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Squamous Cell Carcinoma of the Breast As a Clinical Diagnostic Challenge 582 MOLECULAR AND CLINICAL ONCOLOGY 8: 582-586, 2018 Squamous cell carcinoma of the breast as a clinical diagnostic challenge KATARZYNA JAKUBOWSKA1, LUIZA KAŃCZUGA‑KODA1, WOJCIECH KISIELEWSKI2, MARIUSZ KODA3 and WALDEMAR FAMULSKI1,2 1Department of Pathomorphology, Comprehensive Cancer Center, 15‑027 Białystok; Departments of 2Medical Pathomorphology and 3General Pathomorphology, Medical University of Białystok, 15‑269 Białystok, Poland Received September 17, 2017; Accepted December 14, 2017 DOI: 10.3892/mco.2018.1581 Abstract. Squamous cell carcinoma (SqCC) of the breast metaplasia of ductal and lobular epithelial cells can be should be differentiated between the primary skin keratinizing linked with fat necrosis and infracted ademonas. Squamous squamous carcinoma and squamous metaplastic cancer. In the cell carcinoma should be differentiated between lesions of current study, the cases of two patients who were diagnosed keratinizing squamous carcinoma and squamous metaplasia with SqCC originated from skin and the breast were discussed. associated to mammary carcinoma (2). The characteristic A fine-needle aspiration biopsy confirmed the presence features of metaplastic cell carcinoma include: i) primary of atypical squamous cells. In both cases, the microscopic carcinoma without other neoplastic components such as ductal examination of the surgical specimen revealed a malignant or mesenchymal elements, ii) the tumor origin is independent neoplasm differentiated into SqCC characterized by keratin- of the overlying skin and nipple and iii) absence of primary izing cancer cells with abundant eosiphilic cytoplasm with epidermoid tumors present in other site (oral cavity, bronchus, large, hyperchromatic vesicular nuclei. Immunohistochemical esophagus, bladder, cervix ect.) (3). However, squamous studies showed negative for progesterone and estrogen recep- metaplastic carcinoma should be also differentiated with pure tors and human epidermal growth factor receptor 2. Moreover, squamous cell carcinoma of skin in the breast. The extensive negative expression of cytokeratin 7 and 20 was confirmed. infiltrate of squamous cancer cells to the skin can make it The diagnosis of the both tumors was established based on the difficult to confirm the cutaneous origin of tumor and exclude detailed analysis of clinical, macroscopical and microscopical the presence of malignant metaplastic changes as a primary information. SqCC localized in the breast is a great diagnostic breast. In the present study, cases of cutaneous squamous cell challenge in pathomorphology and more attention should be carcinoma and primary metaplastic squamous cell carcinoma paid for analysis of such lesions in daily practice. of the breast are described. To our knowledge, such cases are great diagnostic challenge in pathomorphology and should be Introduction carefully analyzed in daily practice. The present study was performed in conformity with the Squamous cell carcinoma (SqCC) is a malignant neoplasm Declaration of Helsinki for Human Experimentation and the of epidermal keratinocytes that arises most commonly on the protocol was approved by the Bioethics Committee of the skin and organs lined with squamous cells. Squamous cell Medical University of Bialystok. Written informed consent carcinoma is a rare form of metaplastic carcinoma in breast was obtained from both participants. that accounts <0.1% (1). The precursor of pure squamous carcinoma is a benign squamous metaplasia that occurs in the Case report epithelium of cysts, fibroadenomas ana phyllodes tumors. It can be also associated with ductal and lobular hyperplasia or Case 1 papillomas. Recent studies confirmed that benign squamous History. A 72-year-old female was admitted to the Department of Surgical Oncology in Bialystok (Poland) for planned surgery. There was no family history of malignant neoplasms. Patient had used some medication against hyper- Correspondence to: Dr Katarzyna Jakubowska, Department of tension. She complained of abdominal pain with normal Pathomorphology, Comprehensive Cancer Center, 12 Ogrodowa peristalsis and had normal stools. She was postmenopausal Street, 15‑027 Białystok, Poland and had given birth to 3 children. Previously, the histo- E-mail: [email protected] logical examination of the biopsy material, obtained during a fine‑needle aspiration (FNA), confirmed the presence of the Key words: squamous cell carcinoma, metaplastic carcinoma, cancer cell infiltrate in the left breast (Fig. 1A). The descrip- breast cancer tion of preoperative, physical examination demonstrated a large mass with ulceration localized on the left breast. Tumor took the three quarters of the breast and raised several years. JAKUBOWSKA et al: SQUAMOUS CELL CARCINOMA