Abstract:
:The clinical formulation of leucovorin (5-CHO-FH4) is a mixture of diastereoisomers with markedly different pharmacologic properties. Comparatively little information is available concerning the cellular pharmacology of reduced folate stereoisomers, due largely to the difficulty in preparing sufficient quantities of these compounds for in vitro use. Recent improvements in HPLC technology have now facilitated this process, enabling studies of folate stereochemistry on a larger scale. Using purified (6R) and (6S) leucovorin, we examined the effects of these compounds on the enzymatic activity of Lactobacillus casei thymidylate synthase (TS) in a cell-free system. The natural (6S), unnatural (6R), and racemic (6R,S) leucovorin preparations inhibited TS activity by 50% at concentrations of 0.11, 2.1, and 0.52 mM, respectively. Dixon plots demonstrated the inhibition to be competitive, with Ki values of 85 microM, 1.59 mM, and 385 microM for (6S), (6R), and (6R,S) leucovorin, respectively. In view of the high doses of leucovorin given clinically and the slow clearance of the unnatural isomer, our observations suggest that leucovorin may have important direct inhibitory effects on folate-requiring enzymes.
journal_name
Cancer Chemother Pharmacoljournal_title
Cancer chemotherapy and pharmacologyauthors
Lee PP,Schilsky RLdoi
10.1007/BF02897229subject
Has Abstractpub_date
1990-01-01 00:00:00pages
273-7issue
4eissn
0344-5704issn
1432-0843journal_volume
26pub_type
杂志文章abstract:PURPOSE:Cyclophosphamide is a cytotoxic chemotherapy drug that causes severe damages to hematopoietic and gastrointestinal systems. The aim of this study is to evaluate the protective effects of recombinant human interleukin-1 receptor antagonist (rhIL-1Ra) on chemotherapy-induced mucositis (CIM) in a murine model of c...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-010-1439-1
更新日期:2011-06-01 00:00:00
abstract:PURPOSE:Peritoneal dissemination is the most frequent and life-threatening mode of metastasis and recurrence in patients with gastric cancer. A multicenter phase II study was designed to evaluate the efficacy and tolerability of S-1 and docetaxel combination chemotherapy regimen for the treatment of advanced or recurre...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,多中心研究
doi:10.1007/s00280-013-2086-0
更新日期:2013-04-01 00:00:00
abstract::The effect of selenite coadministration on the toxicity and antitumor activity of repeated treatment with high doses of cis-diamminedichloroplatinum (cis-DDP) was examined in mice. Sodium selenite was injected s.c. into separate abdominal sites of mice together with cis-DDP at a molar ratio of 1:3.5 (selenite to cis-D...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00685594
更新日期:1992-01-01 00:00:00
abstract:BACKGROUND:The factors which affect the 6-month continuation of adjuvant chemotherapy with S-1 have not been fully evaluated in pancreatic cancer. The objective of this retrospective study was to clarify the risk factors for the discontinuation of S-1 adjuvant chemotherapy after 6 months of treatment. METHODS:The stud...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-014-2601-y
更新日期:2014-12-01 00:00:00
abstract::Etoposide has been used in the treatment of a wide variety of neoplasms, including small-cell lung cancer, Kaposi's sarcoma, testicular cancer, acute leukemia, and lymphoma. Its current therapeutic use is limited by myelosuppression, particularly neutropenia. Pharmacodynamic studies of etoposide show that this toxicit...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,评审
doi:10.1007/BF00684866
更新日期:1994-01-01 00:00:00
abstract:PURPOSE:Thymidylate synthase (TS) is one of the target molecules for the antitumor effects of fluoropyrimidine drugs. The cellular thymidylate synthase level is one of the determining factors for the antitumor activity of fluoropyrimidines. TYMS, which encodes TS, has been reported to possess 28-bp tandem repeat sequen...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-005-1018-z
更新日期:2005-11-01 00:00:00
abstract::A randomized controlled clinical trial was conducted to compare the use of farmorubicin (FARM) and adriamycin (ADR) in Lipiodol transcatheter arterial chemoembolization (L-TAE) as a treatment of hepatocellular carcinoma. In all, 192 hospitals participated, and 415 patients were enrolled in the study during the period ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1007/BF00686677
更新日期:1994-01-01 00:00:00
abstract:PURPOSE:Pemetrexed, a multi-targeted antifolate that disrupts synthesis of both purines and pyrimidines, is approved for use in malignant pleural mesothelioma and non-small cell lung cancer. Pemetrexed is currently being evaluated for anti-tumor activity in a variety of solid and central nervous system tumors. We studi...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-006-0285-7
更新日期:2007-03-01 00:00:00
abstract:PURPOSE:As a follow-up to our previous findings that platinum drugs induce a key enzyme in polyamine catabolism, gene expression profiling and mathematical modeling were used to define the effects of cisplatin and oxaliplatin on the expression of polyamine metabolic pathway genes in A2780 human ovarian carcinoma cells....
