Could tumors "trigger" a mitochondrial disease?

Tumors: Tumors can trigger either nothing or many things. Surely your doctor is taking care of this. If your health is not moving forward please set up an appointment to see an Oncologist!

Not very likely: mitochondria are "power-houses"--they generate energy from inside all of your cells, except red blood cells. Thus, these are intracellular structures and diseases often result from mutation/genetic defect, drug, certain infections such as HIV/cytmegalovirus--as these go inside cells. Tumors result from mutation/defective DNAs, so possibly can cause mitochondrial disease, but low chance.