My mother is a lung cancer patient with different metastases in brain and bone. I heard that tetracycline derivatives may shrink tumors and may be able to stop metastases.
Tetracycline derivatives are indeed in clinical trials in cancer patients.
I don't know if your mother is eligible for any of them. They have shown promising results for some tumors, but not necessarily for lung cancer. I do believe it's too premature to recommend tetracycline-based derivatives for your mother's cancer. Hope this helps. Experts appearing on this page are independent and are solely responsible for editing and fact-checking their material.