Abstract 266: Trends in age distribution of breast cancer, in north east of Iran: Report of six thousand patients over 30 years

Aim: This study was aimed to evaluate the age at the time of diagnosis of breast cancer and it’s probably changes in distribution among patients during 30 years.

Methods: This cross- sectional study was conducted in Mashhad, Iran from 1981 until 2011. The data of patients were obtained from case records. The duration of study was categorized into three periods: 1981-1990, 1991-2000 and 2001-2011. SPSS software was used for analyses. The difference was considered significant if P<0.05.

Result: From 6274 breast cancer cases, 174 patients were male (2.5%) and the others 6100 were female (97.5%).Mean age at the time of diagnosis was 49.07 ± 12.07 years (male: 56.48 ± 14.14, female: 48.8 ±12.01). There was significant difference in age by sex (p <0.001). Table 1 presents the mean age of studied patients in each 10 years of study. ANOVA test showed that there was not statistical significant difference (P value= 0.1).

DecadesFrequencyMean ageSDYoungestOldest1981-199046747.9712.04318882000-1991177149.0312.33820992001-2011394949.2211.9542098

The most histologic type of breast cancer was ductal carcinoma 65.6% others percent in order were: NOS 19.6%, lobular 3.7%, medullary 2.8%, adenocarcinoma 2.8%, tubular and papillary 0.2% and 5.1% of other types. Relative frequency of histologic types had significant differences among 3 intervals (p <0.001), the frequency of adenocarcinoma was decreasing but ductal carcinoma was increasing during 3 decades. Mean age of ductal carcinoma, lobular, medullary and adenocarcinoma was 48.9±11.8, 50.6±12.4, 46.4±11.4, 50.2±11.9, respectively. Mean age had significant differences among these main histologic types (p =0.002).98% of patients were urban and 2% were rural. Mean age of these 2 groups has statistical significant difference (P = 0.001) and is 10 years older in rural patients. Frequency of people who live in urban area was increased significantly (p<00.1) during these 30 years compare with rural area.

Conclusion: breast cancer occurs in Iranian women at least one decade younger than women in developed countries we found no change in mean age of diagnosis of breast cancer during these 30 years from 1981 to 2011.

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Note: This abstract was not presented at the meeting.

Citation Format: Maryam Salehi, Soodabeh Shahidsales, Mehdi Seilaniantousi, Gholamhosein Noferesti, Mahta Salehi, Amirhossein mohammadian bajgiran. Trends in age distribution of breast cancer, in north east of Iran: Report of six thousand patients over 30 years [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 266. doi:10.1158/1538-7445.AM2017-266