Skip to content


  • Case report
  • Open Access
  • Open Peer Review

This article has Open Peer Review reports available.

How does Open Peer Review work?

A case of lung adenocarcinoma harboring EGFR mutation and EML4-ALKfusion gene

  • 1Email author,
  • 1,
  • 1,
  • 1,
  • 1,
  • 1,
  • 2,
  • 1 and
  • 1
BMC Cancer201212:558

Received: 27 March 2012

Accepted: 20 November 2012

Published: 26 November 2012



Lung cancer is the leading cause of cancer-related death worldwide. Epidermal growth factor receptor (EGFR) - tyrosine kinase inhibitor (TKI) is used for the patients with EGFR-mutant lung cancer. Recently, phase III studies in the patients with EGFR-mutant demonstrated that EGFR-TKI monotherapy improved progression-free survival compared with platinum-doublet chemotherapy. The echinoderm microtubule-associated protein-like 4 (EML4) - anaplastic lymphoma kinase (ALK) fusion oncogene represents one of the newest molecular targets in non-small cell lung cancer (NSCLC). Patients who harbor EML4-ALK fusions have been associated with a lack of EGFR or KRAS mutations.

Case presentation

We report a 39-year-old patient diagnosed as adenocarcinoma harboring EGFR mutation and EML4-ALK fusion gene. We treated this patient with erlotinib as the third line therapy, but no clinical benefit was obtained.


We experienced a rare case with EGFR mutation and EML4-ALK. Any clinical benefit using EGFR-TKI was not obtained in our case. The therapeutic choice for the patients with more than one driver mutations is unclear. We needs further understanding of the lung cancer molecular biology and the biomarker infomation.


  • Lung cancer
  • EGFR mutation
  • EML4-ALK
  • Erlotinib


Lung cancer is the leading cause of cancer-related death worldwide. Recent studies on personalized treatment by selecting patients who are likely to respond to a particular therapeutic agent may allow improved treatment efficacy. Patients with non-small cell lung cancer (NSCLC) harboring mutations in the epidermal growth factor receptor (EGFR) gene have dramatic response to the EGFR- tyrosine kinase inhibitor (EGFR-TKI) [1, 2]. In 2007, the fusion of the anaplastic lymphoma kinase (ALK) with the echinoderm microtubule-associated protein-like 4 (EML4) was identified in NSCLC. EML4-ALK fusion gene arise as a result of an inversion in chromosome 2 that juxtaposed the 5 end of the EML4 gene with the 3 end of the ALK gene. The frequency of the fusion gene is approximately 6.7% in NSCLC [3]. The clinical features of lung cancer that harbors EML4-ALK include light- or never-smokers, younger age, adenocarcinomas with acinar pattern or signet ring adenocarcinoma, and a lack of EGFR or KRAS mutations [4]. Patients who have both mutations are extremely rare.

Case presentation

A 39-year-old man who is a light-smoker was referred to our hospital in June 2009 because of an abnormal shadow in the left upper field on chest X-ray (Figure 1A). Physical examination revealed no significant abnormalities. Computed tomography (CT) of the chest revealed a 40 mm tumor in the left S1+2 with multiple lung and bone metastases (cT4N3M1b). We conducted trans-bronchial lung biopsy (TBLB). The pathological diagnosis of the TBLB specimen was acinar adenocarcinoma (Figure 2A). In immunohistochemistry (IHC) staining, transcription factor-1 protein was positive. Laboratory findings were within normal range, except for the carcinoembryonic antigen (CEA) level of 4.7 ng/mL (normal range, 0 to 4.3 ng/mL) in the serum. We made a diagnosis of lung adenocarcinoma and treated the patient with the first line chemotherapy including cisplatin (80 mg/m2) and docetaxel (60 mg/m2) every three weeks up to three cycles. However, no remarkable response was observed. Therefore, the second line chemotherapy was conducted by pemetrexed (PEM) (500 mg/m2) therapy. PEM therapy was effective, and fifteen courses of PEM were administered to the patient. Thereafter new bone metastatic lesions were appeared. The patient had progressive disease (PD). We conducted re-biopsy to the patient to check EGFR mutation analysis by cycleave polymerase chain reaction technique (cycleave-PCR). L858R point mutation (in which leucine at amino acid 858 is replaced by arginine) was detected in the tumor cell (Figure 3). Therefore we treated the patient with erlotinib (150mg) therapy once a day. However, he had disease progression after 30 days (Figure 1B, C). We conducted the second re-biopsy to examine whether the patient had ALK fusion gene. ALK fusion gene was detected by reverse transcription polymerase chain reaction (RT-PCR) method (Figure 4). Additionally, IHC assay using a mouse monoclonal antibody for ALK antibody (Novocastra, Clone 5A4) revealed positive staining (Figure 2B). ALK inhibitor could not be used to the patient because ALK inhibitor was not approved in Japan at that time. The patient was treated fourth line chemotherapy three cycles, the other metastases emerged in his liver, and performance status became 3, therefore, palliative care was administered to the patient in December 2011.
Figure 1
Figure 1

