Patents by Inventor Kahan Leong
Kahan Leong has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8414898Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STEAP” (Six Transmembrane Epithelial Antigens of the Prostate). Four particular human STEAPs are described and characterized herein. The prototype member of the STEAP family, STEAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STEAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and intracellular N- and C-termini, suggesting that it folds in a “serpentine” manner into three extracellular and two intracellular loops. STEAP-1 protein expression is maintained at high levels across various stages of prostate cancer. Moreover, STEAP-1 is highly over-expressed in certain other human cancers.Type: GrantFiled: June 13, 2011Date of Patent: April 9, 2013Assignee: Genentech, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Stephen Chappell Mitchell
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Patent number: 8383777Abstract: A novel prostate tumor associated gene (designated 24P4C12) and its encoded protein is described. 24P4C12 is highly expressed in prostate tissue xenografts, providing evidence that it is turned on in at least some prostate cancers. 24P4C12 provides a diagnostic and/or therapeutic target for prostate and other cancers.Type: GrantFiled: August 20, 2007Date of Patent: February 26, 2013Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran
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Publication number: 20110318371Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STEAP” (Six Transmembrane Epithelial Antigens of the Prostate). Four particular human STEAPs are described and characterized herein. The prototype member of the STEAP family, STEAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STEAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and intracellular N- and C-termini, suggesting that it folds in a “serpentine” manner into three extracellular and two intracellular loops. STEAP-1 protein expression is maintained at high levels across various stages of prostate cancer. Moreover, STEAP-1 is highly over-expressed in certain other human cancers.Type: ApplicationFiled: June 13, 2011Publication date: December 29, 2011Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Stephen Chappell Mitchell
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BPC-1: a secreted brain-specific protein expressed and secreted by prostate and bladder cancer cells
Patent number: 8003758Abstract: Described is a novel gene and its encoded secreted tumor antigen, termed BPC-1, and to diagnostic and therapeutic methods and compositions useful in the management of various cancers which express BPC-1, particularly including prostate cancer and bladder cancer. In human normal tissues, BPC-1 is only expressed in certain tissues of the brain. However, BPC-1 is expressed at high levels in prostate cancer cells and is also expressed in bladder cancer cells. The structure of BPC-1 includes a signal sequence and a CUB domain. BPC-1 protein is secreted. Preliminary experimental evidence suggests that BPC-1 is directly involved in oncogenesis or maintenance of the transformed phenotype of cancer cells expressing BPC-1. BPC-1 also appears to bind specifically to a cellular protein expressed in prostate cancer cells and other cells.Type: GrantFiled: March 5, 2010Date of Patent: August 23, 2011Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Aya Jakobovits -
Patent number: 7981624Abstract: Compositions for the diagnosis and therapy of prostate and colon cancer, derived from or based on a novel prostate-specific, androgen-regulated, cell membrane associated and secreted serine protease termed 20P1F12/TMPRSS2 are described. A full length cDNA comprising the entire coding sequence of the 20P1F12/TMPRSS2 gene (also designated 20P1F12-GTC1 herein) is provided (FIG. 1). Among the compositions provided are antibodies that bind to 20P1F12/TMPRSS2 proteins and polypeptide fragments thereof, including antibodies labeled with a detectable marker or toxin or therapeutic composition. The invention also provides prognostic and diagnostic methods of examining a biological sample for evidence of disregulated cellular growth by comparing the status of 20P1F12/TMPRSS2 in the biological sample to the status of 20P1F12/TMPRSS2 in a corresponding normal sample, wherein alterations in the status of 20P1F12/TMPRSS2 in the biological sample are associated with disregulated cellular growth.Type: GrantFiled: February 19, 2009Date of Patent: July 19, 2011Assignee: Agensys, Inc.Inventors: Daniel E. H. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas Saffran, Stephen C. Mitchell, Aya Jakobovits, Mary Faris, Igor Vivanco
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Patent number: 7968307Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STEAP” (Six Transmembrane Epithelial Antigens of the Prostate). Four particular human STEAPs are described and characterized herein. The prototype member of the STEAP family, STEAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STEAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and intracellular N- and C-termini, suggesting that it folds in a “serpentine” manner into three extracellular and two intracellular loops. STEAP-1 protein expression is maintained at high levels across various stages of prostate cancer. Moreover, STEAP-1 is highly over-expressed in certain other human cancers.Type: GrantFiled: October 7, 2009Date of Patent: June 28, 2011Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Stephen Chappell Mitchell
