The subject has received another investigational agent within 21 days of the first dose of study drug The subject has received any other type of investigational agent within 28 days before the first dose of study treatment The participant has received any other type of investigational agent within 28 days before the first dose of study treatment The subject has received any other type of investigational agent within 28 days before the first dose of study treatment The participant has received another investigational agent within 14 days of the first dose of study drug Received any investigational agent within the 14 days before the start of study treatment (1st dose of fludarabine) The subject has received any other type of investigational agent within 28 days before the first dose of study treatment Received any investigational agent within the 14 days before the start of study treatment (1st dose of fludarabine) mCRPC EXPANSION COHORT: The patient has received any other type of investigational agent within 28 days before the first dose of study treatment The subject has received any other type of investigational agent within 28 days before the first dose of study treatment Receipt of any other type of investigational agent within 28 days before the first dose of study treatment The subject has received any other type of investigational agent within 28 days before the first dose of study treatment Any other type of investigational agent within 4 weeks before the first dose of study treatment RENAL COHORT: The subject has received any other type of investigational agent within 28 days before the first dose of study treatment The subject has received any other type of investigational agent within 28 days before the first dose of study treatment Any other type of investigational agent within 28 days before the first dose of study treatment Investigational agent received within 30 days prior to the first dose of study drug The subject has received any other type of investigational agent within 28 days before the first dose of study treatment The subject has received any other type of investigational agent within 28 days before the first dose of study treatment Having received an investigational agent within 30 days prior to the first dose of study treatment The subject has received any other type of investigational agent within 28 days before the first dose of study treatment The participant has received any other type of investigational agent within 28 days before the first dose of study treatment Treatment with any investigational agent within 28 days before the first dose of study treatment Having received an investigational agent with 21 days of receiving the first dose of study drug on this trial Use of any other type of investigational agent or treatment concurrently or within 28 days before the first dose of study treatment The subject has received any other type of investigational agent within 28 days before the first dose of study treatment The subject has received any other type of investigational agent within 28 days before the first dose of study treatment The subject has received any investigational agent within 28 days before the first dose of study treatment Received any investigational agent within the 14 days before the start of study treatment (1st dose of ALT-803)