A. Chest radiography revealed a mass shadow in the left upper lung field. Figure 1 B, 1 C. Compared with the initial computed tomography (CT) of thorax (B) and the repeated CT at 30 days after erlotinib treatment (C).

Figure 2
Figure 2

Histology of the primary tumor: (A) well differentiated adenocarcinoma component with acinar pattern (HE ×200). (B) Immunohistochemical examination revealed that tumor cells were positive for monoclonal anti-ALK antibody (5A4) (×200).

Figure 3
Figure 3

EGFR-gene mutation (L858R point mutation) was showed positive by Cycleave-PCR method.

Figure 4
Figure 4

ALK fusion expression was showed positive by RT-PCR validation.


We experienced a rare case of the patient who had both EGFR mutation and EML4-ALK fusion gene. To the best of our knowledge, five patients with both mutations have been reported so far in the world [58]. Four patients received EGFR-TKI therapy (Table 1). Two cases showed good response [5, 6], whereas the other two cases did not [7]. We report the 5th case which also did not show good response. In general, the response rate to EGFR-TKI therapy in the patients with EGFR mutation is 70-80%, however, these 5 cases with both mutations tend to be less responsive. In the preclinical study, EML4-ALK positive NSCLC was not responsive to erlotinib therapy [9]. EGFR-TKI therapy showed no effects to the all 10 patients with EML4-ALK fusion gene [4], although, there were no patients harboring both EGFR mutation and EML4-ALK in these papers. Whereas, EML4-ALK positive patients had a longer progression free survival after PEM therapy compared with EGFR mutant patients [10].
Table 1

Patients characteristics and treatment outcomes by EGFR-TKI




Smoking history


EGFR mutation

EGFR-TKI response

ALK variant

Kuo YW, et al.





Exon19 deletion


Variant 1

Potat S, et al.





Exon19 deletion



Tiseo M, et al.





Exon19 deletion



Zhang X, et al.





Exon19 deletion


Variant 3b

Present case







Variant 3b


Ad: adenocarcinoma, Adsq: adeno-squamous carcinoma, CR: complete response.

PR: partial response, PD: progressive disease, NA: not evaluated.

In our case, the characteristics of the patient were young age, light-smoker and acinar pattern adenocaricinoma which showed similarity with the ones of EML4-ALK positive NSCLC. Additionally, PEM therapy showed a good response to our patient, whereas erlotinib therapy did not. In the cases with these both mutations, EML4-ALK gene may play a main role in the oncogenesis for some unknown reasons. Although ALK inhibitor was effective to EML4-ALK positive NSCLC [11], it was not on the market in Japan at that point. Further experience and the understanding of the lung cancer molecular biology are required for the better treatment of the cases with both EGFR mutation and EML4-ALK fusion gene.


We report a rare case of lung cancer harboring both EGFR mutation and EML4-ALK fusion gene. PEM therapy showed a good response to the patient, whereas erlotinib therapy did not. Oncologists should be aware of the possibility of the multiple mutations.


Written informed consent was obtained from the patient for publication of this case report and accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.



Epidermal growth factor receptor


Tyrosine kinase inhibitor


Echinoderm microtubule-associated protein-like 4


Anaplastic lymphoma kinase


Non-small cell lung cancer


Trans-bronchial lung biopsy


Computed tomography




Carcinoembryonic antigen




Progressive disease


Cycleave polymerase chain reaction technique


Reverse transcription polymerase chain reaction.


