Abstract: The invention features devices and methods for detecting, enriching, and analyzing circulating tumor cells and other particles. The invention further features methods of diagnosing a condition, e.g., cancer, in a subject by analyzing a cellular sample from the subject.

Abstract: A system and method for authorization control including a storage device and an authorization module. The storage device stores multiple study requirement records and study history records. The authorization module receives an authorization request with a check item ID and an operator ID, acquires a first document ID set corresponding to the check item ID by querying the study requirement records, acquires a second document ID set corresponding to the operator ID by querying the study history records, and returns a rejection message when the first document ID set is not subset of the second document ID set.