|Year : 2018 | Volume
| Issue : 6 | Page : 247-251
The clinical outcome of brain metastases in nonsmall cell lung cancer patients with epidermal growth factor receptor mutation- A retrospective single-institution analysis
Cho-Hao Lee1, Tzu-Chuan Huang1, Yung-Chih Wang2, Yi-Ying Wu1, Ching-Liang Ho1, Jia-Hong Chen3
1 Department of Medicine, Division of Hematology-Oncology, National Defense Medical Center, Tri-Service General Hospital, Taipei, Taiwan
2 Department of Internal Medicine, Division of Infectious Diseases and Tropical Medicine, National Defense Medical Center, Tri-Service General Hospital; Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan
3 Department of Medicine, Division of Hematology-Oncology, National Defense Medical Center, Tri-Service General Hospital; Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
|Date of Submission||09-Apr-2018|
|Date of Decision||25-Jun-2018|
|Date of Acceptance||30-Jul-2018|
|Date of Web Publication||22-Oct-2018|
Dr. Jia-Hong Chen
Department of Medicine, Division of Hematology-Oncology, National Defense Medical Center, Tri-Service General Hospital, No 325, Section 2, Cheng-Kung Road, Neihu 114, Taipei
Source of Support: None, Conflict of Interest: None
Introduction: Nonsmall cell lung cancer (NSCLC) is the leading cause of cancer-related deaths in many countries. Brain metastases (BM) from NSCLC are poor prognosis, with a median survival of 6 months following whole-brain radiotherapy. NSCLC patients harboring activating epidermal growth factor receptor (EGFR) mutations have generally responded to afatinib with good objective response rate, progression-free survival (PFS), and overall survival (OS), and platinum-double chemotherapy. These findings demonstrate the potential effectiveness of afatinib for the treatment of EGFR-positive with BM. The aim of this retrospective study is to present data on the prognostic effect of afatinib versus gefitinib in an unselected population with newly diagnosed NSCLC with BM collected. Patients and Methods: Data were obtained from our electronic database from 48 patients with newly diagnosed EGFR mutative NSCLC with BM and treated from January 2007 to December 2017, in which data on EGFR mutation was all available at the time of diagnosis. Results: Thirteen of forty-eight were treated with afatinib, and the other was treated with gefitinib. There were seven Exon 19 deletion and six were Exon 21 mutation ([p.Leu858Arg, (c.2573T>G)]:4; [p.Leu861Gln, (c.2582T>A)]:2). There was 18 Exon 19 deletion, and 16 were Exon 21 mutation ([p.Leu858Arg, (c.2573T>G)]:16) and the other one was Exon 18 mutation [p.Gly719Ser (c.2155G>A)]. There was no significant difference between two groups included PFS (afatinib: 12.0 months vs. gefitinib: 10.1 months, P = 0.766) and OS (afatinib: 20.6 months vs. gefitinib: 14.5 months, P = 0.362). Conclusion: From the K–M survival curve evaluation, neither the PFS nor OS have the statistical significance between gefitinib and afatinib. We provided a real-world data to compare the efficacy of EGFR-TKI in NSCLC. Due to relative small sample size, we urged large clinical trial to provide more precise results.
Keywords: Brain metastases, nonsmall cell lung cancer, epidermal growth factor receptor mutation
|How to cite this article:|
Lee CH, Huang TC, Wang YC, Wu YY, Ho CL, Chen JH. The clinical outcome of brain metastases in nonsmall cell lung cancer patients with epidermal growth factor receptor mutation- A retrospective single-institution analysis. J Med Sci 2018;38:247-51
|How to cite this URL:|
Lee CH, Huang TC, Wang YC, Wu YY, Ho CL, Chen JH. The clinical outcome of brain metastases in nonsmall cell lung cancer patients with epidermal growth factor receptor mutation- A retrospective single-institution analysis. J Med Sci [serial online] 2018 [cited 2019 Jun 27];38:247-51. Available from: http://www.jmedscindmc.com/text.asp?2018/38/6/247/240909
| Introduction|| |
Lung cancer is the leading cause of cancer death and the second most common cancer among both men and women in Taiwan as well as in the United States. Nonsmall cell lung cancer (NSCLC) is the leading cause of cancer-related deaths in many countries. Brain metastases (BM) from NSCLC are poor prognosis, with a median survival of 6 months following whole-brain radiotherapy (RT). NSCLC patients harboring activating epidermal growth factor receptor (EGFR) mutations have generally responded to afatinib with good objective response rate (ORR), progression-free survival (PFS), overall survival (OS), and platinum-double chemotherapy. A recent analysis of 81 patients with BM from LUX-Lung 3 and 6 revealed a median PFS of 8.2 or 5.4 months. These findings demonstrate the potential effectiveness of Giotrif for the treatment of EGFR-positive with BM. However, the central nervous system (CNS) is a common site of recurrence, probably owing to the low penetration of agents into the CNS. Cerebrospinal fluid (CSF) concentration of gefitinib was poor, with a CSF penetration rate of 1.2%. CSF concentration of erlotinib is better than gefitinib, with penetration rate of erlotinib was 2.7%–4.4%. Afatinib penetrates blood–brain barrier in NSCLC BM mice and contributes to the brain tumor response. The results support for the potential application of Giotrif in NSCLC patients with BM. The median CSF penetration rate (1.7%) of afatinib in this study by Akihiro Tamiya was higher than that reported previously (0.7%)., The aim of this retrospective study is to present data on the prognostic effect of afatinib versus gefitinib in an unselected population with newly diagnosed NSCLC with BM collected.
