title: Breast cancer screening: first round in the population-based program in Valencia, Spain. Collaborative Group of Readers of the Breast Cancer Screening Program of the Valencia Community.
abstract: OBJECTIVE
  To analyze the results of round 1 of the population-based Valencia Breast Cancer Screening Program.
  
  
  METHODS
  In this program, 78,224 (72.98%) of the 107,178 women invited (aged 45-65 years) underwent screening. Complementary views were obtained in 5,771 women (7.38%). Among the total population studied, 3,502 (4.48%) underwent short-term mammographic follow-up studies; 3,898 (4.98%) underwent additional studies and treatment at hospitals. Five hundred eighty-seven women (0.75%) underwent biopsy.
  
  
  RESULTS
  Cancer was detected in 334 patients (4.27 cancers per 1,000 women [3.24 per 1,000 women aged 45-49 years, 6.30 per 1,000 women aged 60-65 years]; six patients with lobular carcinoma in situ excluded). The estimated sensitivity was 89%; specificity, 99%. The positive predictive value of mammography was 8.56%; of mammography with additional examinations, 26.82%; and of biopsy, 56.89%. Forty-one patients (12.28%) had ductal carcinoma in situ; 284 (85.03%) had infiltrating carcinoma. In 73 (25.70%) of the 284 patients, infiltrating carcinomas were smaller than 1 cm. Two hundred twenty-five patients (76.27%) had no lymph node involvement. One hundred seventy-nine (61.09%) had stage 0 or 1 cancer.
  
  
  CONCLUSIONS
  Results are consistent with other published results; differences are due to methods and patient population characteristics.
authors.affiliation: Department of Radiology, University Hospital Dr Peset, Valencia, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Vizcaíno
authors.forename: D
authors.initials: D
authors.lastname: Salas
authors.forename: J S
authors.initials: JS
authors.lastname: Vilar
authors.forename: F
authors.initials: F
authors.lastname: Ruiz-Perales
authors.forename: C
authors.initials: C
authors.lastname: Herranz
authors.forename: J
authors.initials: J
authors.lastname: Ibáñez
mesh_terms: D000368:Aged; D001706:Biopsy / Q000706:statistics & numerical data; D001943:Breast Neoplasms / Q000175:diagnosis / Q000453:epidemiology / Q000517:prevention & control*; D003625:Data Collection / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008327:Mammography / Q000706:statistics & numerical data; D008403:Mass Screening / Q000458:organization & administration / Q000706:statistics & numerical data; D008875:Middle Aged; D010808:Physical Examination; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D013030:Spain / Q000453:epidemiology; D016217:Ultrasonography, Mammary / Q000706:statistics & numerical data