A method is provided for detecting and/or measuring the occurrence of an enzyme in the form of CYP1B1 in a patient for the detection of cancer in said patient. The method includes the steps of administering a reporter substrate to a patient; taking a bodily fluid and/or tissue sample from the patient after one or more pre-determined periods of time; and analyzing the bodily fluid and/or tissue sample in vitro for the occurrence and/or measurement of a metabolite of the reporter substrate caused as a result of metabolism of the reporter substrate by said enzyme in said patient during said pre-determined period of time.