Carcinogenesis, Teratogenesis & Mutagenesis ›› 2024, Vol. 36 ›› Issue (5): 365-372,383.doi: 10.3969/j.issn.1004-616x.2024.05.005

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Control of blood glucose on targeted therapy in EGFR-mutated lung adenocarcinoma

ZHANG Xintong1, GU Meng2, WANG Ziyu2, WEI Panjian2, WANG Jinghui2, TAN Jinjing2   

  1. 1. Department of Clinical Laboratory, Beijing Chest Hospital, Capital Medical University/Beijing Tuberculosis Thoracic Tumor Institute, Beijing 101149;
    2. Cancer Research Center, Beijing Chest Hospital, Capital Medical University/Beijing Tuberculosis Thoracic Tumor Institute, Beijing 101149, China
  • Received:2024-05-15 Revised:2024-09-11 Published:2024-10-15

Abstract: OBJECTIVE: To investigate the control of blood glucose factors on efficacy of targeted therapy in patients with epidermal growth factor receptor(EGFR)- mutated lung adenocarcinoma. METHODS: From 2018 to 2019,a total of 277 lung adenocarcinoma patients who received the targeted therapy at the Beijing Chest Hospital,Capital Medical University,were recruited for our study. The relationships among fasting blood glucose (FBG) levels,resistance to targeted therapy and progression-free survival were analyzed. In addition,a culture medium with different glucose concentrations was used to simulate the in vitro glucose environment,and the effects of glucose on the growth of lung adenocarcinoma cell line HCC827 and its derived resistant cell line AZDR were investigated using cell biology methods. According to the glucose content of the cell culture environment,and whether AZD drugs were added or not,four in vitro groups were set up:high glucose,ordinary,high glucose +AZD treatment,and ordinary +AZD treatment groups. Cell proliferation was assessed using colony staining and CCK-8 assays. Cell apoptosis was detected using flow cytometry. Changes in expression of apoptosis-related factors (caspase-3 and metabolism-related protein mTOR) were evaluated using Western blot. RNA sequencing was performed to analyze the gene expression changes in AZDR cells after acquiring resistance. RESULTS: Among patients who showed EGFR-TKI treatment resistance,in addition to the increase of FBG in patients with diabetes combined with lung cancer (37 patients),FBG in patients with simple lung adenocarcinoma (240 patients) also increased,and 17.4% of lung adenocarcinoma patients exceeded the upper limit of the standard range of FBG in healthy people (6.1 mmol/L). Survival analysis revealed that patients with FBG levels greater than 6.1 mmol/L experienced resistance to targeted therapy later,compared to patients with FBG levels in the range of 4.0-6.0 mmol/L (P<0.05). The cell culture study revealed that the resistant cell line AZDR exhibited slow growth in a high-glucose environment,while the parental cell line HCC827 was not affected. Compared to the parental cell line HCC827,the resistant cell line AZDR showed increased apoptosis rate (P<0.05),upregulation of apoptosis-related protein caspase-3 (P<0.05),increased expression of insulin receptor IGFBP7,IGFBP2,IGF1R,and IGF2R,decreased expression of glucose metabolism-related genes SLC16A2SLC2A13,and HK2,and upregulation of mTOR and HK1 in a high-glucose environment (P<0.05). CONCLUSION: Changes of blood glucose level in patients with lung adenocarcinoma may be an important factor affecting the prognosis and the progression of drug resistance. In vitro studies showed that hyperglycemic environment is not conducive to the survival of drug resistant tumor cell subpopulations,which may be caused by changes in the expression of insulin receptors and glucose metabolism genes. In the process of targeted therapy for lung adenocarcinoma,it may be necessary to dialectically control changes of blood glucose in patients.

Key words: lung adenocarcinoma, fasting blood glucose, targeted therapy, tyrosine kinase inhibitors, tumor resistance

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