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09-07-2007, 06:41 AM
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#1
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Senior Member
Join Date: Mar 2006
Posts: 4,778
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for those with brain mets --new type of therapy being developed
Cancer Res. 2007 Sep 1;67(17):7977-82.
Clostridium perfringens Enterotoxin as a Novel-Targeted Therapeutic for Brain Metastasis.
Kominsky SL, Tyler B, Sosnowski J, Brady K, Doucet M, Nell D, Smedley JG 3rd, McClane B, Brem H, Sukumar S.
Departments of Orthopedic Surgery, Neurosurgery, and Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland.
Brain metastasis is the most commonly occurring intracranial tumor whose incidence seems to be increasing. With standard therapy, the average survival time of patients is approximately 8 months, and treatment often leads to neurologic dysfunction in long-term survivors, emphasizing the need for novel therapeutics. Clostridium perfringens enterotoxin (CPE) has recently been shown to rapidly and specifically destroy cancer cells expressing CPE receptors claudin-3 and claudin-4. Unfortunately, the utility of CPE is precluded by systemic toxicity because its receptors are expressed in numerous organs. Here, we provide the first preclinical evidence that CPE may be uniquely suited to the local treatment of brain metastasis. By immunohistochemical analysis, claudin-3 and claudin-4 were expressed frequently in metastases from breast (15 of 18), lung (15 of 20), and colon (12 of 14) carcinoma, and infrequently in metastases from renal cell carcinoma (2 of 16) and melanoma (2 of 16). In contrast, expression of claudin-3 and claudin-4 was absent in adjacent normal brain tissue. Further examination of the central nervous system (CNS) revealed low or undetectable levels of claudin-3 and claudin-4 in all regions tested by Western and immunohistochemical analysis. Treatment of breast cancer cell lines (MCF-7, MDA-MB-468, NT2.5-luc) and normal human astrocytes with CPE in vitro resulted in rapid and dose-dependent cytolysis exclusively in breast cancer cells, correlating with claudin-3 and claudin-4 expression. Moreover, intracranial CPE treatment significantly inhibited tumor growth and increased survival in two murine models of breast cancer brain metastasis, without any apparent local or systemic toxicity. These data suggest that CPE therapy may have efficacy against a wide variety of brain metastases without CNS toxicity. [Cancer Res 2007;67(17):7977-82].
PMID: 17804705 [PubMed - in process]
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09-08-2007, 04:41 AM
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#2
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Senior Member
Join Date: May 2007
Location: Eastern NC
Posts: 65
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Thank heavens there is finally a good use possible of clostridium endotoxin. It's such a vile bug when it attacks. Just shows there can be a good side to even the worst! And hope for more good things to come! Thanks for sharing.
Rentrac
__________________
Oct. 2003: Dx age 48, Stage IIIA Ductal Ca. dense dose neoadjuvent AC. BrCa 1&2 -, ER+, PR-, Her2+. 2004: R mastectomy, 3+ nodes, dense doseTaxotere ( allergic), total hysterectomy, radiationx36 . Tamoxifen x6 mo., Arimidex x9 mo. Jan. '06: Multi left metastatic nodes left neck. Stage IV. Taxol, Carboplatin (allergic to both), Herceptin, radiationx27. Herceptin cont'd. 1 mediastinal met in old rad field. April: 2 brain mets - Rcerebellar, Ltemporal lobe. Gammaknife. Stop Herceptin, Start Tykerb. May: CyberKnife-mediastinal node, Zometa restart. July: New RLung mets. Xeloda add. Jan. 2008: CT: Lung mets shrinking. Fatty liver w/increased liver function panel. Feb '08: MRI: brain mets back, 2nd GammaKnife. June: Migraine headaches from cerebellar tumor. Team for WBR - Choose Craniotomy on Cerebellum only. Aug: Crainiotomy successful. Sept: PET -right lung apex clean; left internal mammary artery appears malignant. Herceptin in future. Left mastectomy?
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09-08-2007, 12:46 PM
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#3
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Senior Member
Join Date: Jan 2007
Location: UK
Posts: 617
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I am now wondering, how long it takes to go from pre clinical animal model (murine) to phase 1 clinical trial..if it gets there.
__________________
35 y/o
June 06: BC stage I
Grade 3; ER/PR neg
Her-2+++; lumpectomies
Aug 06: Stage IV
liver mets: 6 tumours
July 06 to Jan 07: 2*FEC+6*Taxotere; 3*TACE; LITT
March 07- Sept 07: Vaccination trial (phase 2, peptide based) at the UW (Seattle).
Herceptin since 2006
NED til Oct 09
Recurrence Oct 2009: to internal mammary gland since October 2009 missed on Oct and March 2010 scan.. palpable nodes in May 2010 when I realised..
Nov 2011:7 mets to lungs progressing fast failed hercp/tykerb/xeloda combo..
superior vena cava blocked: stent but face remains puffy
April 2012: Teresa Trial, randomised to TDM1
Nov 2012 progressing on TDM1
Dec 2012 blockage of my airways by tumours, obliteration of these blocking tumours breathing better but hoping for more- at mo too many tumours to count in the lungs and nodes.
Dec 2012 Starting new trial S-222611 phase 1b dual egfr her2+ inhibitor.
'Under no circumstances should you lose hope..' Dalai Lama
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09-08-2007, 02:28 PM
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#4
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Senior Member
Join Date: May 2007
Location: Eastern NC
Posts: 65
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Forever - if you really need it. Only years if it's an intellectual interest.
__________________
Oct. 2003: Dx age 48, Stage IIIA Ductal Ca. dense dose neoadjuvent AC. BrCa 1&2 -, ER+, PR-, Her2+. 2004: R mastectomy, 3+ nodes, dense doseTaxotere ( allergic), total hysterectomy, radiationx36 . Tamoxifen x6 mo., Arimidex x9 mo. Jan. '06: Multi left metastatic nodes left neck. Stage IV. Taxol, Carboplatin (allergic to both), Herceptin, radiationx27. Herceptin cont'd. 1 mediastinal met in old rad field. April: 2 brain mets - Rcerebellar, Ltemporal lobe. Gammaknife. Stop Herceptin, Start Tykerb. May: CyberKnife-mediastinal node, Zometa restart. July: New RLung mets. Xeloda add. Jan. 2008: CT: Lung mets shrinking. Fatty liver w/increased liver function panel. Feb '08: MRI: brain mets back, 2nd GammaKnife. June: Migraine headaches from cerebellar tumor. Team for WBR - Choose Craniotomy on Cerebellum only. Aug: Crainiotomy successful. Sept: PET -right lung apex clean; left internal mammary artery appears malignant. Herceptin in future. Left mastectomy?
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