Authors’ Affiliations

Hirosaki University Graduate School of Medicine, Course of Medical Sciences, Cardiology, Respiratory Medicine and Nephrology, Hirosaki, Japan
Department of Diagnostic Pathology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan


  1. Mitsudomi T, Morita S, Yatabe Y, Negoro S, Okamoto I, Tsurutani J, Seto T, Satouchi M, Tada H, Hirashima T, et al: Gefitinib versus cisplatin plus docetaxel in patients with non-small-cell lung cancer harbouring mutations of the epidermal growth factor receptor (WJTOG3405): an open label, randomised phase 3 trial. Lancet Oncol. 2010, 11 (2): 121-128. 10.1016/S1470-2045(09)70364-X.View ArticlePubMedGoogle Scholar
  2. Maemondo M, Inoue A, Kobayashi K, Sugawara S, Oizumi S, Isobe H, Gemma A, Harada M, Yoshizawa H, Kinoshita I, et al: Gefitinib or chemotherapy for non-small-cell lung cancer with mutated EGFR. N Engl J Med. 2010, 362 (25): 2380-2388. 10.1056/NEJMoa0909530.View ArticlePubMedGoogle Scholar
  3. Soda M, Choi YL, Enomoto M, Takada S, Yamashita Y, Ishikawa S, Fujiwara S, Watanabe H, Kurashina K, Hatanaka H, et al: Identification of the transforming EML4-ALK fusion gene in non-small-cell lung cancer. Nature. 2007, 448 (7153): 561-566. 10.1038/nature05945.View ArticlePubMedGoogle Scholar
  4. Shaw AT, Yeap BY, Mino-Kenudson M, Digumarthy SR, Costa DB, Heist RS, Solomon B, Stubbs H, Admane S, McDermott U, et al: Clinical features and outcome of patients with non-small-cell lung cancer who harbor EML4-ALK. J Clin Oncol. 2009, 27 (26): 4247-4253. 10.1200/JCO.2009.22.6993.View ArticlePubMedPubMed CentralGoogle Scholar
  5. Kuo YW, Wu SG, Ho CC, Shih JY: Good response to gefitinib in lung adenocarcinoma harboring coexisting EML4-ALK fusion gene and EGFR mutation. J Thorac Oncol. 2010, 5 (12): 2039-2040. 10.1097/JTO.0b013e3181f43274.View ArticlePubMedGoogle Scholar
  6. Popat S, de Vieira Araújo A, Min T, Swansbury J, Dainton M, Wotherspoon A, Lim E, Nicholson AG, O’Brien ME: Lung adenocarcinoma with concurrent exon 19 EGFR mutation and ALK rearrangement responding to erlotinib. J Thorac Oncol. 2011, 6 (11): 1962-1963. 10.1097/JTO.0b013e31822eec5e.View ArticlePubMedGoogle Scholar
  7. Tiseo M, Gelsomino F, Boggiani D, Bortesi B, Bartolotti M, Bozzetti C, Sammarelli G, Thai E, Ardizzoni A: EGFR and EML4-ALK gene mutations in NSCLC: a case report of erlotinib-resistant patient with both concomitant mutations. Lung Cancer. 2011, 71 (2): 241-243. 10.1016/j.lungcan.2010.11.014.View ArticlePubMedGoogle Scholar
  8. Zhang X, Zhang S, Yang X, Yang J, Zhou Q, Yin L, An S, Lin J, Chen S, Xie Z, et al: Fusion of EML4 and ALK is associated with development of lung adenocarcinomas lacking EGFR and KRAS mutations and is correlated with ALK expression. Mol Cancer. 2010, 9: 188-10.1186/1476-4598-9-188.View ArticlePubMedPubMed CentralGoogle Scholar
  9. Koivunen JP, Mermel C, Zejnullahu K, Murphy C, Lifshits E, Holmes AJ, Choi HG, Kim J, Chiang D, Thomas R, et al: EML4-ALK fusion gene and efficacy of an ALK kinase inhibitor in lung cancer. Clin Cancer Res. 2008, 14 (13): 4275-4283. 10.1158/1078-0432.CCR-08-0168.View ArticlePubMedPubMed CentralGoogle Scholar
  10. Camidge DR, Kono SA, Lu X, Okuyama S, Baron AE, Oton AB, Davies AM, Varella-Garcia M, Franklin W, Doebele RC: Anaplastic lymphoma kinase gene rearrangements in non-small cell lung cancer are associated with prolonged progression-free survival on pemetrexed. J Thorac Oncol. 2011, 6 (4): 774-780. 10.1097/JTO.0b013e31820cf053.View ArticlePubMedPubMed CentralGoogle Scholar
  11. Kwak EL, Bang YJ, Camidge DR, Shaw AT, Solomon B, Maki RG, Ou SH, Dezube BJ, Janne PA, Costa DB, et al: Anaplastic lymphoma kinase inhibition in non-small-cell lung cancer. N Engl J Med. 2010, 363 (18): 1693-1703. 10.1056/NEJMoa1006448.View ArticlePubMedPubMed CentralGoogle Scholar
  12. Pre-publication history

    1. The pre-publication history for this paper can be accessed here:


© Tanaka et al.; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.