Biomaterial Database

Thymidine labeling index of human breast carcinoma. Enhancement of in vitro labeling by 5-fluorouracil and 5-fluoro-2'-deoxyuridine. 1977

J S Meyer, and R Facher

Inhibitors of thymidylate synthetase, 5-fluoro-2'-deoxyuridine (FUDR) and 5-fluorouracil (FU), enhanced in vitro thymidine labeling of human breast carcinoma cells. Their use resulted in an increase in the measured thymidine labeling index (TLI) of breast carcinomas by increasing detectability of labeled nuclei in autoradiographs. The TLI was measured with FU or FUDR enhancement in primary breast carcinomas from nine women younger than age 50, and from 30 women 50 years or older. The mean and geometric mean TLI were 8.0 and 6.3 respectively for the younger group, and 4.0 and 2.8 respectively for the older group. Similar significant age-associated differences were noted in a series of 133 TLI measurements without FU or FUDR. The TLI was not significantly correlated with primary breast carcinoma size or number of axillary nodal metastases. The capacity to form axillary metastases must be related to factors other than the rate of cell replication in breast carcinomas.

UI	MeSH Term	Description	Entries
D008780	Methyltransferases	A subclass of enzymes of the transferase class that catalyze the transfer of a methyl group from one compound to another. (Dorland, 28th ed) EC 2.1.1.	Methyltransferase
D008875	Middle Aged	An adult aged 45 - 64 years.	Middle Age
D001943	Breast Neoplasms	Tumors or cancer of the human BREAST.	Breast Cancer,Breast Tumors,Cancer of Breast,Breast Carcinoma,Cancer of the Breast,Human Mammary Carcinoma,Malignant Neoplasm of Breast,Malignant Tumor of Breast,Mammary Cancer,Mammary Carcinoma, Human,Mammary Neoplasm, Human,Mammary Neoplasms, Human,Neoplasms, Breast,Tumors, Breast,Breast Carcinomas,Breast Malignant Neoplasm,Breast Malignant Neoplasms,Breast Malignant Tumor,Breast Malignant Tumors,Breast Neoplasm,Breast Tumor,Cancer, Breast,Cancer, Mammary,Cancers, Mammary,Carcinoma, Breast,Carcinoma, Human Mammary,Carcinomas, Breast,Carcinomas, Human Mammary,Human Mammary Carcinomas,Human Mammary Neoplasm,Human Mammary Neoplasms,Mammary Cancers,Mammary Carcinomas, Human,Neoplasm, Breast,Neoplasm, Human Mammary,Neoplasms, Human Mammary,Tumor, Breast
D004273	DNA, Neoplasm	DNA present in neoplastic tissue.	Neoplasm DNA
D005260	Female		Females
D005467	Floxuridine	An antineoplastic antimetabolite that is metabolized to fluorouracil when administered by rapid injection; when administered by slow, continuous, intra-arterial infusion, it is converted to floxuridine monophosphate. It has been used to treat hepatic metastases of gastrointestinal adenocarcinomas and for palliation in malignant neoplasms of the liver and gastrointestinal tract.	FUdR,Fluorodeoxyuridine,5-FUdR,5-Fluorodeoxyuridine,5 Fluorodeoxyuridine
D005472	Fluorouracil	A pyrimidine analog that is an antineoplastic antimetabolite. It interferes with DNA synthesis by blocking the THYMIDYLATE SYNTHETASE conversion of deoxyuridylic acid to thymidylic acid.	5-FU,5-FU Lederle,5-FU Medac,5-Fluorouracil,5-Fluorouracil-Biosyn,5-HU Hexal,5FU,Adrucil,Carac,Efudex,Efudix,Fluoro-Uracile ICN,Fluoroplex,Fluorouracil Mononitrate,Fluorouracil Monopotassium Salt,Fluorouracil Monosodium Salt,Fluorouracil Potassium Salt,Fluorouracil-GRY,Fluorouracile Dakota,Fluorouracilo Ferrer Far,Fluoruracil,Fluracedyl,Flurodex,Haemato-FU,Neofluor,Onkofluor,Ribofluor,5 FU Lederle,5 FU Medac,5 Fluorouracil,5 Fluorouracil Biosyn,5 HU Hexal,Dakota, Fluorouracile,Fluoro Uracile ICN,Fluorouracil GRY,Haemato FU
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013940	Thymidylate Synthase	An enzyme of the transferase class that catalyzes the reaction 5,10-methylenetetrahydrofolate and dUMP to dihydrofolate and dTMP in the synthesis of thymidine triphosphate. (From Dorland, 27th ed) EC 2.1.1.45.	Thymidylate Synthetase,Synthase, Thymidylate,Synthetase, Thymidylate
D066298	In Vitro Techniques	Methods to study reactions or processes taking place in an artificial environment outside the living organism.	In Vitro Test,In Vitro Testing,In Vitro Tests,In Vitro as Topic,In Vitro,In Vitro Technique,In Vitro Testings,Technique, In Vitro,Techniques, In Vitro,Test, In Vitro,Testing, In Vitro,Testings, In Vitro,Tests, In Vitro,Vitro Testing, In