I guess it will be difficult for you to find either in the current literature or even from personal communication from other scientists, levels of all those biomarkers you can trust for interpreting your own studies. I suggest you read the following guidelines, that may be of help in the design of approaches to autophagy in cancer cells:
Klionsky DJ, Abdelmohsen K, Abe A, et al. Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition). Autophagy. 2016;12(1):1-222.
Here is a link to a colleague from Cardiff University who does a lot on autophagy, some of his papers may be useful to you: https://www.cardiff.ac.uk/people/view/126767-tee-andrew