MSB 1.02% 99.0¢ mesoblast limited

Cell Therapy News/Articles, page-6519

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    "I will state categorically, that i believe we have a decent chance of an early stop at 45% if we can maintain a 40% differential in mortality with the placebo group. I would deem our treatment a relative failure if we have not stopped at 180 patients or 60% of the enrolled. I follow the science and note how the trial is being powered"

    I think we have evidence from Mesoblast themselves to back up your assertion.

    Remember that the original study size for this trial was 240 patients. So clearly, Mesoblast and/or FDA believed that was a safe size to demonstrate efficacy. Given it was a safe number, we can confidently assume if the study performed as expected, efficacy would be clear at some point prior to reaching the 240 patient enrolment. If we assume the original trial size was designed with a safety buffer of say 30% then we would expect the base case for efficacy to be demonstrated at 240 x 0.7 = 168.

    So, yes it is reasonable to expect overwhelming results at the 60% (180) patient DSMB readout if the efficacy is not a "relative failure".

    The reason for the increase from 240 to 300 is a mystery. So we also need to take that into account.
 
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