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General Thoracic and Cardiovascular Surgery

, Volume 62, Issue 6, pp 351–356 | Cite as

Treatment options for patients with large cell neuroendocrine carcinoma of the lung

  • Akira Iyoda
  • Takashi Makino
  • Satoshi Koezuka
  • Hajime Otsuka
  • Yoshinobu Hata
Open Access
Current Topics Review Article

Abstract

Large cell neuroendocrine carcinoma (LCNEC) of the lung is categorized as a variant of large cell carcinomas, and LCNEC tumors display biological behaviors resembling those of small cell lung carcinomas and features of high-grade neuroendocrine tumors. Because patients with LCNEC have a poor prognosis, surgery alone is not sufficient. Multimodality therapies, including adjuvant chemotherapy, appear promising for improved prognosis in patients with LCNEC. In this review article, we discuss treatment options for patients with LCNEC of the lung.

Keywords

Large cell neuroendocrine carcinoma Lung Treatment 

Introduction

In 1980, pulmonary neuroendocrine tumors were categorized as typical carcinoids, atypical carcinoids, or small cell lung carcinoma (SCLC) [1]. Travis et al. [2] proposed that large cell neuroendocrine carcinoma (LCNEC) should constitute a new category and reported that the prognosis of LCNEC falls between those of atypical carcinoids and SCLC. The World Health Organization [3] categorized LCNEC as non-SCLC (NSCLC). Currently, LCNEC is classified as a variant of large cell carcinomas; however, the clinical and biological characteristics of LCNEC are similar to those of SCLC. Therefore, there is still no consensus on the treatment strategy for LCNEC [4]. In this review article, we focus on treatment strategies for patients with LCNEC.

Biological features of LCNEC

Several reports [5, 6, 7] revealed that the clinical behavior, morphology, and prognosis of LCNEC were similar to those of SCLC, even though there might be several clinicopathological differences between SCLC and LCNEC in peripheral, small-sized, high-grade neuroendocrine tumors [8]. Although Varlotto et al. [9] obtained and evaluated data on LCNEC from the Surveillance, Epidemiology, and End Results Program to show that the clinical, histopathologic, and biologic features of LCNEC were more similar to those of large cell carcinoma than SCLC, a central pathological review by an expert panel was necessary to confirm the diagnosis, a requisite lacking in the report by Varlotto et al. [10, 11]. Cytomorphologically, LCNEC shows characteristic arrangements, such as palisading or rosettes with necrosis [12]. Morphometric analysis revealed significantly different features between LCNEC and classic large cell carcinomas. Iyoda et al. [13] showed that LCNEC had significantly higher expression rates of Bcl-2 and the Ki-67 labeling index than did classic large cell carcinoma. These results revealed that the cytological and biological features of LCNEC were different from those of classic large cell carcinoma. Jones et al. [14] examined the gene expression profiles of LCNEC, SCLC, adenocarcinoma, and normal lung using microarray analysis, which was unable to distinguish LCNEC from SCLC. Using the telomeric repeat amplification protocol assay, Zaffaroni et al. [15] reported that almost all LCNEC tumors showed telomerase activity comparable to that of SCLC.

On the other hand, Nitadori et al. [16] indicated that the expression of CK7, CK18, E-cadherin, and β-catenin is more characteristic of LCNEC than of SCLC, suggesting that LCNEC and SCLC are separate entities. Ullmann et al. [17] examined comparative genomic hybridization (CGH) for LCNEC and SCLC and showed that there were differences between the two in the expression from chromosomal regions 3q, 6p, 10q, 16q, and 17p. Peng et al. [18] evaluated array-based CGH for LCNEC and SCLC and reported differences in expression at 2q, 3p, 4q, and 6p, even though LCNEC and SCLC had multiple characteristic chromosomal alterations in common. Hiroshima et al. [19] examined loss of heterozygosity (LOH) in microsatellite markers and methylation of the p16 gene in LCNEC, SCLC, and classic large cell carcinoma, and they reported that the LOH patterns of LCNEC resembled those of SCLC, even though LCNEC was also similar to classic large cell carcinoma with regard to p16 gene methylation. While many clinicopathological features of LCNEC were similar to those of SCLC, some of the biological behaviors of LCNEC differed from those of SCLC.

