Methods of diagnosing, detecting or treating cancer where the cancer expresses a tumor cell antigen that is elevated relative to the normal adjacent tissue, by administering an antibody or antibody fragment which binds to that tumor cell antigen. The methods involve the use of antibodies that bind to the tumor cell antigens KIAA1815, LOC157378, FU20421, DSCD75, GPR160, GPCR41, and SLC1A5.