Jenny wrote a great book called “Cancer Free! Are You Sure?” which is a compilation of many tests one can do for early warning of cancer. She maintains that the industry standard is to wait for lumps to appear and that there are many medical tests which can alert patients to patterns that can indicate cancer may be able to progress if left alone. She also has a website: www.nolumporbump.com
Here is thermography chapter of her great book which contains over 35 tests that can save your life.
https://issuu.com/radiantbodythermography/docs/chapter35thermographyexambyhrbacekjenny