Detection of circulating cancer cells with K-ras oncogene using membrane array.

Area of Science:

• Oncology
• Molecular Biology
• Biotechnology

Background:

• The K-ras oncogene is prevalent in human cancers, making it a potential marker for circulating cancer cells.
• Current methods for detecting K-ras oncogene-bearing cancer cells in peripheral blood are unreliable.
• Previous research identified 94 differentially expressed genes in K-ras mutant cells.

Purpose of the Study:

• To develop a sensitive diagnostic membrane array for detecting activated K-ras oncogene-associated molecules.
• To assess the feasibility and sensitivity of the membrane array for identifying circulating cancer cells.
• To evaluate the diagnostic performance of the membrane array in cancer patients.

Main Methods:

• Bioinformatic analysis identified 22 genes closely related to the K-ras oncogene.
• Membrane array analysis was performed on in vitro cultured cells and blood specimens from 76 cancer patients.
• Direct sequencing was used to confirm K-ras mutations in patient samples.
• Biostatistical analysis was employed to determine sensitivity, specificity, and accuracy.

Main Results:

• The diagnostic membrane array demonstrated high sensitivity, detecting as few as 5 K-ras oncogene-bearing cancer cells per ml of blood.
• Direct sequencing revealed K-ras mutations in 43 of 76 patients, primarily at codons 13, 15, and 61.
• The membrane array correctly identified 39 positive specimens, with high accuracy for mutations at specific codons.
• The diagnostic membrane array achieved a sensitivity of 83.7%, specificity of 90.9%, and accuracy of 86.8%.

Conclusions:

• The developed K-ras oncogene membrane array is a feasible and highly sensitive diagnostic tool.
• This array shows significant potential for the early detection of cancer cells in peripheral blood.
• The findings support further investigation and clinical application of the K-ras oncogene membrane array for cancer diagnostics.