I am taking CBD and THC for my sarcoma. What dosage do you recommend? 66yrs old, 7 1/2 Stone, 45 kg

I have pleomorphic sarcoma metastatic lungs (56yr old male, 180lbs)... Told by dr 28:1 CBD:thc is right ratio tincture... Looking into it now. Starting yondelis at same time after Aldox/ gemzar trial then ifex chemo regimens already this year