The present invention relates generally to antibodies and
antigen-binding fragments thereof, in particular those targeting
cancer- associated antigens, compositions comprising the same, and methods and uses thereof for detecting
cancer-associated antigens in tissues, including
prostate cancer tissues. Also provided herein are methods for detecting
prostate cancer in a subject, methods for detecting and measuring the severity of
prostate cancer in a subject, methods for monitoring the progression of
prostate cancer in a subject, methods for determining the likelihood of the presence of
prostate cancer in a subject, methods for identifying a subject suffering from
prostate cancer who is likely to respond to
cancer therapy, methods for predicting the risk of recurrence of prostate cancer in a subject following treatment with a
cancer therapy, methods for treating prostate cancer in a subject, methods of stratifying a subject for prostate
cancer therapy, uses of anti-cancer agent in the manufacture of a medicament for treating prostate cancer in a subject, and an anti-cancer agent for use in the treatment of prostate cancer in a subject, based upon the detection of
specific protein biomarkers with the antibodies described herein. Also contemplated are immunoassays, including
immunohistochemistry (IHC) and
immunofluorescence (IF), to detect
specific protein biomarkers in biological samples. The preferred biomarkers include endosomal proteins, such as Adaptor
protein, phosphotyrosine interacting with PH domain and
leucine zipper 1 (APPL1), sortilin-1 (SORT1), Syndecan-1 (SDC1).