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Gold/Mining/Energy : Vasogen-- VAS on TSE -- Ignore unavailable to you. Want to Upgrade?

To: Done, gone. who wrote (364)	9/6/2006 9:09:27 PM
From: Pluvia	Read Replies (1) \| Respond to of 377

1. likely not data mining - BECAUSE 2. they were pre-determined subgroups AND 3. p values, number of events and number of patients in the subgroup point to real results; SPECIFICALLY * 39% reduction in risk of death or first cardiovascular hospitalization in treated Class II heart failure patients (patients=689; events=216; p=.0003) This next one may be accused of data mining, [not pre-defined subgroup] but the number of patients and p values are excellent. Results look real. Note: these results took place over 500 days; this further supports real data. * 72% of treated patients with no prior history of heart attack experienced a statistically significant reduction in risk of death or cardiovascular hospitalization (patients=1747; events=560 p=.005) >>> What they are doing is called data mining. They are looking through the various subgroups of a trial that failed to meet the primary endpoint. If you have a good knowledge of statistics, you will understand why this is a questionable technique, and why the FDA very seldom accepts this kind of analysis. If you look hard enough, you will usually be able to find some group in a trial that has 'good' results. The number of possible subgroups is huge (male/female, young/old, very ill/less ill, smokers/nonsmokers, the list is almost endless). The likelihood is very high that by random chance, there will be some subgroup that shows a 'positive' result. If you do not understand this, you don't have a good appreciation of what VAS is doing here.