AMAS blood testing can be useful for the early detection of cancer. In breast cancer, the test can detect the presence of cancerous cells up to 18 months before more conventional detection methods. This is an FDA approved test which has proved useful in early detection and monitoring treatment. The test results should return to normal within 3 months after successful treatment for cancer, otherwise cancerous cells remain. The test will not tell you where the cancer is located, just whether it is present or not. Additional information is available from Oncolab, located in Boston, Massachusetts and other Internet sources.