| Patients and Methods|| |
Study population and diagnosis of cancer
Inclusion criteria include that we searched the electronic database of our hospital for patients with newly diagnosed EGFR mutative NSCLC with BM and treated from January 2007 to December 2017. The study comprised a retrospective cohort of patients and was approved by the Institutional Review Board (IRB) of Tri-Service General Hospital. NSCLC was confirmed by clinical, radiological, and pathological features in all cases. The stage procedure included a comprehensive laboratory panel, bronchoscopy, the chest and abdominal computed tomography (CT), magnetic resonance imaging (MRI), or CT of the brain and bone scan. Patient characteristics and laboratory data were collected at initial diagnosis including demographic features (gender and age), accompanying medical history (hypertension and diabetes), smoking history, serum laboratory data, and survival time. The demographic features, medical, and smoking histories were evaluated by review of the medical records. The OS was defined as the time from the date of diagnosis to the date of death. The duration of PFS was defined as the time interval between the day of diagnosis and the day of locoregional recurrence or distant metastasis. Disease progressions are diagnosed by computed tomography or MRI. Death was also taken as disease progression. However, exclusion criteria contained the EGFR mutative NSCLC patients with recurrent BM later and the NSCLC patients using target therapy in the past.
This study was performed under the guidelines of the Helsinki Declaration and approved by the IRB of Tri-Service General Hospital.
Treatment of cancer
First-line therapy was performed with tyrosine kinase inhibitors (TKI) agent for all enrolled patients.,,, Afatinib was dosed at 40 mg per day, and gefitinib was dosed at 100 mg per day. The cranial irradiation was also administered with 30 Gy divided into 10 fractions.,
Measurement of covariates and statistical assessment
The differences in study variables between treatment with afatinib and gefitinib were tested using Chi-square test where appropriate. For compared with survival status in treatment with afatinib and gefitinib, Kaplan–Meier curve, and log-rank test were used to test their difference. We considered a P < 0.05 as statistically significant for all analyses. The survival time was defined as the time from the time of diagnosis to the date of death. Statistical analyses were carried out with R 3.0.1 software (R Foundation for Statistical Computing, Vienna, Austria, http://www.R-project.org/) and “survival” package.
| Results|| |
Forty-eight patients with newly diagnosed EGFR mutative NSCLC with BM were identified. The results of EGRF mutation data were available in all patients. Thirteen of forty-eight were treated with afatinib, and the other was treated with gefitinib. There were seven Exon 19 deletion and six were Exon 21 mutation ([p. Leu858Arg, (c.2573T>G)]:4; [p. Leu861Gln, (c.2582T>A)]:2) in the afatinib group. There was 18 Exon 19 deletion, and 16 were Exon 21 mutation ([p. Leu858Arg, (c.2573T>G)]:16) and the other one was Exon 18 mutation [p. Gly719Ser (c.2155G>A)] in the gefitinib group. The difference of EGFR between treatment with afatinib and gefitinib was not statistically significant [P = 0.815, [Table 1].
|Table 1: Patient characteristics and data collected at initial diagnosis|
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The median age of the patient with afatinib was 65.38 years, and the male-to-female ratio was 0.625; median age of the patient with gefitinib was 63.89 years, and the male-to-female ratio was 0.75. Patient characteristics and data are shown in [Table 1]. Distribution of age and gender did not differ significantly in the two study groups; however, the distribution of the tumor location differ statistically significant in the two study groups (P = 0.029).
