###HUMAN: provide the number of patients whose diagnoses long title is antineoplastic and immunosuppressive drugs causing adverse effects in therapeutic use and drug type is main?, ###ASSISTANT: 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.long_title = "Antineoplastic and immunosuppressive drugs causing adverse effects in therapeutic use" AND prescriptions.drug_type = "MAIN"