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Vol. 53. Issue 2.
Pages 113-116 (April - June 2020)
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Vol. 53. Issue 2.
Pages 113-116 (April - June 2020)
Brief report
Basaloid squamous cell carcinoma of the breast
Carcinoma escamoso basaloide de mama
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172
Vicente Marcoa,
Corresponding author
vmarcomolina@gmail.com

Corresponding author.
, Isabel T. Rubiob, Felip Garcíaa, Omar Claveroa,c,d
a Department of Pathology, Hospital Quironsalud Barcelona, Spain
b Instituto Oncológico Baselga, Hospital Quironsalud Barcelona, Spain
c Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Madrid, Spain
d Infections and Cancer Unit, Cancer Epidemiology Research Program, IDIBELL, Institut Català d’Oncologia (ICO)-IDIBELL, CIBERESP, L’Hospitalet de Llobregat, Barcelona, Spain
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Abstract

Basaloid squamous cell carcinoma (BSCC) is a subtype of squamous cell carcinoma that characteristically occurs in the head and neck, may be related to HPV infection and is usually considered to be aggressive. We present the first description of BSCC of the breast. The tumor exhibited characteristic histologic features of BSCC, including nests of basaloid squamous cells with comedonecrosis, abrupt keratinization, and abundant hyaline basement membrane-like material deposition. The tumor showed immunohistochemical features of triple negativity, diffuse p63 positivity, p16 positivity, and Rb negativity. HPV immunogenotyping was negative.

The patient was free of disease after treatment with breast conserving surgery, chemotherapy and radiotherapy. BSCC of the breast should be distinguished from basaloid adenoid cystic carcinoma, triple-negative basal-like breast cancer and nonbasaloid squamous cell carcinoma of the breast based on histology and immunohistochemistry. The prognostic implications of BSCC of the breast should be further studied in larger series.

Keywords:
Basaloid squamous cell carcinoma
Human papilloma virus
Immunohistochemistry
Prognosis
Resumen

El carcinoma escamoso basaloide (CEB) es un subtipo de carcinoma escamoso que se origina normalmente en cabeza y cuello, que puede guardar relación con la infección por el virus del papiloma humano (VPH), y que normalmente se considera agresivo. Presentamos la primera descripción de CEB de la mama. El tumor mostró características histológicas de CEB, incluyendo los nidos de células escamosas basaloides con comedonecrosis, queratinización abrupta y abundante material de depósito tipo membrana basal hialina. El tumor mostró características inmunohistoquímicas de triple negatividad, positividad para p63 difusa, positividad para p16 y negatividad para Rb. La inmunofenotipificación para VPH fue negativa.

La paciente estaba libre de enfermedad tras el tratamiento con cirugía conservadora de mama, quimioterapia y radioterapia. El CEB de mama deberá distinguirse del carcinoma adenoide quístico basaloide, del cáncer de mama de tipo basal triple-negativo y del carcinoma no basaloide escamoso de mama, basado en histología e inmunohistoquímica. Además, las implicaciones pronósticas del CEB de mama deberán estudiarse en series adicionales de mayor tamaño.

Palabras clave:
Carcinoma basaloide escamoso
Virus del papiloma humano
Inmunohistoquímica
Pronóstico

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