Epidemiologic Feature of Thyroid Cancer Based on Cancer Registry Data System

This study was undertaken to define the epidemiological aspects of thyroid carcinoma in iran, an area of endemic iodinedeficiency nearly until recently. the tehran cancer institute data system registry (tcidsr) was used to identify patientswith different histological types of thyroid cancer (tc) in iran. data were analyzed from 438 thyroid cancer cases identifiedby the tcidsr in 1998-99. disease prevalence was calculated by age, time and place. the tcidsr recorded 438 primarymalignancies of the thyroid gland: papillary, follicular, medullary, and anaplastic carcinomas accounted for 67.1%, 10.7%,5.3% and 4.3% of cases, respectively. the remaining 12.6% was classified as od (other diagnoses). the prevalence of tcwas the highest in farsis population. the age range of patients was 8-85 yr. mean patient age was 44.52± 17.03 yr (mean±sd) overall, 47.74± 18.10 yr in male patients and 43.04± 16.34 in female patients. anaplastic (6.5% vs. 3.3%) andmedullary (10.0% vs. 3.0%) cancers were more common in men than women. against expectation for an iodine-deficientarea, the frequency distribution of tumours in our study was closer to that seen in iodine-rich areas. additional research onthe risk factors for thyroid cancer-genetic, ethnic, geographic and environmental is needed to explain the high incidence ofptc overall, and among farsis population in particular, in iran.