Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0376358 (prostate cancer)
 59,338 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The purpose of this phase I study is to determine the maximally tolerated doses of paclitaxel and carboplatin (dosed by area under the concentration-time curve) when given at specified times in combination with 6 g/m2 ifosfamide (3 g/m2 at 8 AM on days 1 and 2) with mesna and 5 microg/kg/d filgrastim (from day 4 until the absolute neutrophil count is > 10,000/microL) every 21 days for six cycles. Twelve patients have been treated thus far, 10 of whom are currently eligible for toxicity and response analyses: three each at dose levels 1 and 2, and four at dose level 3. Hematologic toxicity has been the only grade 4 toxicity noted. Only one episode of neutropenic fever occurred in the 43 cycles delivered to date, and only one patient experienced an ifosfamide-related change in mental status. Two patients have developed reversible renal tubular acidosis. No other significant neurologic or renal toxicities have been noted. Patient disease distribution is three non-small cell lung cancer, two breast cancer, two adenocarcinomas of unknown primary site, one prostate cancer, one angioimmunoblastic lymphadenopathy, and one mesothelioma. The median age is 48 years (age range, 34 to 75 years), and median prior chemotherapy treatments was zero. One patient on dose level 1 required a dose delay on cycle 6 because of inadequate hematologic recoveries and one patient required a 50% reduction of the ifosfamide dose during cycle 4 due to mental status change. No patients receiving dose level 2 required dose reductions or delays. One patient at dose level 2 was removed from study due to deterioration of performance status and subsequently died. At dose level 3 dose delays have been required in six of 15 cycles, but no dose reductions have been necessary. Four patients have achieved a complete response (40%) and six a partial response (60%), for a total response rate of 100%. At the completed dose levels, this regimen appears to be tolerable and active with minimal nonhematologic toxicities.
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PMID:Phase I trial of dose-escalated paclitaxel and carboplatin in combination with ifosfamide and filgrastim: preliminary results. 867 55

The ongoing phase I study reported here sought to determine the maximum tolerated doses of paclitaxel (Taxol; Bristol-Myers Squibb Company, Princeton, NJ) and carboplatin when given at specific times in combination with ifosfamide, mesna, and filgrastim. Patients in the trial included those with non-small cell lung cancer (three), breast cancer (two), metastatic adenocarcinomas of unknown primary site (two), prostate cancer (one), angioimmunoblastic lymphadenopathy (one), and mesothelioma (one). The median age of these 10 patients was 48 years (age range, 34 to 75 years) and none had received chemotherapy previously. Of the 12 patients who entered the study, 10 are eligible for analyses of toxicity and response. The only grade 4 toxicity observed was hematologic. One episode of neutropenic fever occurred in the 43 treatment cycles delivered so far, one patient experienced an ifosfamide-related change in mental state, and two patients developed reversible renal tubular acidosis. No other significant neurologic or renal toxicities have been observed. At dose level 1, the cycle-6 doses were delayed in one patient, and another patient required a 50% reduction of the ifosfamide dose during cycle 4 due to mental status change. At dose level 2, there were no dose reductions or delays due to side effects, although one patient withdrew due to disease progression. At dose level 3, dose delays only were required in six of 15 cycles. The response rate was 100%; four patients achieved a complete response (40%) and six a partial response (60%). This regimen appears to be tolerable and active at the dose levels completed thus far, with minimal nonhematologic toxicities.
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PMID:Phase I trial of dose-escalated paclitaxel and carboplatin in combination with ifosfamide and filgrastim: preliminary results. 904 27

The AR (androgen receptor) is a ligand-regulated transcription factor, which belongs to the steroid receptor family and plays an essential role in growth and development of the prostate. Transcriptional activity of steroid receptors is modulated by interaction with co-regulator proteins and yeast two-hybrid analysis is commonly used to identify these steroid receptor-interacting proteins. However, a limitation of conventional two-hybrid systems for detecting AR protein partners has been that they only allow for analysis of the ligand- and DNA-binding domains of the receptor, as its NTD (N-terminal domain) possesses intrinsic transactivation activity. To identify AR N-terminus-interacting proteins, its NTD was used in the RTA (repressed transactivator) system, which is specifically designed for transactivator bait proteins and was shown to be suitable for two-hybrid analysis with the AR NTD. DDC (L-dopa decarboxylase) was detected multiple times as a novel AR-interacting protein, which was subsequently confirmed in vitro and in vivo. Furthermore, transient transfection of DDC in prostate cancer cells strongly enhanced ligand-dependent AR transcriptional activity, an effect that was antagonized using high concentrations of the anti-androgen bicalutamide. Glucocorticoid receptor activity was also strongly enhanced with DDC co-transfection, while oestrogen receptor activity was only mildly affected. Together, our data demonstrate that DDC interacts with AR to enhance steroid receptor transactivation, which may have important implications in prostate cancer progression.
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PMID:Isolation and identification of L-dopa decarboxylase as a protein that binds to and enhances transcriptional activity of the androgen receptor using the repressed transactivator yeast two-hybrid system. 1286 30

Androgen receptor (AR) signaling is fundamental to prostate cancer (PC) progression, and hence, androgen deprivation therapy (ADT) remains a mainstay of treatment. However, augmented AR signaling via both full length AR (AR-FL) and constitutively active AR splice variants, especially AR-V7, is associated with the recurrence of castration resistant prostate cancer (CRPC). Oxidative stress also plays a crucial role in anti-androgen resistance and CRPC outgrowth. We examined whether a triterpenoid antioxidant drug, Bardoxolone-methyl, known as CDDO-Me or RTA 402, can decrease AR-FL and AR-V7 expression in PC cells. Nanomolar (nM) concentrations of CDDO-Me rapidly downregulated AR-FL in LNCaP and C4-2B cells, and both AR-FL and AR-V7 in CWR22Rv1 (22Rv1) cells. The AR-suppressive effect of CDDO-Me was evident at both the mRNA and protein levels. Mechanistically, acute exposure (2 h) to CDDO-Me increased and long-term exposure (24 h) decreased reactive oxygen species (ROS) levels in cells. This was concomitant with an increase in the anti-oxidant transcription factor, Nrf2. The anti-oxidant N-acetyl cysteine (NAC) could overcome this AR-suppressive effect of CDDO-Me. Co-exposure of PC cells to CDDO-Me enhanced the efficacy of a clinically approved anti-androgen, enzalutamide (ENZ), as evident by decreased cell-viability along with migration and colony forming ability of PC cells. Thus, CDDO-Me which is in several late-stage clinical trials, may be used as an adjunct to ADT in PC patients.
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PMID:Bardoxolone-Methyl (CDDO-Me) Suppresses Androgen Receptor and Its Splice-Variant AR-V7 and Enhances Efficacy of Enzalutamide in Prostate Cancer Cells. 3194 Sep 46