Knowledge and confirmation of tumor reduction would have come from direct measurement, something done during RECIST criteria assessment at baseline, 2 months, 4 months, and 6 months. Still more than a month away from direct measure.

The only data leaks that could be true are serum marker reduction or increased p23, if the qPCR has even run yet. There could be anecdotal data from care givers such as reduction in pain medication, patient reported increased feelings of wellness, increased range of motion for affected body areas, increased strength, but these merely indicate some positive action, much like tumor markers and p23 readings.

Yes, something may have happened for the first cohort, but it's way too soon for any legitimate claim of tumor reduction in Phase 1, much less "proven."