TY - JOUR
T1 - Anterior gradient 2 is correlated with EGFR mutation in lung adenocarcinoma tissues
AU - Narumi, Sodai
AU - Miki, Yasuhiro
AU - Hata, Shuko
AU - Ebina, Masahito
AU - Saito, Mikiyoshi
AU - Mori, Kazushige
AU - Kobayashi, Makoto
AU - Suzuki, Takashi
AU - Iwabuchi, Erina
AU - Sato, Ikuro
AU - Maemondo, Makoto
AU - Endo, Chiaki
AU - Inoue, Akira
AU - Kondo, Takashi
AU - Yamada-Okabe, Hisafumi
AU - Ichinose, Masakazu
AU - Sasano, Hironobu
N1 - Publisher Copyright:
© 2014 Wichtig Publishing.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - Background: Epidermal growth factor receptor (EGFR)–tyrosine kinase inhibitor (TKI) has demonstrated a promising therapeutic response in lung adenocarcinoma patients with EGFR gene mutations. However, the predictive factors for this therapy have not been established, except for the EGFR gene mutation status of carcinoma cells. Methods: We first performed microarray analysis in EGFR-TKI–sensitive lung adenocarcinoma cell lines. The results indicated anterior gradient 2 (AGR2) as a potential surrogate marker of EGFR-TKI. Therefore, we then evaluated the correlation between the status of AGR2 immunoreactivity and clinicopathological factors including overall survival (OS), progression-free survival (PFS) and clinical response to EGFR-TKI, in 147 cases of surgically resected lung adenocarcinoma. The biological significance of AGR2 was further evaluated by transfecting small interfering RNA (siRNA) against AGR2 in these cells. Results: The status of AGR2 immunoreactivity was significantly higher in lung adenocarcinoma cases with EGFR gene mutations than in those with the wild type (p<0.0001), but there were no significant differences in OS, PFS and response of EGFR-TKI between the AGR2 high and low carcinoma cases. Knockdown of AGR2 gene expression following siRNA transfection resulted in a significantly lower response to EGFR-TKI in EGFR-mutated PC-3. Conclusions: AGR2 could serve as an adjunctive surrogate protein marker possibly reflecting EGFR gene mutations in lung adenocarcinoma patients. Results from in vitro analysis indicated that AGR2 could be a potential clinical biomarker of EGFR-TKI therapeutic sensitivity in lung adenocarcinoma cells.
AB - Background: Epidermal growth factor receptor (EGFR)–tyrosine kinase inhibitor (TKI) has demonstrated a promising therapeutic response in lung adenocarcinoma patients with EGFR gene mutations. However, the predictive factors for this therapy have not been established, except for the EGFR gene mutation status of carcinoma cells. Methods: We first performed microarray analysis in EGFR-TKI–sensitive lung adenocarcinoma cell lines. The results indicated anterior gradient 2 (AGR2) as a potential surrogate marker of EGFR-TKI. Therefore, we then evaluated the correlation between the status of AGR2 immunoreactivity and clinicopathological factors including overall survival (OS), progression-free survival (PFS) and clinical response to EGFR-TKI, in 147 cases of surgically resected lung adenocarcinoma. The biological significance of AGR2 was further evaluated by transfecting small interfering RNA (siRNA) against AGR2 in these cells. Results: The status of AGR2 immunoreactivity was significantly higher in lung adenocarcinoma cases with EGFR gene mutations than in those with the wild type (p<0.0001), but there were no significant differences in OS, PFS and response of EGFR-TKI between the AGR2 high and low carcinoma cases. Knockdown of AGR2 gene expression following siRNA transfection resulted in a significantly lower response to EGFR-TKI in EGFR-mutated PC-3. Conclusions: AGR2 could serve as an adjunctive surrogate protein marker possibly reflecting EGFR gene mutations in lung adenocarcinoma patients. Results from in vitro analysis indicated that AGR2 could be a potential clinical biomarker of EGFR-TKI therapeutic sensitivity in lung adenocarcinoma cells.
KW - AGR2 protein
KW - Adenocarcinoma
KW - EGFR tyrosine kinase inhibitor
KW - Epidermal growth factor receptor
KW - Immunohistochemistry
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U2 - 10.5301/jbm.5000131
DO - 10.5301/jbm.5000131
M3 - Article
C2 - 25634032
AN - SCOPUS:84934760002
VL - 30
SP - e234-e242
JO - International Journal of Biological Markers
JF - International Journal of Biological Markers
SN - 0393-6155
IS - 2
ER -