Apocrine carcinoma of the breast

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Apocrine carcinoma of the breast
Diagnosis in short
LM apocrine morphology (cells with prominent nucleoli - may be multiple, abundant granular eosinophilic cytoplasm) - must be >=90% of tumour, loss of basal cells
LM DDx glycogen-rich clear cell carcinoma of the breast
IHC AR +ve, GCDFP-15 +ve, ER -ve, PR -ve
Site breast - see invasive breast cancer
Prevalence uncommon

Apocrine carcinoma of the breast is a rare form of invasive breast cancer.

General

  • Need >=90% apocrine morphology.[1]

Microscopic

Features:[1]

  • Prominent nucleoli.
    • Often multiple.[2]
  • Abundant granular eosinophilic cytoplasm.
  • Architecture like invasive ductal carcinomas no special type.

DDx:

  • Glycogen-rich clear cell carcinoma of the breast.
  • Cutaneous Apocrine Carcinoma
      • A possible cutaneous apocrine carcinoma in a patient with a history of mammary apocrine carcinoma is problematic but fortunately a relatively infrequent conundrum.

Images

www:

  • Breast - Apocrine Carcinoma - Low power (SKB)

  • Breast - Apocrine Carcinoma - Perineural invasion - High power (SKB)

  • Breast - Apocrine Carcinoma - Low power (SKB)

  • Breast - Apocrine Carcinoma - Medium power (SKB)

  • Breast - Apocrine Carcinoma - High power (SKB)

  • Breast - Apocrine Carcinoma - High power (SKB)

IHC

Smaller tumours classically:[3]

Usually:[1]

  • ER -ve.
  • PR -ve.
  • often Her2 -ve

Notes

  • Salivary gland carcinoma and cutaneous adnexal tumors can show a similar IHC profile.
  • Apocrine carcioma can be a non-basal type 'triple negative carcinoma' identified by both morphology and AR positivity[4].
    • May show different behaviour to other types of triple negative carcinoma
    • May respond to treatments targeting the androgen receptor[5]
    • Be carefull when reading the literature in this area - is the author discussing 'molecular apocrine', 'IHC apocrine' or 'morphologic apocrine' carcinoma. Many ductal carcinomas, NOS will show AR positivity.

See also

References

  1. ↑ 1.0 1.1 1.2 O'Malley, Frances P.; Pinder, Sarah E. (2006). Breast Pathology: A Volume in Foundations in Diagnostic Pathology series (1st ed.). Churchill Livingstone. pp. 217. ISBN 978-0443066801.
  2. ↑ O'Malley, FP.; Bane, A. (Jan 2008). "An update on apocrine lesions of the breast.". Histopathology 52 (1): 3-10. doi:10.1111/j.1365-2559.2007.02888.x. PMID 18171412.
  3. ↑ Honma, N.; Takubo, K.; Akiyama, F.; Sawabe, M.; Arai, T.; Younes, M.; Kasumi, F.; Sakamoto, G. (Aug 2005). "Expression of GCDFP-15 and AR decreases in larger or node-positive apocrine carcinomas of the breast.". Histopathology 47 (2): 195-201. doi:10.1111/j.1365-2559.2005.02181.x. PMID 16045781.
  4. ↑ Tsutsumi, Y. (May 2012). "Apocrine carcinoma as triple-negative breast cancer: novel definition of apocrine-type carcinoma as estrogen/progesterone receptor-negative and androgen receptor-positive invasive ductal carcinoma.". Jpn J Clin Oncol 42 (5): 375-86. doi:10.1093/jjco/hys034. PMID 22450930.
  5. ↑ Safarpour, D.; Tavassoli, FA. (Oct 2014). "A Targetable Androgen Receptor-Positive Breast Cancer Subtype Hidden Among the Triple-Negative Cancers.". Arch Pathol Lab Med. doi:10.5858/arpa.2014-0122-RA. PMID 25310144.
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