Every cancer sends out a type-specific signal, as soon as it starts, thus providing the earliest possible diagnosis of the cancer by the cancer itself. These signals can be detected as specific alterations in the low angle X-ray diffraction patterns for skin and/or hair. In addition for some cancers, the intensity of such a signal can also indicate the grade of the cancer. Some such cancers are breast cancer and colon cancers. For other cancers, such as prostate cancers and melanoma the grade of the cancer is indicated by the width-range of the diameter of the added ring. In the case of prostate cancer, the ring moves from between the 13th and 14th orders for Gleason 5 to between the 13th and 15th order for Gleason7 and past the 15th for higher Gleason scores. More rings are involved for other cancers. If more than one cancer is present, each will give its own signal. All signals disappear if and only if the cancer is successfully removed, thus confirming the total removal of the cancer by surgery and/or chemotherapy. Since the added rings in the skin or hair patterns are provided by the cancer itself, these tests must always be one hundred percent accurate, no further verification is necessary. Over four thousand tests have been carried out for breast cancer. Seven hundred and sixty from Finland. Six false positives were found, all of which subsequently were found not to be false. A sensitivity of 100% was recorded for this test and tests for all cancers that have been studied to date.