DETAILED DESCRIPTION What is claimed is: 1.
A method for detecting and localizing a tumor which either produces or is associated with an intracellular marker substance, which comprises injecting a subject parenterally with an antibody specific to said marker substance and radiolabeled with a pharmacologically inert radioisotope capable of detection using a photoscanning device, and subsequently scanning with said device to detect and locate the site or sites of uptake of said labeled antibody by said tumor; with the proviso that when said antibody is an antibody specific to human chlorionic gonadotropin or its beta-subunit, said radioisotope is other than Tc-99m.
2.
The method of claim 1, wherein said marker-specific antibody is a substantially monospecific antibody having a marker-specific immunoreactivity prior to labeling of at least 70% and a cross-reactivity to non-tumor-associated antigens of less than 15%.
3.
The method of claim 2, wherein said substantially monospecific antibody is a monoclonal antibody.
4.
The method of claim 2, wherein said antibody is radiolabeled to an extent sufficient to reduce its marker-specific immunoreactivity by from 5 to 33%.
5.
The method of claim 4, wherein said substantially monospecific antibody is radiolabeled with Iodine-131 or Iodine-123, an average of at least 5 atoms of iodine per antibody molecule being introduced by direct substitution of iodine for hydrogen on the antibody molecule.
6.
The method of claim 1, wherein said radioisotope is one of Iodine-131, Iodine-123, Iodine-126, Iodine-133, Bromine-77, Indium-111, Indium-113m, Gallium-67, Gallium-68, Ruthenium 95, Ruthenium-97, Ruthenium-103, Ruthenium-105, Mercury-107, Mercury-203, Rhenium-99m, Rhenium-105, Rhenium-101, Tellurium-121m, Tellurium-122m, Tellurium-125m, Thulium-165, Thulium-167, Thulium-168, Technetium-99m and Fluorine-18.
7.
The method of claim 1, wherein said marker substance is an oncofetal antigen.
8.
The method of claim 1, wherein said marker substance is a placental antigen
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Molecular Biology 
