Detection of c-Ki-ras mutations in faecal samples from sporadic colorectal cancer patients.

Abstract:

:Colonic exfoliated epithelial cells in faecal material provide a source of human DNA which has been analysed for the presence of the tumour marker ras, in order to detect early tumour cells. The stool samples were subjected to a preliminary sample preparation step followed by centrifugation. DNA was extracted from both the centrifugation pellet and supernatant fractions, as well as from endoscopy washings, using a conventional phenol chloroform extraction method and was then purified on glass milk or spin columns. The purified DNA was amplified using mitochondrial primers and analysed for ras mutations using a non-radioactive, allele specific mismatch method. Corresponding tumour DNA was analysed for mutations using the same method. The results show that approximately 50% of the faecal samples analysed exhibited the presence of ras mutations which were also observed in the corresponding tumours. A double mutation was detected in one supernatant. Our findings represent an important stage in the development of a diagnostic test for the early detection of colorectal cancer.

journal_name

Gut

journal_title

Gut

authors

Smith-Ravin J,England J,Talbot IC,Bodmer W

doi

10.1136/gut.36.1.81

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

81-6

issue

1

eissn

0017-5749

issn

1468-3288

journal_volume

36

pub_type

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