Surgery for patients with LCNEC

Because most LCNECs have been diagnosed postoperatively by surgical specimens, many reports on LCNEC have referred to surgical cases, of which the majority [6, 20, 21, 22, 23, 24, 25, 26, 27] revealed that patients with LCNEC had poor prognoses with five-year survival rates of 15–57 %. Moreover, even patients with pathological stage I LCNEC have had poor prognoses, with five-year survival rates of 27–67 % [22, 23, 24, 25, 26]. Iyoda et al. [28] compared the prognoses of LCNEC patients with pathological stage IA with those of patients with adenocarcinomas or squamous cell carcinomas of the same stage, and they revealed that the five-year survival rate of the LCNEC patients was 54.5 versus 89.3 % for the adenocarcinoma or squamous cell carcinoma patients. In LCNEC patients with complete resection, many recurrent tumors were observed as distant metastases [29, 30]. Therefore, surgery alone is not sufficient to treat patients with LCNEC, and subsequent adjuvant therapy may be necessary [4, 31, 32]. In 2001, Iyoda et al. [33] reported that postoperative adjuvant chemotherapy was effective in patients with LCNEC. Veronesi et al. [23] reported that 12 of 15 LCNEC cases administered induction chemotherapy were responsive (a partial response in 11 patients, a complete response in one patient) and that stage I LCNEC patients with induction or adjuvant chemotherapy tended to have a better survival than those without such therapies (p = 0.077). In 2005, in a retrospective study by Rossi et al. [25] adjuvant chemotherapy with CDDP+VP-16 was reported to be effective for patients with LCNEC. Iyoda et al. [34] started a prospective study of adjuvant chemotherapy in patients with LCNEC in 2000, and they selected CDDP+VP-16 as the chemotherapeutic regimen because the clinicopathologic and biological features of LCNEC are very similar to those of SCLC. They reported in 2006 that patients with adjuvant chemotherapy after complete surgical resection had a good prognosis compared with the historical control group.

Sarkaria et al. [35] reported that LCNEC had a high response rate to platinum-based neoadjuvant chemotherapy, and that resected advanced-stage patients receiving combination neoadjuvant and/or adjuvant chemotherapy may have a survival advantage. They suggested that these therapies should be considered in resectable patients with LCNEC.

Recently, many studies have reported that perioperative chemotherapy may be beneficial in patients with resected LCNEC [32, 36, 37]. Tanaka et al. [38] performed a unique study and suggested that perioperative chemotherapy might benefit the survival of patients with LCNEC if the tumors are not immunoreactive to the three neuroendocrine markers evaluated.

Which agents are better for treatment of LCNEC patients: SCLC-based versus non-SCLC-based regimens?

When using chemotherapy, we have to consider whether to use SCLC-based or non-SCLC-based regimens for LCNEC patients, since LCNEC is currently classified as non-SCLC, even though the clinical and biological characteristics of LCNEC are similar to those of SCLC.

Sun et al. [39] revealed that the response rate to platinum-based chemotherapy was 60 %, whereas the response rate to non-platinum-based chemotherapy was 11 %. Moreover, they examined whether advanced LCNEC should be treated similarly to SCLC versus non-SCLC with respect to chemotherapeutic regimens, and they concluded that advanced LCNEC could be treated appropriately in a manner similar to SCLC rather than NSCLC. Igawa et al. [40] reported that the effectiveness of chemotherapy for unresectable LCNEC was comparable to that for extended disease SCLC. Tokito et al. [41] reported that the response rate for SCLC-based chemotherapy was 70 % in patients with LCNEC. Shimada et al. [42] suggested that the overall response rate to initial chemotherapy or chemoradiotherapy and the survival outcomes of high-grade neuroendocrine carcinoma-probable LCNEC were comparable to those of SCLC, even though the efficacy of second-line chemotherapy might differ between LCNEC and SCLC. Yamazaki et al. [43] reported that the response rate of LCNEC to cisplatin-based chemotherapy was comparable with that of SCLC.

Surgical indication for patients with LCNEC

Treut et al. [44] performed a multicenter phase II study of cisplatin–etoposide chemotherapy for stage IIIB or IV LCNEC patients, and they concluded that the outcome of advanced LCNEC patients treated with cisplatin–etoposide doublet chemotherapy was poor, comparable with that of patients with advanced SCLC, with an 8-month median overall survival. Their study revealed that the multi-institutional trials on LCNEC, especially on treatments such as chemotherapy, were necessary to have the centralized pathologist review because their study reclassified 11 (27.5 %) of 40 LCNEC patients into 9 as SCLC, 1 as undifferentiated non-SCLC, and 1 as atypical carcinoid. These difficulties may also affect the result of clinical trials using adjuvant chemotherapy for LCNEC patients. Niho et al. [45] performed combination chemotherapy with irinotecan and cisplatin in patients with advanced LCNEC and revealed that the response rate was 46.7 % in the LCNEC group. They concluded that combination chemotherapy with irinotecan and cisplatin was an active regimen in patients with LCNEC, although the response rate and the overall survival period in LCNEC patients were inferior to those of SCLC patients. Patients with advanced-stage LCNEC had a poor prognosis because they could not always achieve a complete response. Although there were high response rates for platinum-based and SCLC-based chemotherapies, almost all patients had only partial responses. Patients with LCNEC may not be able to expect complete responses with platinum-based and SCLC-based chemotherapies compared with SCLC patients, even though these chemotherapies are as effective as adjuvant treatment after removing tumors.

The indication for surgery is limited to stage I in patients with SCLC, however, surgery with adjuvant chemotherapy may achieve satisfactory results in terms of survival in regard to surgical indications for patients with not only stage I but also stage II/III in LCNEC [46]. Iyoda et al. [29] reported that platinum-based adjuvant chemotherapy after surgery might be useful for preventing recurrence in patients with LCNEC. Therefore, surgical indications for patients with LCNEC may not be limited to clinical stage I cases, and surgery with adjuvant chemotherapy should be attempted for resectable LCNEC.

