K-RAS Oncogene Mutation in Patients With Advanced Non-Small Cell Lung Cancer Associated With Exposure to Wood Smoke and Tobacco Smoking: Therapeutic Implications (007/055/OMI)
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|ClinicalTrials.gov Identifier: NCT01023828|
Recruitment Status : Completed
First Posted : December 2, 2009
Last Update Posted : June 29, 2012
Non-small cell lung cancer (NSCLC) is the leading cause of cancer-related death in the world. This neoplasia has a poor survival prognosis due to the low effectiveness of existing treatments. The low effectiveness is associated with the development of an intrinsic and acquired resistance of tumors, which clinically shows through early progression and transitory responses. Tobacco smoking is the major risk factor for NSCLC; however, wood smoke has been described as a strong carcinogen and a relevant risk factor for the development of NSCLC. Current data indicates that lung tumors associated with tobacco smoking and wood smoke show different clinical characteristics, which suggests that they might also have different genetic alterations, which are a consequence of tumor etiology. The description of the frequency and the type of mutations associated with different etiologies of NSCLC could represent the starting point for benefiting each patient according to their specific characteristics. One of the most researched signaling pathways related to cancer cell proliferation is the one activated by the K-RAS oncogene. Active K-RAS mutations have been detected in different types of neoplasia and more than 90% of these mutations occur at codon 12 of the oncogene. These mutations seem to be an independent risk factor for the prognosis of malignant tumors and they are associated with the lack of response to erlotinib, which is a tyrosine-kinase inhibitor. The investigators' research team has recently reported that wood smoke is an independent factor for survival and response to the erlotinib treatment, which suggests that this carcinogen could have a different frequency and pattern of mutations in the K-RAS oncogene, compared to what has been reported in smoking patients. Determining the tumor mutations within the K-RAS oncogene can help improve the response prognosis of patients with advanced NSCLC who have a background of exposure to different factors associated with the appearance of this neoplasia, such as wood smoke exposure or tobacco smoking. Therefore, the objective of this research is to determine the frequency and the type of mutations at codon 12 of the K-RAS oncogene in patients with NSCLC who have a background of exposure to tobacco smoking or wood smoke.
|Condition or disease|
|Non-Small Cell Lung Cancer|
Show Detailed Description
|Study Type :||Observational|
|Actual Enrollment :||150 participants|
|Official Title:||K-RAS Oncogene Mutation in Patients With Advanced Non-Small Cell Lung Cancer Associated With Exposure to Wood Smoke and Tobacco Smoking: Therapeutic Implications|
|Study Start Date :||April 2005|
|Actual Primary Completion Date :||January 2010|
|Actual Study Completion Date :||June 2012|
Group of patients with diagnosis of NSCLC and exposure to tabacco smoking
Patients whit diagnosis of NSCLC and exposure to wood smoke
TABACCO SMOKING AND WOOD SMOKE
Patients whit diagnosis of NSCLC and exposure to tabacco smoking and wood smoke
Patients whit diagnosis of NSCLC and whitout exposure to risk factor
- History of smoking and wood smoke exposure [ Time Frame: Exposure factor ]Tumor specimens were collected at the time of diagnosis. WSE was defined as being exposed to fumes resulting from burning wood in fireplaces and wood stoves for >5 years for at least 4 hours per day. The WSE index was calculated by multiplying the number of daily hours exposed by the number of years' exposure. A non-smoker was defined as being someone having a lifetime exposure of less than 100 cigarettes; the tobacco smoking index was calculated by multiplying the number of cigarette packs consumed per day by the number of years spent smoking.
- KRAS and EGFR mutations [ Time Frame: Genotyping ]EGFR (exon 18-21) and KRAS gene mutations from some samples were detected by Therascreen RGQ PCR Kit (QUIAGEN, Scorpions ARMS method), according to the manufacturer's instructions from the four arms.
Biospecimen Retention: Samples With DNA
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Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01023828
|Instituto Nacional de Cancerología|
|Mexico, Mexico City, Mexico, 14080|
|Principal Investigator:||Oscar Arrieta, MD; MsC||Instituto Nacional de Cancerología|