title: Risk factors for malignancy in benign papillomas of the breast on core needle biopsy.
abstract: BACKGROUND
  This study was designed to evaluate the clinical and pathologic parameters of benign papillomas diagnosed on core needle biopsy (CNB) and predict malignancy risk after surgical excision.
  
  
  METHODS
  We retrospectively reviewed clinicopathologic findings for 160 CNB-diagnosed benign papillomas followed by surgical excision from 154 patients.
  
  
  RESULTS
  Ten (6.3%) of the excised lesions were diagnosed as malignant. Univariate analysis showed that those that were palpable on physical examination, detected as a mass on mammography, or >1 cm on sonography were significantly associated with malignancy. In multivariate analysis, lesions that were palpable (odds ratio (OR), 29.2; 95% confidence interval (CI), 4.06-209.58; P = 0.001) or detected as a mass (OR, 5.68; 95% CI 1.08-29.87; P = 0.04) remained significantly associated with malignancy. In a CART analysis, including all variables, lesions that were palpable and associated with a mass on mammogram were confirmed as malignant.
  
  
  CONCLUSIONS
  Breast lesions diagnosed as benign papillomas on CNB had a 6.3% risk of being malignant. The risk was highest for lesions that were palpable and detectable as a mass on a mammogram. In addition, the low-risk patients avoid immediate surgical excision, although they should be followed carefully.
authors.affiliation: Center for Breast Cancer, Research Institute and Hospital, National Cancer Center, 111 Jungbalsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do, 410-769, Republic of Korea. goje1@medimail.co.kr
authors.forename: So-Youn
authors.initials: SY
authors.lastname: Jung
authors.forename: Han-Sung
authors.initials: HS
authors.lastname: Kang
authors.forename: Youngmee
authors.initials: Y
authors.lastname: Kwon
authors.forename: Sun Young
authors.initials: SY
authors.lastname: Min
authors.forename: Eun-A
authors.initials: EA
authors.lastname: Kim
authors.forename: Kyoung Lan
authors.initials: KL
authors.lastname: Ko
authors.forename: Seeyoun
authors.initials: S
authors.lastname: Lee
authors.forename: Seok Won
authors.initials: SW
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle; D001943:Breast Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D016009:Chi-Square Distribution; D005260:Female; D006801:Humans; D016015:Logistic Models; D008327:Mammography; D008875:Middle Aged; D010173:Palpation; D010212:Papilloma / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D011230:Precancerous Conditions / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D012189:Retrospective Studies; D012307:Risk Factors; D018084:Ultrasonography, Interventional; D016217:Ultrasonography, Mammary