Institute of Virology of the Slovak Academy of Sciences

Marta Ortova Gut

Silvia Pastorekova

Jaromir Pastorek

Jan Zavada

Miriam Zatovicova

Zuzanna Zavadova

Disclosed herein is the discovery of a soluble MN/CA IX (s-CA IX) found in body fluids, such as, urine and serum. Soluble CA IX comprises the extracellular domain of CA IX or portions thereof. The predominant s-CA IX species is the extracellular domain comprising a proteoglycan-like (PG) domain and carbonic anhydrase (CA) domain, and having a molecular weight of about 50/54 kilodaltons. Diagnostic/prognostic methods for precancer/cancer that detect or detect and quantitate s-CA IX in body fluids, are described. Also disclosed is the coexpression of CA IX and HER-that provides potentially synergistic diagnostic/prognostic and therapeutic strategies for precancer/cancer. Further disclosed are new MN/CA IX-specific antibodies generated from MN/CA IX-deficient mice, useful diagnostically/prognostically and therapeutically for cancer/precancer. Preferred are new antibodies, specific for non-immunodominant epitopes of MN/CA IX, are useful to detect soluble CA IX (s-CA IX) in body fluids, preferably in combination with antibodies specific to immunodominant epitopes of MN/CA IX.

Soluble form of carbonic anhydrase IX (s-CA IX), assays to detect s-CA IX, CA IX'S coexpression with HER-2/neu/c-erbB-2, and CA IX-specific monoclonal antibodies to non-immunodominant epitopes

Disclosed herein is the discovery of a soluble MN/CA IX (s-CA IX) in body fluids, such as, urine and serum. Said s-CA IX comprises the extracellular domain of CA IX or portions thereof. The predominant s-CA IX species is the extracellular domain comprising a proteoglycan-like (PG) domain and carbonic anhydrase (CA) domain, and having a molecular weight of about 50/54 kilodaltons (kd) upon Western blot. A smaller s-CA IX form of about 20 to about 30 kd comprising the CA domain or parts thereof, not linked to the PG domain, has also been found in body fluids. Diagnostic/prognostic methods for precancer and cancer that detect or detect and quantitate said s-CA IX in body fluids, are described. Also disclosed herein is the coexpression of CA IX and HER-2/neu/c-erbB-2 that provides parallel, alternative and potentially synergistic diagnostic/prognostic and therapeutic strategies for precancer and cancer. Further disclosed are new MN/CA IX-specific antibodies generated from MN/CA IX-deficient mice, preferably monoclonal antibodies and immunoreactive fragments and engineered variants thereof. Such new MN/CA IX-specific antibodies, fragments and variants are useful diagnostically/prognostically and therapeutically for cancer and precancer. Particularly preferred are the new monoclonal antibodies, fragments and variants that are specific for the non-immunodominant epitopes of MN/CA IX, which antibodies are, among other uses, useful to detect soluble MN/CA IX (s-CA IX) in body fluids, alone but preferably in combination with antibodies specific to the immunodominant epitopes of MN/CA IX, for example, in a sandwich assay.

Soluble form of carbonic anhydrase IX (s-CA IX), assays to detect s-CA IX, CA IX's coexpression with HER-2/neu/c-erbB-2, and CA IX-specific monoclonal antibodies to non-immunodominant epitopes

Disclosed herein is the discovery of a soluble MN/CA IX (s-CA IX) found in body fluids, such as, urine and serum. Soluble CA IX comprises the extracellular domain of CA IX or portions thereof. The predominant s-CA IX species is the extracellular domain comprising a proteoglycan-like (PG) domain and carbonic anhydrase (CA) domain, and having a molecular weight of about 50/54 kilodaltons. Diagnostic/prognostic methods for precancer/cancer that detect or detect and quantitate s-CA IX in body fluids, are described. Also disclosed is the coexpression of CA IX and HER-2 that provides potentially synergistic diagnostic/prognostic and therapeutic strategies for precancer/cancer. Further disclosed are new MN/CA IX-specific antibodies generated from MN/CA IX-deficient mice, useful diagnostically/prognostically and therapeutically for cancer/precancer. Preferred are new antibodies, specific for non-immunodominant epitopes of MN/CA IX, useful to detect soluble CA IX (s-CA IX) in body fluids, preferably in combination with antibodies specific to immunodominant epitopes of MN/CA IX.

Soluble form of carbonic anhydrase IX (S-CA IX), assays to detect s-CA IX, CA IX'S coexpression with HER-2/NEU/C-ERBB-2, and CA IX-specific monoclonal antibodies to non-immunodominant epitopes

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Prague, Czechia

Marta Ortova Gut