Primary Squamous Cell Carcinoma of the Breast: A Rare Case Report

α
Dr. Welington Lombardi
Dr. Welington Lombardi
σ
Maria Clara Vieira Martinez
Maria Clara Vieira Martinez
ρ
Isabella Franco Barbosa Pesce
Isabella Franco Barbosa Pesce
Ѡ
Pietra Lopes Monti
Pietra Lopes Monti
¥
Letícia Dalavale Fabretti
Letícia Dalavale Fabretti
§
Roseane Rigo
Roseane Rigo
χ
Daniela Videira Botton
Daniela Videira Botton
ν
Thais Luiza Pavan Martins
Thais Luiza Pavan Martins
Ѳ
Vitória Ribeiro Farinha
Vitória Ribeiro Farinha
ζ
Carla de Freitas
Carla de Freitas
£
Flávia Vicentin Silva
Flávia Vicentin Silva
Luciana Borges Lombardi
Luciana Borges Lombardi
α Universidade De Araraquara Uniara, Universidade De Araraquara Uniara,

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Primary Squamous Cell Carcinoma of the Breast: A Rare Case Report

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Abstract

Primary squamous cell carcinoma (SCC) of the breast is a rare type of cancer, representing between 0.06% and 0.2% of malignant breast tumors. The disease presents with rapid growth and an aggressive pattern, and the lack of well-defined therapeutic protocols hinders its treatment. The following is a case report of a 64-year-old patient referred due to the appearance of a nodule in her left breast with progressive growth. On physical examination, she presented with a large breast mass (>10 cm) and palpable axillary lymph nodes. Core biopsy identified the lesion as poorly differentiated carcinoma, staged as T4d N1 Mx (inflammatory). The patient was referred for neoadjuvant chemotherapy with paclitaxel and carboplatin, but experienced tumor progression during chemotherapy and was referred for a hygienic mastectomy. The histopathological result showed an invasive carcinoma with squamous differentiation, grade 3, ulcerated with invasion of the pectoral muscle and free margins (pT4b pNx pMx). Only after immunohistochemistry was it confirmed that it was, in fact, a keratinizing squamous cell carcinoma (SCC). Postoperatively, the patient returned with signs of surgical wound dehiscence and pleuropulmonary and mediastinal metastatic progression. After multidisciplinary and family discussion, exclusive palliative care was instituted. Primary SCC of the breast presents with an aggressive clinical picture and a challenging diagnosis, requiring histopathological and immunohistochemical confirmation. The gold standard of treatment includes surgery with free margins, but there is no consensus regarding adjuvant chemotherapy. The prognosis is guarded, especially in locally advanced or metastatic cases

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

Maria Clara Vieira Martinez, Isabella Franco Barbosa Pesce, Pietra Lopes Monti, Letícia Dalavale Fabretti, Roseane Rigo, Daniela Videira Botton, Thais Luiza Pavan Martins, Vitória Ribeiro Farinha, Carla de Freitas, Flávia Vicentin Silva, Luciana Borges Lombardi. 2026. \u201cPrimary Squamous Cell Carcinoma of the Breast: A Rare Case Report\u201d. Global Journal of Medical Research, Global Journal of Medical Research - F: Diseases GJMR-F Volume 26 (GJMR Volume 26 Issue F1): .

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Journal Specifications

Crossref Journal DOI 10.17406/gjmra

Print ISSN 0975-5888

e-ISSN 2249-4618

Classification
LCC Code: RC280.B8
Version of record

v1.2

Issue date

April 4, 2026

Language
English
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Published Article

Primary squamous cell carcinoma (SCC) of the breast is a rare type of cancer, representing between 0.06% and 0.2% of malignant breast tumors. The disease presents with rapid growth and an aggressive pattern, and the lack of well-defined therapeutic protocols hinders its treatment. The following is a case report of a 64-year-old patient referred due to the appearance of a nodule in her left breast with progressive growth. On physical examination, she presented with a large breast mass (>10 cm) and palpable axillary lymph nodes. Core biopsy identified the lesion as poorly differentiated carcinoma, staged as T4d N1 Mx (inflammatory). The patient was referred for neoadjuvant chemotherapy with paclitaxel and carboplatin, but experienced tumor progression during chemotherapy and was referred for a hygienic mastectomy. The histopathological result showed an invasive carcinoma with squamous differentiation, grade 3, ulcerated with invasion of the pectoral muscle and free margins (pT4b pNx pMx). Only after immunohistochemistry was it confirmed that it was, in fact, a keratinizing squamous cell carcinoma (SCC). Postoperatively, the patient returned with signs of surgical wound dehiscence and pleuropulmonary and mediastinal metastatic progression. After multidisciplinary and family discussion, exclusive palliative care was instituted. Primary SCC of the breast presents with an aggressive clinical picture and a challenging diagnosis, requiring histopathological and immunohistochemical confirmation. The gold standard of treatment includes surgery with free margins, but there is no consensus regarding adjuvant chemotherapy. The prognosis is guarded, especially in locally advanced or metastatic cases

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Primary Squamous Cell Carcinoma of the Breast: A Rare Case Report

Maria Clara Vieira Martinez
Maria Clara Vieira Martinez
Isabella Franco Barbosa Pesce
Isabella Franco Barbosa Pesce
Pietra Lopes Monti
Pietra Lopes Monti
Letícia Dalavale Fabretti
Letícia Dalavale Fabretti
Roseane Rigo
Roseane Rigo
Daniela Videira Botton
Daniela Videira Botton
Thais Luiza Pavan Martins
Thais Luiza Pavan Martins
Vitória Ribeiro Farinha
Vitória Ribeiro Farinha
Carla de Freitas
Carla de Freitas
Flávia Vicentin Silva
Flávia Vicentin Silva
Luciana Borges Lombardi
Luciana Borges Lombardi

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