The prognosis of treatment with afatinib was compared with that of gefitinib. The Kaplan–Meier curves and results of the log-rank tests are shown in [Figure 1]a and [Figure 1]b, and the difference of PFS between treatment with afatinib and gefitinib was not statistically significant (12.0 vs. 10.1 months, P of log-rank test = 0.766); the difference of OS between treatment with afatinib and gefitinib was not statistically significant (20.6 vs. 14.5 months, P of log-rank test = 0.362).
|Figure 1: Kaplan-Meier survival plot of Giotrif and Iressa (a) progression free survival (b) overall survival|
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| Discussion|| |
Lung cancer is the leading cause of cancer mortality worldwide and is representing 18.2% of total deaths from cancer. Among those, nearly 7.4% of NSCLC patients will have BM at appearance, and 25%–30% will develop BM during their disease. Life expectancy for these patients is poor, with a median survival of only 3.4 months. Besides, numerous will suffer considerable loss of autonomy due to neurocognitive and functional deficits, as well as morbidity.,
The use of drugs targeting the proteins of mutated EGFR has become standard of care in the systemic treatment of metastatic NSCLC. In addition, large international Phase III trials comparing EGFR TKI against platinum-doublet chemotherapy have achieved significant PFS benefits of >4 months with hazard ratios (HRs) ranging from 0.37 to 0.58 and improvements to symptoms and quality of life.,,,
In first-line clinical trials of the EGFR-targeted drugs gefitinib, erlotinib, and afatinib, ORR of 55%–83% were observed, mostly clustering above 70%. Our study has shown a trend that the PFS (12.0 vs. 10.1 months) and OS (20.6 vs. 14.5 months) effects of the first line of afatinib may be better than gefitinib in EGFR mutative NSCLC with BM. However, the sample size was small, and there was no significant difference between the two groups. The present study showed that there was no statistical difference in the median PFS (11.3 vs. 10.8 months, P = 0.2030) and OS (13.8 vs. 13.5 months, P = 0.3185) between the gefitinib and the erlotinib groups.
Since there are more effective molecular-targeted agents in the treatment for some subsets of NSCLC compared to the conventional therapy, increasing attention has been paid to the potential role of EGFR-TKI in BM from NSCLC in recent years. Nonetheless, BM was usually considered as exclusion criteria in most previous clinical studies involving EGFR-TKI and accounts of its use in intracranial lesions are available only in a few case reports or some small studies with limited number of patients. Therefore, the role of EGFR-TKI in this setting remains unclear. The purpose of this retrospective study was to further explore the antitumor efficacy of EGFR-TKI therapy against BM from NSCLC harboring EGFR mutation.
The median PFS was 12.0 months in afatinib or 10.1 months in gefitinib in the present study was better than others (the median PFS of 11.1 months in afatinib or 5.4 months in chemotherapy form LUX-Lung 3 and the median PFS of 8.2 months in afatinib or 4.7 months in chemotherapy form LUX-Lung 6 LUX-Lung 6). However, the prognostic factors have been identified, which can be patient or disease related; the patient-related factors include age and performance status (ECOG, neurological findings, estimated prognosis, comorbidities, and patient preferences) and disease-related factors include primary tumor type, and chemosensitivity, systemic disease burden, and single versus multiple BM.
New outcome again demonstrated the advantage of frontline osimertinib in patients with EGFR-positive advanced NSCLC and CNS metastases at baseline, according to data presented at the 2017 ESMO Asia Congress. The subgroup analysis from the Phase III FLAURA trial included 128 patients with at least one measurable and/or nonmeasurable CNS lesion at baseline. Among 61 patients who received osimertinib, the CNS ORR was 66%, compared to 43% (odds ratio, 2.5; 95% CI 1.2–5.2; P = 0.011) in 67 patients who received standard EGFR TKI therapy with erlotinib or gefitinib. Osimertinib reduced the risk of CNS disease progression or death by 52% (HR, 0.48; 95% CI, 0.26–0.86; nominal P = 0.014). The rate of disease progression resulting from the development of new CNS lesions was also lower with osimertinib, at 12% versus 30%. In October 2017, the FDA awarded a breakthrough therapy designation to osimertinib for the first-line treatment of patients with metastatic EGFR mutation-positive NSCLC. The drug is approved as a treatment for patients with metastatic EGFR T790M mutation-positive NSCLC following prior treatment with an EGFR TKI. Thus, our study did not include the treatment of osimertinib.,
However, there were still some limitations inherent in our study. First, due to the retrospective study, design and small sample size, heterogeneity of patients, and the prognostic effect of TKI agents in EGFR mutative NSCLC patients with BM need to be confirmed by large, prospective cohort studies. Second, there were few patients who received afatinib for fewer months in our analysis. The duration of follow-up was too short to evaluate the survival benefit of treatment. Third, a disease progression of BM in NSCLC was noted after TKI, and rebiopsy form CNS tissue was difficult in our study.
| Conclusion|| |
Our results quantify the relationships more precisely than previously. From the K–M survival curve evaluation, neither the PFS nor OS have the statistical significance between gefitinib and afatinib. We provided a real-world data to compare the efficacy of EGFR-TKI in NSCLC. Due to relative small sample size, we urged large clinical trial to provide more precise results.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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