First Line Gefitinib by FDG-PET Metabolic Response
- Registration Number
- NCT01510990
- Lead Sponsor
- Asan Medical Center
- Brief Summary
When considering 1st line gefitinib treatment for NSCLC, the investigators need epidermal growth factor receptor (EGFR) mutational status of the tumor. But most patients do not give us such information at the time of diagnosis, because it requires tumor tissue and some time period for EGFR examination. So, investigators develop a protocol of 1st line gefitinib treatment for NSCLC according to FDG-PET response. If a patient shows 20% or more decrease of peak standard uptake value (SUV) after 1 week's gefitinib treatment, he or she will be continued the treatment. If a patient shows less than 20% decrease of SUV, he or she will be switched to other chemotherapy.
- Detailed Description
Gefitinib has anti-tumor activity as a result of EGFR tyrosine kinase inhibition, reducing multiple downstream signaling processes that activate cell proliferation and other cell responses, including cell migration angiogenesis, and reduced apoptosis. Recently, it has been approved for the first line treatment of advanced NSCLC that harbors EGFR mutation. In IPASS trial, tumors with EGFR mutation produced 71.2% of clinical response to first line gefitinib while tumors with wild type EGFR showed only 1.1% of response. Therefore, patient selection is critical for the clinical use of EGFR tyrosine kinase inhibitors as first line treatment.
When considering 1st line gefitinib treatment for NSCLC, we need EGFR mutational status of the tumor. But most patients do not give us such information at the time of diagnosis, because it requires tumor tissue and some time period for EGFR examination. So, we need other strategies such as using PET scan for early prediction of response to gefitinib.
Glucose metabolic activity closely reflects responses to gefitinib therapy. In preclinical study with gefitinib sensitive cell lines, there was a dramatic decrease in FDG uptake as early as 2 hours after treatment. And these metabolic alterations preceded changes in cell cycle distribution, thymidine uptake and apoptosis. In contrast, gefitinib resistant cells exhibited no measurable changes in FDG uptake, either in cell culture or in vivo.
The strategy using FDG-PET may guide us to perform 1st line geftinib. Recently investigators reported that FLT-PET or FDG-PET could predict response to EGFR tyrosine kinase (TKI) early after 1 week of treatment. And % decrease more than 20% of maximum SUV of main lesion after 1 week of EGFR TKI treatment could predict response to that drug. More than 20% decrease of SUV is a significant change during reproducibility test and also considered as a criteria for response prediction of paclitaxel/cisplatin chemotherapy.
So, investigators develop a protocol of 1st line gefitinib treatment for NSCLC according to FDG-PET response. And if the patient showed less than 20% decrease of peak SUV, investigators will stop gefitinib and treat him or her with the regimen of pemetrexed/cisplatin.
Recruitment & Eligibility
- Status
- UNKNOWN
- Sex
- All
- Target Recruitment
- 60
Not provided
Not provided
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description Gefitinib Gefitinib After a baseline 18F FDG-PET, patients are treated with gefitinib 250mg/d as 1st line treatment for 7 days. And follow up 18F-FDG PET image is acquired after 1 week's treatment of gefitinib (with window period +/- 2 days). If % decrease of peak SUV of main lesion is 20% or more, gefitinib treatment is continued till progression, unacceptable toxicities or patient's refusal. But if % decrease of peak SUV of main lesion less than 20% or peak SUV increase, gefitinib treatment is stopped, and changed to Pemetrexed/Cisplatin chemotherapy.
- Primary Outcome Measures
Name Time Method Objective Response rate one year The primary objective is to see the response rate of gefitinib in the patients who showed % decrease of peak SUV of main lesion 20% or more and continuously treated with gefitinib.
- Secondary Outcome Measures
Name Time Method Objective response rate by EGFR mutational status One year The secondary object is to see the relationship of changes in FDG uptake after gefitinib treatment with EGFR mutation; sensitivity, specificity, positive predictive value, and negative predictive value will be calculated comparing the groupings created by FDG-PET and actual EGFR mutational status.
Trial Locations
- Locations (1)
Asan Medical Center
🇰🇷Seoul, Korea, Republic of