title: Fibroepithelial lesions with cellular stroma on breast core needle biopsy: are there predictors of outcome on surgical excision?
abstract: Fibroepithelial lesions with cellular stroma (FELCS) in breast core needle biopsy (CNB) specimens may result in either fibroadenoma or phyllodes tumor at excision. We evaluated histologic features, proliferation indices (by Ki-67 and topoisomerase II a immunostaining) and p53 expression in 29 cases of FELCS in CNB specimens and correlated these with excision findings in a blinded manner. On excision, 16 patients had fibroadenomas and 12 had phyllodes tumors. All CNB specimens with mildly increased stromal cellularity were fibroadenomas on excision (n=4), and all with markedly cellular stroma were phyllodes tumors (n=4). Among CNB specimens with moderate cellularity (12 fibroadenomas and 8 phyllodes tumors), only stromal mitoses were discriminatory histologically. Stromal proliferation indices were significantly higher in CNB that were phyllodes tumors vs fibroadenomas. Assessment of stromal cellularity, mitoses, and proliferation indices might help determine the probability of phyllodes tumor occurring and guide management of these cases.
authors.affiliation: Department of Pathology, Virginia Mason Medical Center, Seattle, WA 98101, USA.
authors.forename: Timothy W
authors.initials: TW
authors.lastname: Jacobs
authors.forename: Yunn-Yi
authors.initials: YY
authors.lastname: Chen
authors.forename: Donald G
authors.initials: DG
authors.lastname: Guinee
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Holden
authors.forename: Imok
authors.initials: I
authors.lastname: Cha
authors.forename: Donald E
authors.initials: DE
authors.lastname: Bauermeister
authors.forename: Beverly
authors.initials: B
authors.lastname: Hashimoto
authors.forename: Dulcy
authors.initials: D
authors.lastname: Wolverton
authors.forename: Grady
authors.initials: G
authors.lastname: Hartzog
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001707:Biopsy, Needle; D001940:Breast / Q000473:pathology*; D001943:Breast Neoplasms / Q000473:pathology*; D005260:Female; D018226:Fibroadenoma / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D003557:Phyllodes Tumor / Q000473:pathology*