Abstract
Background
Preoperative assessment of the anticancer drug sensitivity of tumors plays an important role in the selection of therapy. If evaluation of the 5-FU sensitivity of microtissue specimens obtained by techniques such as core needle biopsy could be performed, the addition of fluorouracil to adriamycin and cyclophosphamide may further enhance response rates. In order to evaluate a simple sensitivity test for the anti-tumor agent 5-fluorouracil (5-FU), we examined whether an assay of a small sample could measure mRNA to predict the activities of thymidylate synthase (TS) and dihydropyrimidine dehydrogenase (DPD). In addition, gene abnormalities on chromosomes 1 and 18 corresponding to DPD, TS and the relationships between the gene abnormalities and the amount of mRNA and activity were examined.
Method
TS and DPD activity were measured using the fluorodeoxyuridine monophosphate ligand binding assay and radio enzymatic assay, respectively, while mRNA levels were assayed by real-time polymerase chain reaction. Chromosome 1 and 18 aberrations were investigated by fluorescencein situ hybridization (FISH) with centromere probes.
Results
TS mRNA and TS activity showed a positive correlation (r = 0.518,p = 0.0017). TS activity and TS mRNA were significantly higher in the nuclear grade 3 group than in the other groups (p = 0.04,p = 0.0072, respectively). TS activity and mRNA in tumor tissue tended to decrease in the progesterone receptor positive groups (p = 0.059,p = 0.066, respectively). There was no correlation between DPD mRNA and DPD activity in tumor tissue (r = 0.139,p = 0.4423). DPD mRNA was measured as 282.88 ± 170.68 copies/cell in tumor tissue and 635.88 ± 310.04 copies/cell in normal tissue, and was thus significantly higher in normal tissue (p < 0.001).
Conclusions
TS mRNA showed a positive correlation with TS activity, suggesting that this method of using small amounts of tissue can replace anti-cancer drug sensitivity tests.
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Abbreviations
- TS:
-
Thymidylate synthase
- DPD:
-
Dihydropyrimidine Dehydrogenase
- 5-FU:
-
5-fluorouracil
- FUDP:
-
Fluorouridine diphosphate
- FdUMP:
-
Fluorodeoxyuridine monophsphate
- FISH:
-
Fluorescencein situ hybridization
- PCR:
-
Polymerase chain reaction
- ER:
-
Estrogen receptor
- PgR:
-
Progesterone receptorM
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Ota, D., Kusama, M., Kaise, H. et al. Evaluation of sensitivity to 5-FU on the basis of thymidylate synthase (TS)/dihydropyrimidine dehydrogenase(DPD) activity and chromosomal analysis in micro tissue specimens of breast cancer. Breast Cancer 11, 356–366 (2004). https://doi.org/10.1007/BF02968043
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DOI: https://doi.org/10.1007/BF02968043