A unique epidemiological feature lies hidden within the published statistics files. It is unknown since registries publish mainly survival data and not cancer hazard rates. And yet hazard rates are closely related to cancer biology.. 
I shall describe it in breast cancer yet it is an epidemiological  hallmark of any cancer.
The Bi-Modal Hazard rate (BMH), is unique to cancer and does not appear in other chronic diseases. It is most pronounced in slowly progressing cancers, e.g., prostate  colon  or melanoma.