If no grade 2 or higher adverse events are observed with the 1st cohort, concurrent enrolment will proceed to recruit a second set of 3 healthy adult subjects and the second set of 3 prostate cancer patients. The second cohort of subjects will be subjected to the same design but with an escalation of the dose to 2-3 x 107 Cell Sense-labeled autologous PBMC administered intradermally.