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Dancing in the dark

02/01/16 12:00 PM

#70795 RE: everyonesguess #70794

intriguing ...

BioChica

02/01/16 12:02 PM

#70796 RE: everyonesguess #70794

Options players aren't even thinking about February, more like March. Might be a good sign for February news, options players seem to jinx us.

BioChica

02/01/16 12:07 PM

#70797 RE: everyonesguess #70794

Has anyone continued a cardiovascular trial that the DMC deemed a success?

marzan

02/01/16 12:09 PM

#70798 RE: everyonesguess #70794

looks very reasonable and sounds possible!

sts66

02/01/16 12:16 PM

#70799 RE: everyonesguess #70794

if p<0.05 is proven by INTERIM, FREDUCE-IT "tentative success"can be announced (instead to announcing "completion"), and ANCHOR label expansion should be preliminarily granted




IIRC, we need p < 0.0073 at interim to provide p < 0.05 at final. There is no such thing as "tentative success" - it's a black and white yes or no to continue or halt. ANCHOR is off the table, this has been discussed to death - R-IT != ANCHOR - TG 150-499 vs. TG 200-499.

rafunrafun

02/01/16 12:38 PM

#70808 RE: everyonesguess #70794

I brought up two potential problems that I see happening the scenario of both arms being put on V after interim analysis. At interim, DMC will compare the total of events in V group, let's call it (A) vs Placebo group, let's call it (B). If the rate of (B) = 5.0 and the rate is (A) is 4.0, RRR = 20%.

If what you predict occurs and both groups are given V, this will form a new group, let's call it (C). I don't understand how RRR AFTER interim could be calculated.

DMC compared (A) to (B) to calculate RRR before. Now we will have (C). The only way to calculate RRR after we have (C) is to compare (C) to (B) but I see problems which will lead to inaccuracies:

- Population in (C) will be older than in (B). So when comparing the two, it's not fair to AMRN because (C) will be compared to a younger population.

- One can say that population in (C) is much healthier than in (B) because no one in (C) has gotten an event thus far. I understand population is chosen randomly, but what's not random is that everyone in (C) did not have an event, so it's not a fair comparison to (B).