health Organization (WHO) guidelines for cancer screening and prevention are active in Iran,3 such as those for colon and gastric cancer. The goals of the first attempts to establish a cancer control program has been followed through prevention, early diagnosis, effective treatment, and palliative care programs; all of which are entire parts of preventing cancer and providing an appropriate care for cancer patients. The target population in this program is not limited to any particular class, age, sex, ethnic, or racial groups. Despite these approved programs, there are many problems: the financial burden of different types of treatment, the advanced stage at presentation of cancer patients, as well as inadequate medical staff training for diagnosis, treatment, palliative care, and psychological care of cancer patients.3 Therefore, it seems that

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Five common cancers in Iran

maximizing web-based systems for communication, education, and collaboration between organizations are needed.3,4 In 1984, the Iranian Parliament passed a bill mandating that physicians and pathology centers report all cancer cases according to the International Classification of Diseases-Oncology (ICD-O) to the Ministry of Health.5 In practice, the principal sources of cancer registries are hospital records and records from diagnostic departments, in particular histopathology.6 When possible, death certificates in which cancer is included as a main or contributory cause of death are also used. In Iran, the National Cancer Registry (NCR) which is only a pathology report band as well as populationbased cancer registry reports from five provinces (Kerman, Golestan, Mazandaran, Ardabil, and Tehran) are the most important sources of collecting information.5,6 Information related to data collection from different cancer registries have been published in various articles. For example A Sadjadi et al.7 in 2005 concluded that the five most common cancers in males [by age-standardized incidence rate (ASR)] were stomach (26.1 per 105), esophagus (17.6), colon- rectal (8.3), bladder (8.0) and leukemia (4.8); and in females, breast (17.1), esophagus (14.4), stomach (11.1), colon-rectal (6.5) and cervix uteri (4.5) were the most common cancers. In addition, these data have suggested that the incidence rates of esophageal and stomach cancers in Iran are well above the world average, while the incidence of lung cancer was very low. Another survey by SM Mousavi et al.6 concluded that the ASR of cancers was 98 and 110 per 100,000 among females and males, respectively. The male to female ratio was 1:1.2. The most common cancers among women and men were breast cancer (24) and stomach cancer (15), respectively. The estimated mortality rate for cancer was 41.1 and 65 per 100,000 for females and males in 2004. Therefore, in Iran, the top five cancers in both sexes (stomach, esophagus, breast, prostate and colon) are described below. Gastric cancer In Iran, most northern and north western areas are at high risk for gastric cancer, whereas the central and western provinces are at medium risk and the southern regions are at a low risk.8 Ardabil, a north western province, has the highest incidence of gastric cancer in Iran with an ASR of 49.1 and

25.4 in men and women, respectively.8 The provinces of Semnan, Golestan, and East Azerbaijan as well as the Tehran metropolitan area also have high rates of gastric cancer in both men and women. In contrast to the northern areas, Kerman, a province in the south, shows a lower incidence rate of gastric cancer with an ASR of 10.2 and 5.1 in men and women.7,8 It is important to know that the higher incidence rate of gastric cancer in Ardabil is due to higher rates of gastric cardia rather than non-cardia cancer, with an incidence of 26.4 and 8.6 in men and women, respectively.8,9 On the other hand, SM Mousavi et al.6 have indicated in their report (based on pathology reports) that the 2005 – 2006 incidence rates of gastric cancer were 15.21 and 8.89 in men and women, respectively. This contrasts other highrisk areas, for example Japan where non-cardia cancer remains as a major form of gastric cancer. The proportion of non-cardia to cardia cancer in low risk areas of Iran such as Khuzestan, south west Iran is high at approximately 85%. A recent study by Abdi-Rad et al.10 has shown that the proportion of people with proximal gastric cancer as compared to those cancers located in the mid and distal third of the stomach in the capital of Iran, Tehran, is increasing. Many environmental factors including smoking, high salt intake, and a diet with an insufficient level of antioxidants are involved in the pathogenesis of gastric cancer.8 Esophageal cancer The north and north east regions of Iran are some of the known areas that have a high incidence of esophageal cancer.11,12 In one early survey by the Iran Cancer Institute, 9% of all cancers and 27% of gastrointestinal cancers were esophageal carcinoma with a male to female ratio of 1.7:1.13 Golestan Province in northeastern Iran is one of the higher risk areas of the world, followed by Mazandaran and Khorasan Provinces.12 As with most other areas of the world, squamous cell cancers constitute >90% of all esophageal cancers in northeastern Iran.12 Mousavi et al.6 has concluded that the incidence rate of esophageal cancer during 2005 – 2006 was 5.83 and 6.25 in males and females, respectively. Several risk factors have been investigated as possible etiologic factors for esophageal squamous cell carcinoma in north eastern Iran,14–16 but very few have been shown to be associated with this disease.17 Earlier studies in Golestan have

