instruction: report the number of patients on pr route of drug administration who were diagnosed with antineoplastic and immunosuppressive drugs causing adverse effects in therapeutic use.
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE diagnoses.short_title = "Adv eff antineoplastic" AND prescriptions.route = "PR"