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Eiji Nakajima
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P1.02 - Biology/Pathology (ID 614)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Biology/Pathology
- Presentations: 1
- Moderators:
- Coordinates: 10/16/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)
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P1.02-025 - A Case of Primary Peripheral Epithelial–Myoepithelial Carcinoma of the Lung (ID 8384)
09:30 - 09:30 | Author(s): Eiji Nakajima
- Abstract
Background:
Primary epithelial-myoepithelial carcinoma (EMC) of the lung is extremely rare carcinoma of salivary type lung cancer. Only 16 cases were reported for peripheral pulmonary EMC in literatures in the world, at present.
Method:
We report a resected case of primary peripheral EMC of the lung existed in right S2 with considerations of literature.
Result:
The patient was 63-year old male, received medical check-up at nearby clinic and an abnormal shadow was pointed out on chest X-ray film. He was referred to our hospital for more detailed examinations and therapy. He had no past history, symptoms nor abnormal physical findings. Chest CT scan showed a 56 x 24 mm mass in right S2. Transbronchial lung biopsy (TBLB) was performed and the tumor was diagnosed as adenoid cystic carcinoma. There was no metastasis to other organs in detailed examinations. Right upper lobectomy and lymph node dissection (ND2a-2) was performed. He was discharged our hospital at 8 post operative days with no post-operative complications. Macroscopically the tumor was 32x30x22 mm in size, white-colored, homogeneous, and well-defined surrounding pulmonary substance. Microscopically the tumor was composed of double tubular layers. Inner tubular layer showed epithelial cell characteristics, whereas the outer layer showed myoepithelial cell characteristics. Immunohistochemical examinations revealed positive for cytokeratin AE1/3 at inner tubular layer, and positive for SMA, p63, and calponin at outer tubular layer. Finally, the diagnosis of the tumor was determined as peripheral pulmonary EMC. There were no metastases in dissected lymph nodes. Epidermal growth factor receptor (EGFR) was wild type and anaplastic lymphoma kinase (ALK) was negative. Pathological stage was IB because of T2aN0M0. He was followed up with no adjuvant therapy, and disease free for 2 years after operation.
Conclusion:
Primary salivary gland type tumors of the lung are rare. Among them, primary peripheral EMC is extremely rare. Differential diagnoses of pulmonary EMC include mucoepidermoid carcinoma, adenoid cystic carcinoma, pleomorphic adenoma and so on. There is a possibility of misdiagnosis in small specimens. EMC of the lung is regarded as a low-grade malignant neoplasm. For diagnosis of EMC, it is necessary to obtain large specimen and/or resect by operation. In this paper, we report a completely resected case of primary peripheral EMC. It is thought that a biological characteristic of EMC will be elucidated by the further accumulation of EMC case.
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P2.03 - Chemotherapy/Targeted Therapy (ID 704)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Chemotherapy/Targeted Therapy
- Presentations: 1
- Moderators:
- Coordinates: 10/17/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)
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P2.03-019 - Sizing Capillary Electrophoresis with PCR to Detect Various EGFR Exon 19 Deletions in Non-Small Cell Lung Cancer (ID 8614)
09:30 - 09:30 | Presenting Author(s): Eiji Nakajima
- Abstract
Background:
This study points out an issue of PCR-based methods to detect exon 19 deletions. PCR methods are used for clinical examination, because they are useful, rapid and cost-effective to detect EGFR mutations. Exon 19 deletions are most important among EGFR mutations to dictate EGFR tyrosine kinase inhibitors (EGFR-TKIs) therapy in non-small cell lung cancer (NSCLC), and have various species. The sensitive PCR methods select major exon 19 deletions, but cannot detect unusual variants. We investigated the clinical significance of minority exon 19 deletions.
Method:
A series of 73 NSCLC patients, which were treated with EGFR-TKI for recurrent disease after they had undergone surgery from 1992 to 2004. In all cases, Microdissenction and direct sequence were performed. Scorpion Amplification Refractory Mutation System (ARMS) and cobas version 2.0, as sensitive PCR methods, were performed in 47 patients along with sizing capillary electrophoresis for the exhaustive detection of exon 19 deletions.
Result:
EGFR mutations were detected from 35 patients (47.9%), which were one exon 18 mutation, 23 exon 19 deletions, and 11 exon 21 mutations in all 73 cases. The catalog of somatic mutation in cancer (COSMIC) database included 174 different exon 19 deletions in 4190 submitted cases at December 2014. E746_A750 deletion was most common deletion of exon 19, accounting for 70% of the total exon 19 deletions (2931/4190). Predicted frequency of exon 19 tested by Scorpion-ARMS was 81.6% (3419/4190), and that of cobas version 2.0 had 82.5% (3457/4190) in the detection of various exon 19 deletions. In clinical samples of this study, Scorpion-ARMS and cobas version 2.0 failed to detect four exon 19 deletions, in two squamous cell carcinomas (EGFR-TKI effects were stable disease and no assessable patient) and two papillary adenocarcinomas (EGFR-TKI effects were stable disease and no assessable patient). One of papillary adenocarcinoma had minority deletion ‘T751_I759 deletion and insertion S’, which had long stable disease for 43.4 months in EGFR-TKI therapy. Sizing capillary electrophoresis was able to detect this deletion.
Conclusion:
This study suggests sizing capillary electrophoresis is necessary for the exhaustive detection of exon 19 deletions, and may identify tumors responsive to EGFR-TKIs therapy, especially those with unusual deletions.
