Landmann Landmann C C Hunig Hunig R R Prostatic specific antigen asan indicator of response to radiotherapy in prostate cancer Prostatic specific antigen asan indicator of response to radiotherapy in prostate cancer Int J Radiat Oncol Biol Phys Int J Radiat Oncol Biol Phys 1989 1989 17 17 1073 1073 6 6 2478510 2478510. This evidence concerns the gene KLK3 and prostate cancer.