New treatments for LCNEC

Many reports revealed that platinum-based and SCLC-based chemotherapies were effective for patients with LCNEC. However, those results were not enough to improve the prognoses of patients with LCNEC, especially those with advanced stages. Therefore, we need to discover new treatments for patients with LCNEC.

As for new chemotherapeutic agents, Kenmotsu et al. [47] reported that nedaplatin plus irinotecan was effective and safe for patients with LCNEC. Yoshida et al. [48] studied the effectiveness of amrubicin monotherapy in patients with previously treated advanced LCNEC, for whom they showed that amrubicin was potentially active, yielding an objective response rate of 27.7 %.

With molecular targeted therapies, De Pas et al. [49] reported a case of LCNEC with EGFR mutation, which had a dramatic response to gefitinib. Kozuki et al. [32] also reported a case with a partial response to gefitinib. Other authors [50, 51, 52] reported cases of LCNEC with EGFR mutation, but only a few [51, 53]. Even though few patients have EGFR mutations, EGFR-TKI may be an optimal treatment for certain patients with LCNEC. Filosso et al. [54] concluded that octreotide, which is used for the treatment of carcinoid syndrome, was effective for patients with LCNEC.

In experimental studies, Odate et al. [55] found that the expression of tropomyosin-related kinase B and brain-derived neurotrophic factor was significantly higher in LCNEC than in SCLC, and they proposed that these two genes might be potential targets in LCNEC. Iyoda et al. [53] examined new markers for patients with LCNEC, and they suggested a potential role for anti-VEGF, anti-c-KIT, and possibly anti-HER2-targeted agents in the treatment of LCNEC. Yokouchi et al. [56] reported successful treatment with intravitreal injection of bevacizumab in LCNEC patients with metastasis to the iris.

Treatments for patients with LCNEC originating from other organs

The first report of LCNEC was in the lung, and most reports have also referred to pulmonary LCNECs. However, we may be able to get important information regarding treatment options for lung LCNEC from studies on treatments for patients with LCNEC of other organs.

Kusafuka et al. [57] reported a trend toward recommending primary chemotherapy and radiation, rather than primary surgery with postoperative radiation/systemic therapy, for patients with LCNEC in the head and neck, based on the fact that LCNEC has extremely similar clinical features, patterns and timing of spread, and prognosis as those of small cell carcinomas, suggesting that treatment should also be similar. Ose et al. [58] reported a case of thymic LCNEC administered induction chemoradiation therapy (three cycles of cisplatin/etoposide and 45 Gy of hyperfractionated radiation) because of invasion to the aortic arch and pulmonary trunk. Pathologic examination revealed no viable cells in the resected tumor, and the patient was alive 3 years later without recurrence. Tangjitgamol et al. [59] reported a case of LCNEC of the uterine cervix with good response to primary chemotherapy of paclitaxel/carboplatin. Embry et al. [60] suggested that LCNEC of the cervix was more aggressive with a poorer prognosis than squamous cell carcinoma, and perioperative chemotherapy, platinum with or without etoposide, improved survival of patients with LCNEC of the cervix. Yoseph et al. [61] conducted a review of more than 70 cases with LCNEC of the uterine cervix and found that current multimodal strategies have been adapted mainly from treatments used for neuroendocrine carcinomas of the lung, even though no consensus had been reached as far as an optimal treatment plan because of the rarity of cervical LCNEC. Oberstein et al. [62] reported that gastric LCNEC is a high-grade tumor with an aggressive course, and that treatment with platinum-based chemotherapy might provide clinical benefits. Evans et al. [63] reported seven cases with prostate LCNEC, of which all six cases with complete follow-up died from widespread metastases, and five of these six cases were treated with platinum-based chemotherapy, with a mean survival of 7 months from the time of the last course. Shimono et al. [64] reported that multimodal treatment, including surgery, chemotherapy with cisplatin and etoposide, and radiation therapy, achieved a good response and long survival in a patient with LCNEC of the gallbladder.

Although we are beginning to understand the clinicopathological and biological features of patients with LCNEC little by little, there is no consensus on treatment in patients with lung LCNEC. We need large-scale trials in order to reach a consensus; however, in the near future, we may not be able to perform such trials because of the rarity of LCNEC cases. Therefore, we should continue trying to obtain useful information from several small-scale studies as well as to evaluate new strategies, including molecular targeted therapies, for patients with LCNEC.

Notes

Acknowledgments

This work was supported in part by a Grant-in-Aid for Scientific Research (C) 24592098 of the Japanese Ministry of Education, Culture, Sports, Science, and Technology.

Conflict of interest

We have no conflict of interest.

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© The Author(s) 2014

Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

Authors and Affiliations

  • Akira Iyoda
    • 1
  • Takashi Makino
    • 1
  • Satoshi Koezuka
    • 1
  • Hajime Otsuka
    • 1
  • Yoshinobu Hata
    • 1
  1. 1.Division of Chest Surgery, Department of Surgery, School of MedicineToho UniversityTokyoJapan

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