instruction: how many of the patients with sec neuroendo tumor-bone had drug administered via ivpca route?
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 = "Sec neuroendo tumor-bone" AND prescriptions.route = "IVPCA"