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-006-0325-3
更新日期:2007-05-01 00:00:00
abstract:PURPOSE:The absorption, distribution, metabolism, and excretion of the hedgehog pathway inhibitor sonidegib (LDE225) were determined in healthy male subjects. METHODS:Six subjects received a single oral dose of 800 mg ¹⁴C-sonidegib (74 kBq, 2.0 µCi) under fasting conditions. Blood, plasma, urine, and fecal samples wer...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-014-2468-y
更新日期:2014-07-01 00:00:00
abstract:PURPOSE:The purpose of this investigation was to evaluate the effectiveness of oral 5-(phenylthio)acyclouridine (PTAU) in reducing 5-fluorouracil (FUra) host-toxicity and enhancing its chemotherapeutic efficacy against human colon tumors. PTAU is a potent and specific inhibitor of uridine phosphorylase (UrdPase, EC 2.4...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-006-0213-x
更新日期:2006-11-01 00:00:00
abstract:PURPOSE:The activity of 5-fluorouracil (5-FU) against colon cancer is enhanced by leucovorin and the combination of 5-FU and levamisole has activity in the adjuvant treatment of colonic malignancies. The combination of 5-FU with both leucovorin and levamisole may provide additional benefit in the treatment of colon can...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/s002800050576
更新日期:1997-01-01 00:00:00
abstract::UCN-01 (7-hydroxystaurosporine; NSC 638850) is a protein kinase antagonist selected for clinical trial based in part on evidence of efficacy in a preclinical renal carcinoma xenograft model. Schedule studies and in vitro studies suggested that a 72-h continuous infusion would be appropriate. In rats and dogs, maximum ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章
doi:10.1007/s002800051080
更新日期:1998-01-01 00:00:00
abstract:PURPOSE:Thalidomide, originally developed as a sedative, was subsequently identified to have antiangiogenic properties. Lenalidomide is an antiangiogenic and immunomodulatory agent that has been utilized in the treatment of patients with brain tumors. We studied the pharmacokinetics and cerebrospinal fluid (CSF) penetr...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-011-1781-y
更新日期:2012-04-01 00:00:00
abstract:PURPOSE:In gemcitabine-pretreated pancreatic cancer, salvage chemotherapy has not been established, and the prognostic factors are not completely known. The purpose of this study was to determine the efficacy and safety of infusional 5-fluorouracil (5-FU), doxorubicin, and mitomycin-C (iFAM) in patients with gemcitabin...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章
doi:10.1007/s00280-011-1584-1
更新日期:2011-10-01 00:00:00
abstract::The cellular metabolism of 3'-amino-2',3'-dideoxycytidine (3'-NH2-dCyd), a cytotoxic agent previously reported to be a poor substrate for purified Cyd/dCyd deaminase (dCydD), was compared with that of cytosine arabinoside (ara-C) in cells that displayed dCydD activity (HeLa) and in cells that did not (L1210). Growth i...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00686406
更新日期:1992-01-01 00:00:00
abstract::Thirty-two evaluable patients with advanced measurable gastric adenocarcinoma were treated with a combination of 5-fluorouracil, adriamycin, and BCNU (FAB). Two complete and fourteen partial responses were observed, with an overall response rate of 50%. The median duration of response was 10 months, and the median sur...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章
doi:10.1007/BF00256545
更新日期:1984-01-01 00:00:00
abstract::Fourteen new agents of natural products origin which are under development as antitumor agents at the National Cancer Institute are discussed with reference to their sources, structures, antitumor activity, current status, and future prospects as clinically effective agents. ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00254042
更新日期:1978-01-01 00:00:00
abstract:PURPOSE:Anti-epidermal growth factor receptor antibody therapy alone or in combination with irinotecan is recognized as a standard third-line treatment for KRAS wild-type unresectable metastatic colorectal cancer. However, in some cases, it is difficult to administer irinotecan after third-line treatment. Therefore, we...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,多中心研究
doi:10.1007/s00280-016-3109-4
更新日期:2016-09-01 00:00:00
abstract:PURPOSE:In clinical trials, the epidermal growth factor receptor tyrosine kinase inhibitor (EGFR-TKI) administered concomitantly with first-line cytotoxicity chemotherapy failed to confer a survival benefit to patients with non-small-cell lung cancer (NSCLC). The aim of this study was to test whether paclitaxel followe...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-010-1347-4