144 Archives of Iranian Medicine, Volume 13, Number 2, March 2010

S. Kolahdoozan, A. Sadjadi, A. R. Radmard, et al.

suggested that a low intake of fresh fruits and vegetables, low socioeconomic status, and opium consumption are associated with a higher risk of esophageal cancer.14 In addition, studies have pointed towards the possible role of drinking very hot tea.14 In other words, recurrent thermal injury to the esophageal mucosa due to consumption of large amounts of hot drinks has long been suspected to be a risk factor for esophageal cancer. Public education, nutritional support, and eradication of opium addiction may decrease the morbidity and mortality that result from esophageal cancer.13 Breast cancer In Iran, breast cancer ranks first among cancers diagnosed in women,7 comprising 24.4% of all malignancies with a crude incidence rate and ASR of 17.4 and 23.1 (23.65 in a Mousavi report) per 100,000, respectively.6 Abundant data on the features of breast cancer are available from industrialized countries, but unfortunately studies that report the clinico-pathological features, stages and age distribution of this disease in Iran are rare.18–20 Therefore it is problematic to predict future patterns and perform the most appropriate preventive and therapeutic modalities in order to decrease the burden of this disease in society. The few small studies and reports available in Iran suggest that breast cancer affects Iranian women at least one decade younger than women in developed countries, with the mean age ranging from 47.1 to 48.8 years.18 The first report21 on the incidence and age distribution of breast cancer in Iran has used population-based data extracted from a cancer registry which covered five provinces (Gilan, Mazandaran, Goelstan, Ardabil, and Kerman) during a period of five years (1996 – 2000). Overall, 2421 cases of breast cancer have been documented during the study period. This study has demonstrated that the ASR of breast cancer is low (17.1 per 100,000 person-years), as in most Asian countries whose ASRs are 20.6, 21.8 and 33.3 for Eastern, South-Central and Western Asia, respectively. We should mention that cancer registries should be established to cover a broader spectrum of the population and further studies are needed to map out the exact breast cancer incidence rate and trends over time in order to determine possible environmental, lifestyle and/or genetic risk factors in Iran.18,20 Prostate cancer Relatively little is known about the

epidemiology of prostate cancer in Iranian men. One study from the first report of cancer incidence in Tehran22 shows that prostate cancer is the second most common cancer among men in Tehran, after stomach cancer, with an ASR of 15.6. According to the results of another report23 which has been based on data obtained from cancer registries covering five provinces during the five year period of 1996 to 2000, the ASR of this cancer has been calculated to be 5.1 (9.41 in a Mousavi report during 2005 – 2006) per 100,000 person-years. The age incidence curve of prostate cancer in Iran shows a slow rise with increasing age (after 50 years of age). Hence, the age distribution of prostate cancer in Iran is similar to that of other countries. It seems future investigations are needed to improve our knowledge about the exact state of prostate cancer in Iran and its trends over time. Therefore, expansion of our cancer registry system is necessary in order to identify the true incidence of prostate cancer and its probable geographic disparities in Iran.23 Colon cancer Since the information regarding colon cancer (CC) in Iran is limited, previous studies on CC in Iran 24–26 have demonstrated a very low prevalence, particularly for older individuals and a younger age distribution has been suggested in comparison to Western reports, therefore the burden of this disease will increase dramatically in the near future. It also has some well known hereditary forms.24 The first report on cancer occurrence in Iran published by A Sadjadi et al.23 has demonstrated that CC is the third most common cancer amongst males (ASR: 8.19 – 8.3) and the fourth amongst females (ASR: 6.5 – 7.56). The result of another survey from R Ansari et al.27 regarding incidence and age distribution of colorectal cancer in Iran based on the population-based cancer registry has shown that the ASRs of CC in Iran are between 7 and 8 per 100,000 in both men and women, which are higher than previously reported rates. These incidence rates are close to those reported from other middle-eastern countries and much lower than those seen in western countries. On the other hand, the high frequency of a positive family history of CC in Iranian patients24 indicates that a significant number of CC in Iran arise in immediate family members and other relatives of CC patients.

