Salivary duct carcinoma

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Salivary duct carcinoma, abbreviated SDC, is a rare salivary gland tumour that typically has an aggressive course.

Salivary duct carcinoma
Diagnosis in short

General

  • Malignant counterpart of salivary duct adenoma.
  • Male:female ~= 4:1.
  • Dismal prognosis.[1]
  • Typically >50 years old.
  • Mostly in the parotid.

Microscopic

Features - resembles ductal breast carcinoma:[1]

  • Architecture: sheets, nests, cords, cribriform, micropapillary.
  • Neoplastic cells line-up around cystic spaces "Roman bridges".
  • Nuclear atypia (variation in size, shape, staining).
  • Apocrine snouts - pseudopod-like/lollipop-like undulations of the cell membrane.
  • Decapitation secretions - apocrine snouts (membrane bound blobs of cytoplasm) that have separated from its mother cell.

Notes:

  • Similar to ductal breast carcinoma - key to remember.

DDx:

Images

www:

Subtypes

  • Conventional.
  • Mucinous - worse prognosis; opposite of what would one expect from the outcomes in breast cancer.
  • Micropapillary - assoc. with a poor prognosis.
  • Sarcomatoid/spindle cell.

IHC

  • LMWK, EMA, CK7, CK19 +ve.
  • p63 -ve.
  • Androgen receptor +ve.
  • BRST2 (GCDFP-15) +ve.
  • HER2 +ve ~21%; use of trastuzumab (Herceptin) not systematically studied.

Curiosity:

  • PSA +/-.
  • PSAP +/-.
  • ER-beta +ve.[2]
  • ER-alpha -ve (the common ER stain).

See also

References