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Gastric endocrine cell carcinoma coexistent with adenocarcinoma.

1. Introduction

Gastric endocrine cell carcinoma (ECC), characterized by endocrine differentiation and aggressive biological behavior, is occasionally accompanied by the presence of adenocarcinoma cells. On the basis of the analysis of p53 gene alteration, the hypothesis that was derived proved that adenocarcinoma cells have the potential to develop into gastric ECC [1]. Here we present a case of gastric ECC coexistent with adenocarcinoma as well as p53 gene analyses of ECC and adenocarcinoma.

2. Case Presentation

A 69-year-old female presented to our institution with epigastralgia and abdominal distension. Her past medical history included hypertension and dyslipidemia. On physical examination, her cognitive consciousness was alert. Her height, weight, and body mass index were 144.2 cm, 53.3 kg, and 25.6 kg/[m.sup.2], respectively. Mild anemia was evident in her palpebral conjunctiva. Chest auscultation revealed no abnormal findings. The abdomen was soft and flat with normal bowel sounds. No lymph nodes were palpable, and no tumors were palpable on rectal examination. Blood chemistry analyses (Table 1) revealed mild anemia (red blood cell count, 347 x [10.sub.4]/[micro]L; hemoglobin levels, 9.9 mg/dL), mildly increased C-reactive protein levels (0.6 mg/dL), mildly increased brain natriuretic peptide levels (55.6 pg/mL), and evidence of coagulation dysfunction (prothrombin time, 79%; international normalized ratio, 1.19). The tumor markers serum carcinoembryonic antigen (0.8 ng/mL) and serum carbohydrate antigen 19-9 (3.4U/mL) were within normal limits. Chest radiography revealed cardiothoracic ratio of 51.4% without any evidence of pulmonary congestion or pleural effusion. Abdominal radiography revealed no abnormal gas distribution. Upper gastrointestinal series (Figure 1(a)) revealed a 5 cm ulcerative lesion with irregular margins and elevated distinct borders from the angle to the pyloric ring. Gastroendoscopy (Figure 1(b)) revealed a Borrmann type 2 tumor, extending from the angle to the antrum of the lesser curvature. The tumor comprised two different parts: ulcers with severe invasiveness and smooth protrusion from the endocrine cells (Figure 2(a)) and well-differentiated adenocarcinoma cells (Figure 2(b)) as exhibited by specimens biopsied under gastroendoscopy. ECC was confirmed by immunostaining examinations of cells, exhibiting positive results of chromogranin, synaptophysin, cytokeratin (CK) 7, and EMA (Figures 2(c)-2(f)). Other specimens revealed atypical cells forming glandular structures, leading to the diagnosis of well-differentiated tubular adenocarcinoma (tubl) (Figure 2(b)). Preoperative enhanced whole-body computed tomography (CT) revealed no distant metastases, signs of peritoneal dissemination, and regional lymph nodes swelling. Therefore, our gastric tumor was diagnosed as stage IIA tumor preoperatively. Subsequently, distal gastrectomy with D2 lymph node dissection and Billroth I reconstruction was performed. Pathological examination of the gross specimen (Figure 3(a)) revealed that adenocarcinoma cells comprised <10% of all cancer cells. Close analysis of ECC revealed a mixture of small and large cells, and 58% of Ki-67 labeling index (Figures 4(a)-4(c)). According to the WHO 2010 classification of gastrointestinal neuroendocrine tumors (NETs), ECC that coexists with adenocarcinoma (>30%) should be classified as "mixed adenoneuroendocrine carcinoma". However, adenocarcinoma comprised <10% of all cancer cells; therefore, this gastric tumor was classified as NEC.

Postoperatively, this gastric cancer was diagnosed as M, Type 2, 50 x 50 mm, NEC, pT4a, INFa, ly(+), v(-), pN1 (4/38) of Stage IIIB. Immunostaining of endocrine and adenocarcinoma cells with p53 antibody revealed positive results for both components. Analysis indicated that transformation of pre-existing adenocarcinoma cells into endocrine cells is influenced by p53 gene alteration. In the present case, p53 gene sequences of exon 5-8, wherein most p53 gene mutations have been reported to occur, were analyzed, and transitional mutation (A to C) was identified in codon 179 of exon 5 in ECC (Figure 5). Although two types of cancers could develop separately, there might be the possibility that endocrine cells transformed from adenocarcinoma cells by p53 gene alteration.

Postoperative course was uneventful, and the patient was administered adjuvant chemotherapy with cisplatin and etoposide. One year following surgery, follow-up abdominal CT revealed multiple liver metastases. The patient received the best supportive care but eventually died 18 months after surgery.

3. Discussion

ECC composes highly atypical neoplastic endocrine cells and is a poor highly malignant cancer with rapid progression, early vessel invasion, early metastasis, and poor prognosis [2]. ECC is opposite of carcinoid, which is low atypical and low malignant. The clinical presentation of ECC is similar to that of adenocarcinoma except that it has a more biologically aggressive character. The mean survival time of ECC is 7 months [2]. Morphologically, most ECCs develop into Borrmann type 2 tumors; however, few predominantly develop into submucosal layers similar to carcinoid tumors and form ulcerated lesions along with severe invasion into submucosal layers, thereby exhibiting Borrmann type 3 tumors. ECC is usually treated using a combination of surgery and chemotherapy. Because the response rate of chemotherapy widely varies, no established regimen exists to date. ECC is treated using the treatment regimen for small cell lung carcinoma with cisplatin and etoposide, irinotecan, or paclitaxel [3,4]. The gastric cancer regimen, S-1 with cisplatin, is also reportedly effective [5].