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Five common cancers in Iran

In spite of these scientific progresses, the rate of screening is very low globally and negligible in both Iran and many other developing countries. This is due to cost, resistance by physicians, patients, and the healthcare system.28 In Iran, screening should at least be started in family members of CC patients at an earlier age with colonoscopy as the preferred screening modality.25

14

15 16

References
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M, Iravani M. Esophageal cancer in Iran. Semin Oncol. 2001; 28: 153 – 157. Islami F, Pourshams A, Nasrollahzadeh D, Kamangar F, Fahimi S, Shakeri R, et al. Tea drinking habits and oesophageal cancer in a high risk area in northern Iran: population based case-control study. BMJ. 2009; 338: b929. doi: 10.1136/bmj.b929. Moradi A. Risk factors associated with esophageal cancer in north of Iran. Saudi Med J. 2008; 29: 785. Hakami R, Mohtadinia J, Etemadi A, Kamangar F, Nemati M, Pourshams A, et al. Dietary intake of benzo (a)pyrene and risk of esophageal cancer in north of Iran. Nutr Cancer. 2008; 60: 216 – 221. Nasrollahzadeh D, Kamangar F, Aghcheli K, Sotoudeh M, Islami F, Abnet CC, et al. Opium, tobacco, and alcohol use in relation to oesophageal squamous cell carcinoma in a high-risk area of Iran. Br J Cancer. 2008; 98: 1857 – 1863. Harirchi I, Karbakhsh M, Kashefi A, Momtahen AJ. Breast cancer in Iran: results of a multi-center study. Asian Pac J Cancer Prev. 2004; 5: 24 – 27. Harirchi I, Ebrahimi M, Zamani N, Jarvandi S, Montazeri A. Breast cancer in Iran: a review of 903 case records. Public Health. 2000; 114: 143 – 145. Rezaianzadeh A, Peacock J, Reidpath D, Talei A, Hosseini SV, Mehrabani D. Survival analysis of 1148 women diagnosed with breast cancer in southern Iran. BMC Cancer. 2009; 9: 168. Fallah M. Cancer incidence in five provinces of Iran, Ardebil, Gilan, Mazandaran, Golestan and Kerman, 1996 – 2000. Available from: URL: http://acta.uta.fi/pdf/978951-44-6876-6.pdf Mohagheghi MA, Mosavi-Jarrahi A, Malekzadeh R, Parkin M. Cancer incidence in Tehran metropolis: the first report from the Tehran Population-based Cancer Registry, 1998 – 2001. Arch Iran Med. 2009; 12: 15 – 23. Sadjadi A, Nooraie M, Ghorbani A, Alimohammadian M, Zahedi MJ, Darvish-Moghadam S, et al. The incidence of prostate cancer in Iran: results of a population-based cancer registry. Arch Iran Med. 2007; 10: 481 – 485. Malekzadeh R, Bishehsari F, Mahdavinia M, Ansari R. Epidemiology and molecular genetics of colorectal cancer in Iran: a review. Arch Iran Med. 2009; 12: 161 – 169. Azadeh S, Moghimi-Dehkordi B, Fatem SR, Pourhoseingholi MA, Ghiasi S, Zali MR. Colorectal cancer in Iran: an epidemiological study. Asian Pac J Cancer Prev. 2008; 9: 123 – 126. Moghimi-Dehkordi B, Safaee A, Zali MR. Prognostic factors in 1,138 Iranian colorectal cancer patients. Int J Colorectal Dis. 2008; 23: 683 – 688. Ansari R, Mahdavinia M, Sadjadi A, Nouraie M, Kamangar F, Bishehsari F, et al. Incidence and age distribution of colorectal cancer in Iran: results of a population-based cancer registry. Cancer Lett. 2006; 240: 143 – 147. Mousavi SM. Toward prostate cancer early detection in Iran. Asian Pac J Cancer Prev. 2009; 10: 413 – 418.

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...Breast Cancer I took the breast cancer health assessment through the University of Phoenix Life Resource Center. The results from the health risk assessment estimated my risk for developing breast cancer on a scale of average women. It also makes you aware of which factors may contribute to my risk and what can do be done to reduce these factors. I can also take more cancer risk profiles. This will create a picture of a specific cancer and what action I can take to reduce my chances of developing cancer. Through years of research and testing there has not been a cure for breast cancer. Breast cancer is caused by a malignant tumor or a group of cancer cells that starts in the breast producing milk in the glands. This tumor invades the normal tissue of the breast and spreads throughout distant areas of the body. This disease is known to attack women but men can get this disease as well. According to Breastcancer.org, about 1 in 8 women in the U.S. will develop cancer over the course of her lifetime. The lifetime risk for a man is 1 in 1,000 (U.S. Breast Cancer Statistics, 2012). There are many risk factors that may increase your chances of developing breast cancer such as family history, genetics, age, women, and weight to name a few. Some risk factors are controllable and others are not in our control. Weight is a factor that can be controlled by you. Being overweight can increases your risk for breast cancer. Proper diet and exercise can help reduce...

