Immunohistochemical determination of thymidylate synthase in colorectal cancer—methodological studies

With the aid of specific monoclonal antibodies, an immunohistochemical technique has recently been developed for the detection of intratumoral thymidylate synthase (TS). This technique can be applied to paraffin-embedded material suitable for retrospective studies. In order to examine this technique...

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Bibliographic Details
Published in:European journal of cancer (1990) 1997-11, Vol.33 (13), p.2278-2281
Main Authors: Edler, D., Blomgren, H., Allegra, C.J., Johnston, P.G., Lagerstedt, U., Magnusson, I., Ragnhammar, P.
Format: Article
Language:English
Subjects:
Adult
Aged
Aged, 80 and over
Biological and medical sciences
Biomarkers, Tumor - metabolism
Colonic Neoplasms - enzymology
Colonic Neoplasms - pathology
colorectal cancer
Digestive system
Dukes' stage
enzyme activity
Female
heterogeneity
Humans
Immunoenzyme Techniques
immunohistochemical determination
Investigative techniques, diagnostic techniques (general aspects)
Male
Medical sciences
Medicin och hälsovetenskap
Middle Aged
Neoplasm Staging
Paraffin Embedding
Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques
Rectal Neoplasms - enzymology
Rectal Neoplasms - pathology
Retrospective Studies
thymidylate synthase
Thymidylate Synthase - metabolism
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Summary:With the aid of specific monoclonal antibodies, an immunohistochemical technique has recently been developed for the detection of intratumoral thymidylate synthase (TS). This technique can be applied to paraffin-embedded material suitable for retrospective studies. In order to examine this technique further, the TS enzyme activity of lysates from frozen-stored colorectal cancer (CRC) specimens were compared with their immunohistochemical TS staining intensity (arbitrarily graded from 0 to 3). A statistically significant correlation between these two methods on a total of 25 tumour specimens ( P< 0.001) was observed. The staining intensity in different areas of4S paraffin-embedded CRCs was examined. Sixty-seven per cent of the tumours were homogeneously stained (either grades 0–1 or 2–3), 33% showed a heterogeneity in TS staining. Increased TS expression correlated with more advanced Dukes' stage ( P< 0.001). It is concluded that TS immunostaining intensity reflects TS enzyme activity in colorectal tumours and is well suited for paraffin-embedded material. The TS immunostaining pattern is heterogeneous in up to one-third of the tumours.
ISSN:0959-8049
1879-0852
DOI:10.1016/S0959-8049(97)00306-7