OF THE BREAST 583 The skin and the nipple-areola complex were involved. The probably originated from squamous cancer. The change was tumor was attached underlying chest wall. No abnormali- treated as a distant metastases. One month later, imaging ties were observed in the opposite breast nor axilla. Local studies of PET‑CT confirmed an active metabolic process in lymph nodes were not enlarged on palpation examination. the left side of nasopharynx. Patient was qualified for surgery Chest X-ray was performed preoperatively and demonstrated under local anesthesia. Macroscopically, it was visualized the heterogenic, rounded area of increased density, 1.3 cm a smooth mucosa of the nasopharynx without significant diameter in size, located in the right supraclavival field of changes. The histopathological study of the nasopharynx did the left lung. In addition, diaphragm was normal. The preop- not show a presence of cancer cells but only morphological erative blood parameters showed the low levels of red blood features of chronic inflammation markers. Another CT scan cells, hemoglobin and hematocrit and the increased levels of showed numerous secondary changes within both lungs, CA125 and CA15.3. Following normalization of anemia with the largest diameter of 35.0 mm and a single focus in the the concentrate of red blood cells, patient was qualified for segment V of the liver diameter of 24.0 mm. We did not detect scheduled surgery. Due to large size tumor that infiltrated secondary changes in the skeletal system. Disease progression the chest wall, the left radical mastectomy was performed of cancer was revealed. according to the Halsted's method (1). The surgical proce- dure included the removal of the breast tumor with a greater Case 2 pectoral muscle and axilla with local lymph nodes. The left History. A 59‑years‑old woman evaluated in our hospital for breast was reconstructed with the latissimus dorsi musculo- recent onset of pain and tenderness in the left breast. Physical cutaneous flap. There was no postoperative morbidity. The examination revealed a palpable well circumscribed mass clinical staging was T4 N0 MX. in the left upper lateral quadrant. The right breast appeared normal. There was no evidence of supraclavicular or axillary Histopathology. Macroscopically, the postoperative lympadenopathy. The overlying skin was unremarkable. An formalin-fixed material of the left breast 17.0x16.5 cm in ultrasound examination of the left breast revealed a defined size, showed a huge, ulcerative tumor with cauliflower‑like 3.0 cm mass with reduced central echogenicity, consis- appearance, 16.8x16.2 cm in size, of gray-brown surface with tent with a cystic space. Mammography showed a round, a narrow margin at the periphery of the skin without the pres- high‑density mass (without microcalcifications) with almost ence of nipple. On cross-sections, tumor was solid, gray-brown regular margins, measuring approximately 3.0 cm, which was color with gray-white foci of necrosis, coming near this deep classified as BIRADS 4. A fine‑needle aspiration biopsy was incision line. Fourteen local lymph nodes were dissected performed and yielded 0.5 ml of white dense fluid material. with no evidence of metastases. The biggest lymph node was Cytological preparations revealed markedly atypical squa- 3.1x1.8 cm in size. Optimal surgical margins were obtained mous cells arranged in sheets, clusters and as a single cell as (Fig. 2A). well as numerous neutrophils. Several cells were keratinized The microscopic examination of the surgical specimen and some showed degenerative changes (Fig. 1B). revealed a moderately differentiated (G2) squamous cell carci- noma according to WHO Classification of the Skin Tumours (4). Histopathology. The patient had an ultrasound-guided core Cancer cells have abundant eosiphilic cytoplasm with large biopsy of the left breast mass at the local anesthesia. Patient vesicular nucleus. The prominent intracellular brigdes, central underwent radical mastectomy with axillary lymph nodes keratinization and pearl formation were observed. SqCC dissection. Gross examination revealed a 6.0 cm tumor with does not infiltrate along nerve sheaths and lymphovascular central cystic space containing necrotic material (Fig. 2B). vessels. Cancer cells proliferated from the stratified squamous Microscopically, large polygonal cells with keratinizing epithelium covering the breast into 2.5 cm deeper layers of the eosinophilic cytoplasm were presented. Individual cells organ. No other primary site and metastatic disease to breast have abundant eosinophilic cytoplasm and hyperchromatic were ruled out (Fig. 3A and B). Immunohistochemical analysis pleomorphic nuclei with abortive squamous pearl formation confirmed negative nuclear expression of progesterone and (Fig. 3C and
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