instruction: what number of patients having diagnosed with malig neo ascend colon had also the lab test category as hematology?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN lab ON demographic.hadm_id = lab.hadm_id WHERE diagnoses.short_title = "Malig neo ascend colon" AND lab."CATEGORY" = "Hematology"