Stage 4 lung cancer no chemo tumor grew & cancer spread, clinical trial only now, on oxygen for sob, blood clots in legs, what is life expectancy?

Hard to say/depends.: At this stage of lung cancer, the options are limited as is survival. If treatment is done , it's usually chemotherapy and radiation and/or surgery after adjuvant chemotherapy. There are certainly trials out there and i would recommend talking to your doctor before starting any, but the chance for success is likely limited, as the 5 year survival of stage IV is <5%, but it doesn't hurt to try.

Does not sound good: With all you are explaining, life expectancy may not be as long as we hope. Typically patients with progressive disease and clots have a shorter survival. My thoughts and prayers extended to you.