The present invention relates to a method for the diagnosis, prognosis, and monitoring of cancer, such as early or late stage ovarian cancer, in a subject by detecting Bcl-2 in a biological sample from the subject, preferably a urine or blood sample. Bcl-2 may be measured using an agent that detects or binds to Bcl-2 protein or an agent that detects or binds to encoding nucleic acids, such as antibodies specifically reactive with Bcl-2 protein or a portion thereof. The invention further relates to kits for carrying out the methods of the invention. The invention further relates to a device for the rapid detection ofBcl-2 in a bodily fluid and methods for rapidly measuring Bcl-2 in a bodily fluid.Cancer, Cancer Diagnostics, Medical, Medical Diagnostics