BACKGROUND The emergence of secondary drug resistance when treating epidermal growth factor receptor(EGFR)mutated non-small cell lung cancer(NSCLC)using EGFRtyrosine kinase inhibitors(EGFR-TKIs),seriously affects the ...BACKGROUND The emergence of secondary drug resistance when treating epidermal growth factor receptor(EGFR)mutated non-small cell lung cancer(NSCLC)using EGFRtyrosine kinase inhibitors(EGFR-TKIs),seriously affects the therapeutic efficacy and survival of patients.Here,we report a case of advanced NSCLC focusing on the application of multiple biopsy modalities to reveal the development of multiple resistance mechanisms during targeted therapies.CASE SUMMARY A 54-year-old male patient presented with EGFR 19Del-mutated advanced lung adenocarcinoma,and exhibited the development of a T790M mutation during initial TKI treatment.Following 3 mo of Osimertinib treatment,a mixed response was observed.Tissue biopsy of the progressive lesion showed transformation to small cell lung cancer(SCLC)harboring RB1 and TP53 mutations,with loss of the original T790M mutation.A standard chemotherapy regimen with Anlotinib for SCLC was administered.Repeat biopsy revealed adenocarcinoma combined with SCLC after tumor progression.The patient’s overall survival was 24 mo.CONCLUSION Multiple biopsy modalities can reveal the development of multiple resistance mechanisms which help with treatment decision-making.Comprehensive treatment regimens according to the drug resistance mechanism significantly improved the prognosis of such patients.展开更多
Rat-1 cells were transfected with DNA from human esophageal cancer 2K, 4K, 6K, 7K. 8K. The transforming foci were obtained and the transforming cell lines were established. The cell lines can form larger colony in sof...Rat-1 cells were transfected with DNA from human esophageal cancer 2K, 4K, 6K, 7K. 8K. The transforming foci were obtained and the transforming cell lines were established. The cell lines can form larger colony in soft agar. Those nude mice injected subcutaneously with the cells suffered from larger fibrous sarcoma. This indicates that the cell lines have carcinogenicity. The experimental results suggest that human DNA sequence and human Ha-ras special 616Kb (BamHI) band are present in the DNA of the transforming cells. The over-expression of ras gene products P21 were found in the tissues of exophageal cancer, the tissues adjacent to tumor and the transforming cells.展开更多
Non-small cell lung cancer(NSCLC)is the most common form of lung cancer which remains the deadliest malignancy worldwide(Siegel et al.,2019).In general,NSCLC can be divided into several subtypes,including adenocarcino...Non-small cell lung cancer(NSCLC)is the most common form of lung cancer which remains the deadliest malignancy worldwide(Siegel et al.,2019).In general,NSCLC can be divided into several subtypes,including adenocarcinoma(ADC),squamous cell carcinoma(SCC),adeno-squamous cell carcinoma(AD-SCC)and large cell carcinoma(LCC).展开更多
文摘BACKGROUND The emergence of secondary drug resistance when treating epidermal growth factor receptor(EGFR)mutated non-small cell lung cancer(NSCLC)using EGFRtyrosine kinase inhibitors(EGFR-TKIs),seriously affects the therapeutic efficacy and survival of patients.Here,we report a case of advanced NSCLC focusing on the application of multiple biopsy modalities to reveal the development of multiple resistance mechanisms during targeted therapies.CASE SUMMARY A 54-year-old male patient presented with EGFR 19Del-mutated advanced lung adenocarcinoma,and exhibited the development of a T790M mutation during initial TKI treatment.Following 3 mo of Osimertinib treatment,a mixed response was observed.Tissue biopsy of the progressive lesion showed transformation to small cell lung cancer(SCLC)harboring RB1 and TP53 mutations,with loss of the original T790M mutation.A standard chemotherapy regimen with Anlotinib for SCLC was administered.Repeat biopsy revealed adenocarcinoma combined with SCLC after tumor progression.The patient’s overall survival was 24 mo.CONCLUSION Multiple biopsy modalities can reveal the development of multiple resistance mechanisms which help with treatment decision-making.Comprehensive treatment regimens according to the drug resistance mechanism significantly improved the prognosis of such patients.
文摘Rat-1 cells were transfected with DNA from human esophageal cancer 2K, 4K, 6K, 7K. 8K. The transforming foci were obtained and the transforming cell lines were established. The cell lines can form larger colony in soft agar. Those nude mice injected subcutaneously with the cells suffered from larger fibrous sarcoma. This indicates that the cell lines have carcinogenicity. The experimental results suggest that human DNA sequence and human Ha-ras special 616Kb (BamHI) band are present in the DNA of the transforming cells. The over-expression of ras gene products P21 were found in the tissues of exophageal cancer, the tissues adjacent to tumor and the transforming cells.
文摘Non-small cell lung cancer(NSCLC)is the most common form of lung cancer which remains the deadliest malignancy worldwide(Siegel et al.,2019).In general,NSCLC can be divided into several subtypes,including adenocarcinoma(ADC),squamous cell carcinoma(SCC),adeno-squamous cell carcinoma(AD-SCC)and large cell carcinoma(LCC).
