| IJCEP Copyright © 2007-All rights reserved. |
Int J Clin Exp Pathol 2013;6(6):1177-1179
Case Report
Pathologic diagnosis of large cell neuroendocrine carcinoma of the lung in an axillary
lymph node: a case report with immunohistochemical and molecular genetic studies
Tadashi Terada
Department of Pathology, Shizuoka City Shimizu Hospital, Shimizu, Shizuoka, Japan
Received September 23, 2012; Accepted March 27, 2013; Epub May 15, 2013; Published June 1, 2013
Abstract: The author herein reports a large cell neuroendocrine carcinoma (LCNEC) of the lung diagnosed in an axillary lymph node without
clinical data, with an emphasis of KIT and PDGFRA. A 64-year-old woman presented with axillary and cervical lymph nodes swelling. An
excisional biopsy of an axillary lymph node was performed under the clinical diagnosis of malignant lymphoma. The HE section showed a
presence of large malignant cells arranged in a medullary pattern. The tumor cells had nucleoli. The HE diagnosis was large cell lymphoma or
metastatic undifferentiated carcinoma, in particular large cell carcinoma of the lung. The tumor cells were positive for cytokeratins, p53 protein,
thyroid transcriptional factor-1, neuron-specific enolase, synaptophysin, CD56, KIT, and PDGFRA. In contrast, they were negative for CD3,
CD15, CD30, CD45, CD20, CD45RO, CEA, CA19-9, and chromogranin (Dako). Ki-67 labeling (Dako) was 100%. Therefore, a diagnosis of
LCNEC of the lung was made. A molecular genetic analysis for KIT (exons 9, 11, 13, and 17) and PDGFRA (exons 12 and 18) identified no
mutations. Later, a lung tumor and pleural effusion were detected, and the cytology of the effusion and sputum revealed carcinoma cells
compatible with LCNEC. The patient was diagnosed as lung LCNEC, and treated by chemotherapy (cisplatin) and radiation (45 Gray). The
present report is the first one with an examination of protein expression and gene mutations of KIT and PDGFRA in a metastatic focus of
LCNEC of the lung. (IJCEP1209024).
Keywords: LCNEC, KIT, PDGFRA, metastasis
Address correspondence to: Dr. Tadashi Terada, Department of Pathology, Shizuoka City Shimizu Hospital, Miyakami 1231 Shimizu-Ku,
Shizuoka 424-8636, Japan. Tel: 81-54-336-1111; Fax: 81-54-336-1315; E-mail: piyo0111jp@yahoo.co.jp
Case Report
Pathologic diagnosis of large cell neuroendocrine carcinoma of the lung in an axillary
lymph node: a case report with immunohistochemical and molecular genetic studies
Tadashi Terada
Department of Pathology, Shizuoka City Shimizu Hospital, Shimizu, Shizuoka, Japan
Received September 23, 2012; Accepted March 27, 2013; Epub May 15, 2013; Published June 1, 2013
Abstract: The author herein reports a large cell neuroendocrine carcinoma (LCNEC) of the lung diagnosed in an axillary lymph node without
clinical data, with an emphasis of KIT and PDGFRA. A 64-year-old woman presented with axillary and cervical lymph nodes swelling. An
excisional biopsy of an axillary lymph node was performed under the clinical diagnosis of malignant lymphoma. The HE section showed a
presence of large malignant cells arranged in a medullary pattern. The tumor cells had nucleoli. The HE diagnosis was large cell lymphoma or
metastatic undifferentiated carcinoma, in particular large cell carcinoma of the lung. The tumor cells were positive for cytokeratins, p53 protein,
thyroid transcriptional factor-1, neuron-specific enolase, synaptophysin, CD56, KIT, and PDGFRA. In contrast, they were negative for CD3,
CD15, CD30, CD45, CD20, CD45RO, CEA, CA19-9, and chromogranin (Dako). Ki-67 labeling (Dako) was 100%. Therefore, a diagnosis of
LCNEC of the lung was made. A molecular genetic analysis for KIT (exons 9, 11, 13, and 17) and PDGFRA (exons 12 and 18) identified no
mutations. Later, a lung tumor and pleural effusion were detected, and the cytology of the effusion and sputum revealed carcinoma cells
compatible with LCNEC. The patient was diagnosed as lung LCNEC, and treated by chemotherapy (cisplatin) and radiation (45 Gray). The
present report is the first one with an examination of protein expression and gene mutations of KIT and PDGFRA in a metastatic focus of
LCNEC of the lung. (IJCEP1209024).
Keywords: LCNEC, KIT, PDGFRA, metastasis
Address correspondence to: Dr. Tadashi Terada, Department of Pathology, Shizuoka City Shimizu Hospital, Miyakami 1231 Shimizu-Ku,
Shizuoka 424-8636, Japan. Tel: 81-54-336-1111; Fax: 81-54-336-1315; E-mail: piyo0111jp@yahoo.co.jp
 | |  | |  | |  | |  | |  |
