Tumor localization and therapy with labeled antibodies to cell surface antigens
First Claim
1. A method for detecting and localizing a tumor having on its cell surface a tumor-associated or tumorspecific antigen, which comprises injecting a human subject parenterally with an antibody specific to said antigen and radiolabeled with a pharmacologically inert radioisotope capable of detection using a photoscanning device, and with indifferent immunoglobulin from the same or different species as that used to prepare said specific antibody, said indifferent immunoglobulin being radiolabeled with a different pharmacologically inert radioisotope emitting at an energy capable of independent detection using said photoscanning device, the radiolabeling being so effected that the kinetics and distribution of the radiolabeled specific antibody and indifferent immunoglobulin in said subject are substantially the same during the time period required for scanning;
- and scanning the subject with said photoscanning device, the level of activity of the labeled indifferent immunoglobulin being used to determine the distribution of background activity due to non-targeted specific antibody, said background activity being subtracted from the total activity of specific antibody, whereby the activity of substantially only the targeted tumor-localized specific antibody is determined and said tumor is thereby detected and localized.
0 Assignments
0 Petitions
Accused Products
Abstract
Improved methods are provided for using radiolabeled antibodies to tumor cell surface antigens to locate, diagnose and stage tumors having such antigens on their cell surfaces by external photoscanning, whereby significantly increased resolution, convenience and/or efficiency of operation may be achieved. A method is provided for using highly specific radiolabeled antibodies to cell surface antigens for tumor therapy. Radiolabeled antibodies and injectable compositions containing them are provided for use in the method of the invention.
-
Citations
28 Claims
-
1. A method for detecting and localizing a tumor having on its cell surface a tumor-associated or tumorspecific antigen, which comprises injecting a human subject parenterally with an antibody specific to said antigen and radiolabeled with a pharmacologically inert radioisotope capable of detection using a photoscanning device, and with indifferent immunoglobulin from the same or different species as that used to prepare said specific antibody, said indifferent immunoglobulin being radiolabeled with a different pharmacologically inert radioisotope emitting at an energy capable of independent detection using said photoscanning device, the radiolabeling being so effected that the kinetics and distribution of the radiolabeled specific antibody and indifferent immunoglobulin in said subject are substantially the same during the time period required for scanning;
- and scanning the subject with said photoscanning device, the level of activity of the labeled indifferent immunoglobulin being used to determine the distribution of background activity due to non-targeted specific antibody, said background activity being subtracted from the total activity of specific antibody, whereby the activity of substantially only the targeted tumor-localized specific antibody is determined and said tumor is thereby detected and localized.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
11. A method of tumor radiotherapy, which comprises parenterally injecting into a human subject having a tumor which produces or is associated with a tumor cell surface antigen a tumor-reducing amount of an antibody which is specific to said antigen and radiolabeled with a pharmacologically inert, radiotherapeutically effective radioisotope;
- wherein said antibody is substantially monospecific to said antigen, having a specific immunoreactivity prior to labeling of at least 70% and a crossreactivity to other antigens of less than 15%.
- View Dependent Claims (12, 13, 14, 15)
-
16. A method of tumor radiotherapy, which comprises the steps of parenterally injecting into a human subject having a tumor which produces or is associated with a tumor cell surface antigen a radiotherapeutically effective amount of an antibody which is specific to said antigen and radiolabeled with a pharmacologically inert radioisotope capable of detection with a photoscanning device, said labeled antibody further comtaining in chemical combination an addend containing at least five atoms of boron with at least a natural abundance of Boron-10 isotope;
- locating said tumor by scanning the subject with said photoscanning device to determine the location of the resultant uptake of said labeled antibody by said tumor; and
directing a beam of thermal neutrons at said tumor location. - View Dependent Claims (17, 18, 19, 20)
- locating said tumor by scanning the subject with said photoscanning device to determine the location of the resultant uptake of said labeled antibody by said tumor; and
- 21. A radiolabeled, boron-conjugated antibody which is specific to a tumor-associated or tumor-specific tumor cell surface antigen, said antibody being radiolabeled with a pharmacologically inert radioisotope capable of detection with a photoscanning device, said labeled antibody further containing in chemical combination an addend containing at least five atoms of boron with at least a natural abundance of Boron-10 isotope.
-
23. An injectable composition, comprising
(a) an antibody specific to a tumor-associated or tumor-specific tumor cell surface antigen and radiolabeled with a pharmacologically inert radioisotope capable of detection using a photoscanning device; -
(b) indifferent immunoglobulin from the same or different species as that used to prepare said specific antibody, said indifferent immunoglobulin being radiolabeled with a different pharmacologically inert radioisotope emitting at an energy capable of independent detection using said photoscanning device; and (c) a pharmaceutically acceptable injection vehicle; wherein the radiolabeling is so effected that the kinetics and distribution of the radiolabeled specific antibody and indifferent immunoglobulin will be substantially the same in a human subject during a period of time following injection sufficient for localization and detection. - View Dependent Claims (24, 25, 26, 27, 28)
-
Specification