en Methodology Methodology پژوهشي Original Article <p style="text-align: justify;"><span style="line-height:2;"><span style="font-family:Arial;"><span style="font-size:14px;"><strong>Background:</strong> This study aimed to estimate the incidence of thyroid cancer and completeness of thyroid cancer case registration in Kerman province, Iran using three source capture-recapture approach during years 2008-2015.<br> <strong>Methods:</strong> All new cases of thyroid cancers reported during 2008-2015 which were registered by pathology, nuclear medicine and medical records were included in this study. Using the personal identifiers, common cases between sources were linked. The log-linear Poisson regression analysis was applied to estimate the number of unregistered cases. The incidence rate per 100,000 population was calculated. To study the trend, Joint-point regression analysis was performed.&nbsp;<br> <strong>Results:</strong> Overall, 1153 new cases of thyroid cancer were reported by three sources. Most cases were female (81/7%). The mean age at diagnosis was 41.53&plusmn;15.69 years. The estimated number of thyroid cancer cases was 1323. The estimated incidence per 100,000 population varied from 4.5 in 2011 to 11 in 2015. The female to male ratio varied from 3.1 in 2015 to 6.7 in 2011. The completeness of registration for all three sources varied from 33.7% in 2008 to 95.1% in 2013. The completeness of medical records, pathology reports, and nuclear medicine reports were 33.1%, 50.7%, and 66.2%, respectively.<br> <strong>Conclusion: </strong>Despite some improvements in completeness of thyroid cancer registration during the study period, there are still fluctuations within the study period. Furthermore, considering each source separately, the completeness of registration is not satisfactory. Therefore, more effort should be done to increase the completeness of thyroid cancer registration specially through the pathology source.</span></span></span></p> Thyroid cancer, Cancer registration, Capture-recapture method, Incidence, Risk factors 78 84 http://ijbc.ir/browse.php?a_code=A-10-639-1&slc_lang=en&sid=1 Vajihe Rouhi rouhivajihe@gmail.com 10031947532846009074 10031947532846009074 No HIV/STI Surveillance Research Center, and WHO Collaborating center for HIV surveillance, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran Yunes Jahani yonesjahani@yahoo.com 10031947532846009075 10031947532846009075 No Modeling in Health Research Center, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran Reza Malekpour Afshar malekpour@kmu.ac.ir 10031947532846009076 10031947532846009076 No Pathology and Stem Cell Research Center, Kerman University of Medical Sciences, Kerman, Iran Hossein Mirshekarpour mirshekarpour@yahoo.com 10031947532846009077 10031947532846009077 No Nuclear Medicine Department of shafah hospital, Kerman University of Medical Sciences and Health services, Kerman, Iran Armita Shahesmaeili a.shahesmaeili@kmu.ac.ir 10031947532846009078 10031947532846009078 Yes HIV/STI Surveillance Research Center, and WHO Collaborating center for HIV surveillance, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran