FOLH1 and neoplasm: Serial SPECT/CT imaging for 4P28ζN+ or control (4PTrN+, non-PSMA-targeting) T cells in tumor-bearing mice was performed over 14 d p.t, showing increased 99mTcO4- activity in tumors treated with 4P28ζN+ T cells and no significantly increased signal in tumors treated with 4PTrN+ T cells.