You do not understand how a conflict of interest is defined.
You just guessed “probably” what involvement 70 investigators in the trial had. Nobody cares about your guesses.
The number of patients at a site is irrelevant to authorship.
Patient level data is tabulated in the JAMA article.
Dr. Stupp is a proponent of the Optune helmet, whose data sucked. Even Dr. Stupp would not sign on to Novocure’s claims as their later articles trended more and more manipulated. Dr. Stupp is a proponent of Optune and Temodar for GBM, both result in a true survival of only about 3% at five years, but he extrapolated data from two years out to five years out to pretend he had 12% survival in the Optune trial (more likely 3% survival) but then hid the data. Follow up was discontinued after two years from last patient enrolled because survival curve was degrading.