title: Neuroendocrine ductal carcinoma in situ (NE-DCIS) of the breast--comparative clinicopathological study of 20 NE-DCIS cases and 274 non-NE-DCIS cases.
abstract: Kawasaki T, Nakamura S, Sakamoto G, Murata S, Tsunoda-shimizu H, Suzuki K, Takahashi O, Nakazawa T, Kondo T & Katoh R (2008) Histopathology53, 288-298Neuroendocrine ductal carcinoma in situ (NE-DCIS) of the breast - comparative clinicopathological study of 20 NE-DCIS cases and 274 non-NE-DCIS cases Aims: To clarify the clinicopathological significance of breast neuroendocrine ductal carcinoma in situ (NE-DCIS), i.e. DCIS in which >50% of cells immunohistochemically express NE markers (chromogranin A and/or synaptophysin), 20 NE-DCIS were studied and the findings compared with those of 274 non-NE-DCIS.
  
  
  RESULTS
  NE-DCIS accounted for 6.8% of all DCIS. Mean patient age was 50.4 years for NE-DCIS and 49.6 years for non-NE-DCIS (P = 0.66). The main clinical presentation of NE-DCIS was a bloody nipple discharge, seen in 72%, significantly different from the 5% in non-NE-DCIS cases (P < 0.01). Carcinoma was preoperatively diagnosed in 67% of NE-DCIS and 95% of non-NE-DCIS cases (P < 0.01). NE-DCIS was histologically characterized by a predominantly solid growth of cancer cells with fine-granular cytoplasm and ovoid, or occasionally spindle-shaped nuclei. A well-developed vascular network was also common. Nuclear grades and Van Nuys classification were significantly lower for NE-DCIS than for non-NE-DCIS (P < 0.01). The mean MIB-1 labelling index was 4.3% in NE-DCIS and 8.1% in non-NE-DCIS (P < 0.01). Furthermore, NE-DCIS cases had significantly higher oestrogen and progesterone receptor and lower HER2 scores than non-NE-DCIS cases (P < 0.01).
  
  
  CONCLUSIONS
  NE-DCIS has characteristic clinicopathological features and can, therefore, be regarded as a distinct variant of DCIS.
authors.affiliation: Department of Human Pathology, University of Yamanashi, Yamanashi, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kawasaki
authors.forename: S
authors.initials: S
authors.lastname: Nakamura
authors.forename: G
authors.initials: G
authors.lastname: Sakamoto
authors.forename: S
authors.initials: S
authors.lastname: Murata
authors.forename: H
authors.initials: H
authors.lastname: Tsunoda-Shimizu
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: O
authors.initials: O
authors.lastname: Takahashi
authors.forename: T
authors.initials: T
authors.lastname: Nakazawa
authors.forename: T
authors.initials: T
authors.lastname: Kondo
authors.forename: R
authors.initials: R
authors.lastname: Katoh
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000473:pathology*; D002278:Carcinoma in Situ / Q000473:pathology*; D018270:Carcinoma, Ductal, Breast / Q000473:pathology*; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000473:pathology*; D018278:Carcinoma, Neuroendocrine / Q000473:pathology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D012189:Retrospective Studies