Detection of K-ras mutations in colon cancer by PHA-PHFA (preferential homoduplex formation assay)

T. Funato, Z. Zeng, J. Satoh, J. Fujiwara, M. Kaku, T. Sasaki

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1 Citation (Scopus)


The mutations of K-ras gene have been demonstrated at frequencies of about 40% in human colorectal cancer. We applied a developed PCR-preferential homoduplex formation assay (PCR-PHFA) to detect a point mutation of K-ras gene in the surgical specimens from thirty patients with colorectal cancer. This method is based on the strand competition during hybridization between a double labeled amplicon, prepared from biotin and DNP labeled primers, and an unlabeled amplicon. The procedure of this method is simple and speedy, and suitable to detect mutations in a small number of samples. By using this method, the mutations were found in 37% (11/30) and confirmed by sequencing analysis. The results suggest that the PCR-PHFA system may be useful for detecting low frequent mutation of K-ras gene even in the case of an early cancer.

Original languageEnglish
Pages (from-to)1059-1063
Number of pages5
JournalRinsho byori. The Japanese journal of clinical pathology
Issue number11
Publication statusPublished - 1999 Nov

ASJC Scopus subject areas

  • Medicine(all)


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