更新日期:2011-03-01 00:00:00
abstract:PURPOSE:Temozolomide pharmacokinetics were evaluated in children receiving concurrent O(6)-benzylguanine (O(6)BG), which enhanced the hematological toxicity of temozolomide. METHODS:Temozolomide was administered orally, daily for 5 days starting at 28 mg/m(2) per day with escalations to 40, 55, 75 and 100 mg/m(2) per ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-009-1015-8
更新日期:2009-12-01 00:00:00
abstract::The oral bioavailability of methotrexate is variable and may be dose-dependent. The absorption of 'interval' oral methotrexate, which is given between cycles of chemotherapy, is unknown. The bioavailability of oral methotrexate has been studied in eight patients, acting as their own controls, to assess the effect of s...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/BF00257121
更新日期:1984-01-01 00:00:00
abstract:PURPOSE:Preclinical research and prior clinical observations demonstrated reduced toxicity and suggested enhanced efficacy of cisplatin due to folic acid and vitamin B12 suppletion. In this randomized phase 2 trial, we evaluated the addition of folic acid and vitamin B12 to first-line palliative cisplatin and gemcitabi...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00280-018-3588-6
更新日期:2018-07-01 00:00:00
abstract:PURPOSE:The chimeric protein BCR-ABL, a constitutively active protein-tyrosine kinase, triggers downstream signalling proteins, such as STAT3, ultimately resulting in the survival of myeloid progenitors in BCR-ABL-positive leukemias. Here, we evaluated the effect of LLL-3, an inhibitor of STAT3 activity, on cell viabil...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-009-1109-3
更新日期:2010-05-01 00:00:00
abstract:PURPOSE:To differentiate the antagonistic and agonistic effect of toremifene at the level of the hypothalamus-hypophysis axis a leutinizing hormone-releasing hormone (LHRH) test was performed during a phase II clinical trial. METHODS:In 15 postmenopausal patients with advanced breast cancer, follicle-stimulating hormo...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s002800050811
更新日期:1998-01-01 00:00:00
abstract:PURPOSE:This phase I study assessed the safety, tolerability, maximum tolerated dose (MTD), pharmacokinetics, and preliminary antitumor effects of sunitinib combined with modified FOLFOX6 (mFOLFOX6). METHODS:Patients with advanced solid malignancies received mFOLFOX6 in 2-week cycles with escalating sunitinib doses (2...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-012-1880-4
更新日期:2012-07-01 00:00:00
abstract:INTRODUCTION:Despite the extensive clinical experience with irinotecan, significant concerns remain regarding its toxicity. In a phase I trial, we modulated irinotecan pharmacokinetics by inhibiting biliary excretion of SN-38, the active metabolite of irinotecan, using cyclosporine. The modulation appeared to decrease ...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 临床试验,杂志文章,多中心研究
doi:10.1007/s00280-005-1020-5
更新日期:2005-10-01 00:00:00
abstract:PURPOSE:The purpose of this study was to assess the therapeutic and toxicological effects of cesium chloride (CsCl) administration in mice bearing prostate cancer tumors. METHODS:Three CsCl dose titration studies were completed in tumor-bearing and non-tumor-bearing athymic nude mice. All mice were administered either...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章
doi:10.1007/s00280-007-0429-4
更新日期:2007-11-01 00:00:00
abstract::The stability of solutions of the antitumour antimetabolites, vinca alkaloids, podophyllotoxins, interferons, steroids and platinum drugs as well as maytansine, asparaginase, amsacrine, flavone-8-acetic acid, mitoguazone, and N-phosphonoacetyl-L-aspartate (PALA) is reviewed. Much of the published work has been done wi...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,评审
doi:10.1007/BF00451642
更新日期:1989-01-01 00:00:00
abstract:PURPOSE:Gemcitabine/cisplatin combination therapy has been the standard palliative chemotherapy for patients with advanced biliary tract cancer (BTC). We aimed to evaluate the efficacy and safety of adding S-1 to gemcitabine/cisplatin combination therapy for patients with advanced BTC. METHODS:Patients with histologic...
journal_title:Cancer chemotherapy and pharmacology
pub_type: 杂志文章,多中心研究
doi:10.1007/s00280-014-2648-9
更新日期:2015-02-01 00:00:00