KRAS gene mutations in lung and gastric cancers in Jiangsu Province / 中国肿瘤临床

Objective:To investigate the KRAS gene mutation features in lung and gastric cancers and their relationship with clinicopathologic characteristics. Methods:A total of 128 lung cancer and 115 gastric cancer patients were included. Polymerase chain reaction amplification and DNA sequencing were conducted to detect mutations in exon 2 of the KRAS gene. Results:The mutation frequency of KRAS was different in lung and gastric cancers;however, it did not show any statistical significance (6.3%vs. 4.3%, P>0.05). The KRAS codon 12 gene mutation ranks the first in both types of cancer. No significant correlation was observed between the prevalence of KRAS mutations and patient's age and gender. KRAS gene mutation rate was higher in lung adenocarcinoma than in non-adenocarcinoma, such as squamous cancer (10.7%vs. 0%, P<0.05). Conclusion:No correlation was found between the KRAS gene mutation and the sex and age of lung and gastric cancer patients in Jiangsu Province. The rate of KRAS mutation was low. KRAS gene mutation rate was relatively higher in lung adenocarcinoma patients;thus, the mutation status of the KRAS gene should be evaluated be-fore undergoing EGFR-TKI therapy.

The quality control and standardization of surface-enhanced laser desorption/ionization time-of-flight mass spectrometry / 中华检验医学杂志

As the advanced technology of proteomics, the surface-enhanced laser desorption/ionization Time-of-Flight Mass Spectrometry(SELDI-TOF-MS)has great potential in clinical application for it′s technological features.Whether it can be applied in clinical trials depends on the quality control and standardization of the technology.In the article, we introduced and discussed the following aspects of the issue.1) quality controlling before sample being analyzed, including the collection and preparation of samples, the selection and conservation of reagents, the calibration and attendance of laboratory apparatus;2) quality controlling during the assay, that is, the validation and analysis of the experimental result;3) the standardization of the continued data handling and analyzing, including the standardization of the analyzed data′s nature, the selection and standardization of the data′s analyzing methods, the system evaluation of the whole SELDI-TOF-MS technological system.