ECC comprises either small or large or both types of cells. In addition, the prevalence of coexistence of ECC with adenocarcinoma can be as high as 72.7% [1]. ECC is considered to develop as follows: differentiated glandular cancer cells arise initially, followed by the emergence of neoplastic endocrine cells (with high proliferative ability) through the differentiation of glandular cancer cells, and subsequently, endocrine cancer cells rapidly proliferate from the deep gland to submucosal layers, thereby forming glandular endocrine cancer.

Gastric ECC usually arises under submucosal layers, coexisting with mucosal adenocarcinoma. Normal mucosa covers over ECC; therefore, ECC is usually diagnosed as differentiated adenocarcinoma by specimens biopsied under endoscopy. With regard to the growth of ECC, the following four types of pathways have been hypothesized: (i) ECCs arise from pre-existing adenocarcinomas; (ii) ECCs arise from pre-existing carcinoid tumors: (iii) ECCs arise from nonneoplastic multipotent stem cells; (iv) ECCs arise from nonneoplastic endocrine cells. Of these, most gastrointestinal ECCs are considered to follow the first pathway [6].

4. Conclusions

When biopsied specimens reveal proliferation of small nuclear cancer cells without glandular structure, immunostaining should be performed to confirm ECC. Moreover, ECC occasionally comprised various types of cancer cells; therefore, endoscopic morphology of gastric ECC may vary according to the proportion of endocrine cancer cells. In the present case, during adjuvant chemotherapy following R0 resection, multiple liver metastases developed. Thus, future studies must focus on the emergence of promising anticancer agents or chemotherapy protocols.

http://dx.doi.org/10.1155/2013/502451

References

[1] K. Nishikura, H. Watanabe, M. Iwafuchi, T. Fujiwara, K. Kojima, and Y. Ajioka, "Carcinogenesis of gastric endocrine cell carcinoma: analysis of histopathology and p53 gene alteration," Gastric Cancer, vol. 6, no. 4, pp. 203-209, 2003.

[2] K. Matsui, M. Kitagawa, A. Miwa, Y. Kuroda, and M. Tsuji, "Small cell carcinoma of the stomach: a clinicopathologic study of 17 cases," American Journal of Gastroenterology, vol. 86, no. 9, pp. 1167-1175, 1991.

[3] K. Hasegawa, M. Maruyama, I. Takashima et al., "A case of gastric endocrine cell carcinoma with neck lymph node metastasis resected after neoadjuvant chemotherapy," Gan to Kagaku Ryoho, vol. 31, no. 11, pp. 1935-1938, 2004.

[4] T. Ohnishi, S. Kinami, E. Morioka et al., "A case of gastric endocrine cell carcinoma that responded to chemotherapy with CPT-11+CDDP.," Gan to Kagaku Ryoho, vol. 39, pp. 2384-2386, 2012.

[5] R. Ohhinata, Y. Iwasaki, M. Ohashi et al., "A case of gastric endocrine cell carcinoma with liver metastases treated with S1/CDDP," Gan to Kagaku Ryoho, vol. 37, no. 12, pp. 2508-2510, 2010.

[6] M. Iwafuchi, T. Watanabe, H. Honma et al., "Comparison between Japanese classification and 2010 WHO classification of endocrine cell tumors of the digestive tract," Stomach and Intestine, vol. 48, pp. 941-955, 2013.

Nobuhiro Takeuchi (1), Nomura Yusuke (1), Tetsuo Maeda (1), and Kazuyoshi Naba (2)

(1) Department of Gastroenterology, Kawasaki Hospital, Kobe, Hyogo 652-0042, Japan

(2) Department of Laboratory Medicine, Kawasaki Hospital, Kobe, Hyogo 652-0042, Japan

Correspondence should be addressed to Nobuhiro Takeuchi; takeuchLnobuhiro@kawasaki-hospital-kobe.or.jp

Received 16 October 2013; Revised 20 November 2013; Accepted 4 December 2013

Academic Editor: Martin G. Mack

TABLE 1: Laboratory data on admission.

Hematology

  WBC                  5,700 /[micro]L
  RBC             347 x [10.sup.4]/[micro]L
  Hb                       9.9 g/dL
  Ht                        30.0%
  MCV                      86.5 fL
  MCH                       28.6pg
  MCHC                    33.1 g/dL
  PLT             37.0 x [10.sup.4]/[micro]L
Serology
  CRP                     0.6 mg/dL
Blood chemistry
  TP                       6.8 g/dL
  Alb                      4.0 g/dL
  T-Bil                   0.4 mg/dL
  [gamma]-GTP              16 IU/L
  ALP                      378 IU/L
  AST                      13 IU/L
  ALT                       14IU/L
  LDH                      186 IU/L
  CK                       71 IU/L
  BUN                     9.9 mg/dL
  Cr                      0.60 mg/dL
  Na                      139 mEq/L
  K                       4.0 mEq/L
  Cl                      104 mEq/L
  BNP                     55.6 pg/mL
Coagulation
  PT                         79%
  PT-INR                     1.19
  APTT                     29.7 sec
Sugar
  Glucose                 125 mg/dL
Tumor marker
  CEA                     0.8 ng/mL
  CA19-9                   3.4 U/mL
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Article Details
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Title Annotation:Case Report
Author:Takeuchi, Nobuhiro; Yusuke, Nomura; Maeda, Tetsuo; Naba, Kazuyoshi
Publication:Case Reports in Medicine
Article Type:Case study
Geographic Code:9JAPA
Date:Jan 1, 2014
Words:1513
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