I’m going on 50+ years diabetic (Type 1, pancreas transplant, Type 2 plus related complications like gastroparesis). I’m currently using a Dexcom G6 continual glucose monitor (CGM) and an Omnipod 5 insulin pump. I just had a follow up visit with my endocrinologist 2 days ago. We fine tuned a bunch of the settings and I’m hopeful of achieving a greater percentage of time in range with less spikes and lows. I too have experienced what I call a blood sugar rollercoaster (blood sugar 19 - 600+). It is terrible! The CGM graph looks like a mountain range! It is possible to flatten it out. Before all the high tech devices I have now. I had Lantus for long term basal coverage. I found that a split dose of 12 hours and 12 hours did work best for me. I had multiple daily injections using Humalog or Lispro with an insulin : carbohydrate ratio for mealtime bolus. There was also a “sliding scale” for correction of blood sugar that was above range. These things helped me. Can you inquire of your provider about these treatment methods? Do you have a different provider treating your cancer? Can they collaborate for your care?