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Patent number: 7928201Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STEAP” (Six Transmembrane Epithelial Antigens of the Prostate). Four particular human STEAPs are described and characterized herein. The prototype member of the STEAP family, STEAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STEAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and intracellular N- and C-termini, suggesting that it folds in a “serpentine” manner into three extracellular and two intracellular loops. STEAP-1 protein expression is maintained at high levels across various stages of prostate cancer. Moreover, STEAP-1 is highly over-expressed in certain other human cancers.Type: GrantFiled: October 7, 2009Date of Patent: April 19, 2011Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Stephen Chappell Mitchell
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Patent number: 7858760Abstract: A novel prostate tumor associated gene (designated 24P4C12) and its encoded protein is described. 24P4C12 is highly expressed in prostate tissue xenografts, providing evidence that it is turned on in at least some prostate cancers. 24P4C12 provides a diagnostic and/or therapeutic target for prostate and other cancers.Type: GrantFiled: September 7, 2004Date of Patent: December 28, 2010Assignee: Agensys, Inc.Inventors: Daniel E. H. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas Saffran
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BPC-1: a secreted brain-specific protein expressed and secreted by prostate and bladder cancer cells
Patent number: 7785811Abstract: Described is a novel gene and its encoded secreted tumor antigen, termed BPC-1, and to diagnostic and therapeutic methods and compositions useful in the management of various cancers which express BPC-1, particularly including prostate cancer and bladder cancer. In human normal tissues, BPC-1 is only expressed in certain tissues of the brain. However, BPC-1 is expressed at high levels in prostate cancer cells and is also expressed in bladder cancer cells. The structure of BPC-1 includes a signal sequence and a CUB domain. BPC-1 protein is secreted. Preliminary experimental evidence suggests that BPC-1 is directly involved in oncogenesis or maintenance of the transformed phenotype of cancer cells expressing BPC-1. BPC-1 also appears to bind specifically to a cellular protein expressed in prostate cancer cells and other cells.Type: GrantFiled: February 18, 2005Date of Patent: August 31, 2010Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas Saffran, Aya Jakobovits -
Publication number: 20100190962Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STEAP” (Six Transmembrane Epithelial Antigens of the Prostate). Four particular human STEAPs are described and characterized herein. The prototype member of the STEAP family, STEAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STEAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and intracellular N- and C-termini, suggesting that it folds in a “serpentine” manner into three extracellular and two intracellular loops. STEAP-1 protein expression is maintained at high levels across various stages of prostate cancer. Moreover, STEAP-1 is highly over-expressed in certain other human cancers.Type: ApplicationFiled: October 7, 2009Publication date: July 29, 2010Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Stephen Chappell Mitchell
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Publication number: 20100173297Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STEAP” (Six Transmembrane Epithelial Antigens of the Prostate). Four particular human STEAPs are described and characterized herein. The prototype member of the STEAP family, STEAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STEAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and intracellular N- and C-termini, suggesting that it folds in a “serpentine” manner into three extracellular and two intracellular loops. STEAP-1 protein expression is maintained at high levels across various stages of prostate cancer. Moreover, STEAP-1 is highly over-expressed in certain other human cancers.Type: ApplicationFiled: October 7, 2009Publication date: July 8, 2010Inventors: DANIEL E. AFAR, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Stephen Chappell Mitchell
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BPC-1: A SECRETED BRAIN-SPECIFIC PROTEIN EXPRESSED AND SECRETED BY PROSTATE AND BLADDER CANCER CELLS
Publication number: 20100168027Abstract: Described is a novel gene and its encoded secreted tumor antigen, termed BPC-1, and to diagnostic and therapeutic methods and compositions useful in the management of various cancers which express BPC-1, particularly including prostate cancer and bladder cancer. In human normal tissues, BPC-1 is only expressed in certain tissues of the brain. However, BPC-1 is expressed at high levels in prostate cancer cells and is also expressed in bladder cancer cells. The structure of BPC-1 includes a signal sequence and a CUB domain. BPC-1 protein is secreted. Preliminary experimental evidence suggests that BPC-1 is directly involved in oncogenesis or maintenance of the transformed phenotype of cancer cells expressing BPC-1. BPC-1 also appears to bind specifically to a cellular protein expressed in prostate cancer cells and other cells.Type: ApplicationFiled: March 5, 2010Publication date: July 1, 2010Applicant: AGENSYS, INC.Inventors: Daniel E. AFAR, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Aya Jakobovits -
Patent number: 7642054Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STRAP” Serpentine TRansmembrane Antigens of the Prostate). Four particular human STRAPs are described and characterized herein. The human STRAPs exhibit a high degree of structural conservation among them but show no significant structural homology to any known human proteins. The prototype member of the STRAP family, STRAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STRAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and Intracellular N- and C-termini, suggesting that It folds In a “serpentine” manner Into three extracellular and two intracellular loops.Type: GrantFiled: September 12, 2005Date of Patent: January 5, 2010Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Stephen Chappell Mitchell
