[Correlation between 5-fluorouracil (5-FU) sensitivity as measured by collagen gel droplet embedded culture drug sensitivity test (CD-DST) and expression of orotate phosphoribosyl transferase (OPRT), thymidylate synthase (TS), and dihydropyrimidine dehydrogenase (DPD) in colorectal cancer].
Gan To Kagaku Ryoho 2001;
28:661-7. [PMID:
11383215]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
The levels of OPRT, DPD, and TS were determined in colorectal cancer tissue specimens, and 5-FU sensitivity was measured by CD-DST. The correlation between enzyme activity and 5-FU sensitivity was then studied. Six patients with colorectal carcinoma who had undergone surgical resection in our institution between May and August 2000 were studied. The CD-DST method was used to measure the sensitivity to 5-FU under three sets of conditions: 0.2 microgram/ml x 5 days (A), 1.0 microgram/ml x 1 day (B), and 10.0 micrograms/ml x 3 h (C). The coefficients of correlation of tumor sensitivity to 5-FU and OPRT activity were A: 0.8246, B: 0.7670, and C: 0.7856, and to DPD activity were A: 0.2525, B: 0.3928, and C: 0.4337, while the coefficients of correlation to TS enzyme levels were A: -0.5240, B: -0.4770, and C: -0.6131. These findings demonstrate a high degree of correlation between OPRT activity at the tumor site and tumor sensitivity to 5-FU under a variety of conditions, suggesting that OPRT activity can be a useful indicator in predicting the anti-tumor effectiveness of 5-FU for a specific tumor.
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