Wen Gao1, Jing He1, Shi-Dai Jin1, Jing Xu1, Tong-Fu Yu2, Wei Wang3, Quan Zhu2, Hui Dai4, Hao Wu1, Yi-Qian Liu1, Yong-Qian Shu1, Ren-Hua Guo1. 1. Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, People's Republic of China. 2. Department of Radiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, People's Republic of China. 3. Department of Thoracic Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, People's Republic of China. 4. Medical Records Statistics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, People's Republic of China.
Abstract
BACKGROUND: The present study analyzed the relationship between clinical features and the T790M mutation in non-small cell lung cancer (NSCLC) patients resistant to epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) treatment. METHODS: NSCLC patients with resistance to first-generation EGFR-TKIs in which the disease control time was more than 6 months after initial TKI treatment were enrolled. T790M mutation analysis was performed using one of the following methods according to each manufacturer's protocols: Cobas EGFR mutation test (41/105, 39.0%), digital PCR (42/105, 40.0%) or Scorpion amplification refractory mutation system (ARMS) (22/105, 21.0%). Sample type of T790M was from tissue only (53/105, 50.5%), plasma only (46/105, 43.8%), tissue and plasma (6/105, 5.7%). RESULTS: Of 105 patients, 57 were T790M-positive and 48 were T790M-negative. T790M-positive patients had longer progression-free survival (PFS) after initial EGFR-TKI treatment (p = 0.019). T790M positivity was more frequent in patients treated with gefitinib than in those treated with icotinib (65% vs 40.54%, p = 0.018). The rate of T790M positivity was lower in patients with EGFR L858R (44.44%, 12/27) before TKI treatment than in those with EGFR 19del (72.0%, 36/50, p = 0.036). Patients who achieved PR after initial EGFR-TKI treatment had a higher rate of T790M positivity than those with SD (75.76% vs 50%, p = 0.023). There was no relationship between T790M status and age, gender, primary site, metastasis site, or treatment before TKI. CONCLUSION: Progression-free survival (PFS), drug type, response to initial EGFR-TKI treatment, and EGFR status before initial EGFR treatment were associated with the frequency of T790M mutation.
BACKGROUND: The present study analyzed the relationship between clinical features and the T790M mutation in non-small cell lung cancer (NSCLC) patients resistant to epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) treatment. METHODS: NSCLC patients with resistance to first-generation EGFR-TKIs in which the disease control time was more than 6 months after initial TKI treatment were enrolled. T790M mutation analysis was performed using one of the following methods according to each manufacturer's protocols: Cobas EGFR mutation test (41/105, 39.0%), digital PCR (42/105, 40.0%) or Scorpion amplification refractory mutation system (ARMS) (22/105, 21.0%). Sample type of T790M was from tissue only (53/105, 50.5%), plasma only (46/105, 43.8%), tissue and plasma (6/105, 5.7%). RESULTS: Of 105 patients, 57 were T790M-positive and 48 were T790M-negative. T790M-positive patients had longer progression-free survival (PFS) after initial EGFR-TKI treatment (p = 0.019). T790M positivity was more frequent in patients treated with gefitinib than in those treated with icotinib (65% vs 40.54%, p = 0.018). The rate of T790M positivity was lower in patients with EGFR L858R (44.44%, 12/27) before TKI treatment than in those with EGFR 19del (72.0%, 36/50, p = 0.036). Patients who achieved PR after initial EGFR-TKI treatment had a higher rate of T790M positivity than those with SD (75.76% vs 50%, p = 0.023). There was no relationship between T790M status and age, gender, primary site, metastasis site, or treatment before TKI. CONCLUSION: Progression-free survival (PFS), drug type, response to initial EGFR-TKI treatment, and EGFR status before initial EGFR treatment were associated with the frequency of T790M mutation.
Authors: Helena A Yu; Maria E Arcila; Natasha Rekhtman; Camelia S Sima; Maureen F Zakowski; William Pao; Mark G Kris; Vincent A Miller; Marc Ladanyi; Gregory J Riely Journal: Clin Cancer Res Date: 2013-03-07 Impact factor: 12.531
Authors: Darren A E Cross; Susan E Ashton; Serban Ghiorghiu; Cath Eberlein; Caroline A Nebhan; Paula J Spitzler; Jonathon P Orme; M Raymond V Finlay; Richard A Ward; Martine J Mellor; Gareth Hughes; Amar Rahi; Vivien N Jacobs; Monica Red Brewer; Eiki Ichihara; Jing Sun; Hailing Jin; Peter Ballard; Katherine Al-Kadhimi; Rachel Rowlinson; Teresa Klinowska; Graham H P Richmond; Mireille Cantarini; Dong-Wan Kim; Malcolm R Ranson; William Pao Journal: Cancer Discov Date: 2014-06-03 Impact factor: 39.397