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Patent number: 7611904Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STEAP” (SIX Transmembrane Epithelial Antigens of the Prostate). Four particular human STEAPs are described and characterized herein. The human STEAPs exhibit a high degree of structural conservation among them but show no significant structural homology to any known human proteins. The prototype member of the STEAP family, STEAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STEAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and intracellular N- and C-termini, suggesting that it folds in a “serpentine” manner into three extracellular and two intracellular loops.Type: GrantFiled: October 12, 2006Date of Patent: November 3, 2009Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran, Stephen Chappell Mitchell
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Publication number: 20090226921Abstract: Compositions for the diagnosis and therapy of prostate and colon cancer, derived from or based on a novel prostate-specific, androgen-regulated, cell membrane associated and secreted serine protease termed 20P1F12/TMPRSS2 are described. A full length cDNA comprising the entire coding sequence of the 20P1F12/TMPRSS2 gene (also designated 20P1F12-GTC1 herein) is provided (FIG. 1). Among the compositions provided are antibodies that bind to 20P1F12/TMPRSS2 proteins and polypeptide fragments thereof, including antibodies labeled with a detectable marker or toxin or therapeutic composition. The invention also provides prognostic and diagnostic methods of examining a biological sample for evidence of disregulated cellular growth by comparing the status of 20P1F12/TMPRSS2 in the biological sample to the status of 20P1F12/TMPRSS2 in a corresponding normal sample, wherein alterations in the status of 20P1F12/TMPRSS2 in the biological sample are associated with disregulated cellular growth.Type: ApplicationFiled: February 19, 2009Publication date: September 10, 2009Inventors: Daniel E. H. AFAR, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas Saffran, Stephen C. Mitchell, Aya Jakobovits, Mary Faris, Igor Vivanco
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Patent number: 7575749Abstract: Described is a novel family of cell surface serpentine transmembrane antigens. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed “STEAP” (Six Transmembrane Epithelial Antigens of the Prostate). Four particular human STEAPs are described and characterized herein. The human STEAPs exhibit a high degree of structural conservation among them but show no significant structural homology to any known human proteins. The prototype member of the STEAP family, STEAP-1, appears to be a type IIIa membrane protein expressed predominantly in prostate cells in normal human tissues. Structurally, STEAP-1 is a 339 amino acid protein characterized by a molecular topology of six transmembrane domains and intracellular N- and C-termini, suggesting that it folds in a “serpentine” manner into three extracellular and two intracellular loops.Type: GrantFiled: June 1, 2004Date of Patent: August 18, 2009Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas Saffran, Steven Chappell Mitchell
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Publication number: 20080178308Abstract: A novel prostate tumor associated gene (designated 24P4C12) and its encoded protein is described. 24P4C12 is highly expressed in prostate tissue xenografts, providing evidence that it is turned on in at least some prostate cancers. 24P4C12 provides a diagnostic and/or therapeutic target for prostate and other cancers.Type: ApplicationFiled: August 20, 2007Publication date: July 24, 2008Applicant: AGENSYS, INC.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran
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Patent number: 7306796Abstract: A novel prostate tumor associated gene (designated 24P4C12) and its encoded protein is described. 24P4C12 is highly expressed in prostate tissue xenografts, providing evidence that it is turned on in at least some prostate cancers. 24P4C12 provides a diagnostic and/or therapeutic target for prostate and other cancers.Type: GrantFiled: October 30, 2002Date of Patent: December 11, 2007Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran
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Patent number: 7227008Abstract: A novel prostate tumor associated gene (designated 24P4C12) and its encoded protein is described. 24P4C12 is highly expressed in prostate tissue xenografts, providing evidence that it is turned on in at least some prostate cancers. 24P4C12 provides a diagnostic and/or therapeutic target for prostate and other cancers.Type: GrantFiled: March 23, 2004Date of Patent: June 5, 2007Assignee: Agensys, Inc.Inventors: Daniel E. H. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran
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Patent number: 7220823Abstract: A novel prostate tumor associated gene (designated 24P4C12) and its encoded protein is described. 24P4C12 is highly expressed in prostate tissue xenografts, providing evidence that it is turned on in at least some prostate cancers. 24P4C12 provides a diagnostic and/or therapeutic target for prostate and other cancers.Type: GrantFiled: October 30, 2002Date of Patent: May 22, 2007Assignee: Agensys, Inc.Inventors: Daniel E. Afar, Rene S. Hubert, Kahan Leong, Arthur B. Raitano, Douglas C. Saffran