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Breast Cancer

...Speaking Assignment 7 Breast Cancer Breast Cancer is the most common cancer among American women. One in every eight women in the United States develops breast cancer. There are many types of breast cancer that differ in their capability of spreading (metastasizing) to other body tissues. The causes of breast cancer are not yet fully known although a number of risk factors have been identified. There are many different types of breast cancer. They are Tubular Carcinoma, Medullary Carcinoma, Mucinous Carcinoma, Papillary Carcinoma, and Cribriform Carcinoma. Breast Cancer is diagnosed with physician and self-examination of the breasts, mammography, ultra sound testing, and biopsy. Treatments of breast cancer includes chemotherapy, and radiation. Depending on the stage your cancer is in will let the oncologist know what type of treatment you need. Your breast can be painful because of the lump, you may also notice a bloody discharge from your nipple. Over 200,000 new cases of invasive breast cancer are diagnosed each yearly nearly 40,000 women are expected to die of breast cancer in 2012. There are over 2.5 million breast cancer survivors in the United States. Hutchinson Center researchers are reducing breast cancer incidence and death by identifying risk factors for the disease. Developing new methods of detecting its presence and helping to predict health outcomes based on a woman’s genetics and other factors. Breast cancer is the most common malignancy...

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Breast Cancer

...Breast cancer is a malignant tumor that starts in the cells of the breast. A malignant tumor is a group of cancer cells that can grow into and invade surrounding tissues or spread to distant areas of the body (American Cancer Society, 2015). The disease occurs almost entirely in women, but men can also get it. Although breast cancer can affect both men and women, it is much more dominant in women. The risk for developing breast cancer is the highest in women over the age of 50, and it is higher for women who also have a family history of breast cancer (Breastcancer.com, 2015). Breast cancer is the most common cancer in women worldwide. It’s a devastating disease, and thousands of cases of breast cancer are reported to occur among women around the world each year. Breasts contain the mammary glands which are the organs of milk production. Breasts mostly consist of adipose tissue. The breast is made up of sections, which are called lobes and each of these lobes are made up of smaller lobules, which produce milk in women (Breast Anatomy, 2015). Both the lobes and lobules are connected by milk ducts and the milk ducts carry the milk to the nipple. The lobules and ducts are located throughout the fibrous tissue and adipose tissue that make up the main mass of the breast (Breast Anatomy, 2015). Most cancers of the breast arise from the epithelium, which form the lobules and terminal ducts (Seeley, 2011 p 1042). There are a few different types of breast cancers that...

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Breast Cancer

...Breast Cancer Diona Curtis SPEECH 200 October 21, 2013 Breast Cancer Breast cancer is a kind of cancer that develops in the breast. It occurs when a malignant tumor starts in the cells of the breast. A malignant tumor is a group of cancer cells that invade surrounding tissues and can spread to other areas of the body. There are two forms of breast cancer, invasive and non-invasive. Invasive cancer is the serious form of breast cancer. Invasive cancer is when the cells break out of the breast area and begins to invade other tissue surrounding it. Eventually, the cells make their way to other parts of the body such as bone and organs; which is called metastasis. The abnormal cells can travel through the bloodstream and our lymph system early-on or later. Non-invasive cancer is when the cells have not left its place of origin yet. Non-invasive cancer can also be referred to as “pre-cancerous”. It can be referred to that because although it is has not left its origin, it can eventually develop into invasive cancer. Cancer can spread three different ways: tissue, lymph system, and the blood. The signs and symptoms of breast cancer vary depending on the body of the patient. The symptoms can only be felt by the patient and described to the doctor or nurse according to what they are feeling. A sign is when the patient and other people can detect a problem. Usually the first symptoms signs and symptoms of breast cancer are pain, headaches, and a lump. Other possible early signs...

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Breast Cancer

...5.0 Treatment and prevention of breast cancer 5.1 Prevention is better than cure: 5.1.1 Breastfeeding There are plenty of ways that might help to prevent breast cancer. Firstly, breastfeeding has played a very important part in breast cancer prevention, which is the longer the period of breastfeeding, the higher the protection of the mother and child (Mayoclinic.org, 2015). According to Komen, (2010), breastfeeding for one year might slightly reduce the chances to get breast cancer than those who never breastfed, however, mothers who breastfed for a duration of two years will have a result of twice the benefit of those who breastfed for one year. Besides, a research done by National Cancer Institute (NCI), (n.d.) shows that women who breastfeed have a lower risk to cause breast cancer, which is an overall decreased by 35% risk of breast cancer. Moreover, 5,000 cases of breast cancer can be avoided, if the new mums followed of the recommended instruction that pursue them to breastfeed their children for at least one year (Rochman, 2012). 5.1.2 Consistent medical checkup and keep weight in check Furthermore, a second way to prevent breast cancer is keeping weight in check and consistent medical checkup. According to Mayoclinic.org, (2015), states that overweight or obese women have higher risks to get breast cancer or recurrence than those have a healthy weight. A research prepared by Cancerresearchuk.org, (2012) mentioned that women who have a regular exercise about half...

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