[Cytometry] Rare Event Analysis

Carl Simard carl_jf_simard at hotmail.com
Thu Nov 5 10:46:04 EST 2009

If your main problem is the size of the data file, is it possible for you to save only the events in the IFNg+ gate ? I don't know which system you have, but sa far as I know, all acquisition software have the option to let save gated events instead of saving all events...


As for the number of cells needed for statiscally significant results, there's no universally defined line. It really depends on the experiment, on what you want to demonstrate, on the reproducibility of the experiement, on the difference between your experimental sample and your control, etc... Sometime, a few highly positive and highly reproducible events may be more significative than a large number of events barely positive and in an experiment not showing any difference with the control in half of the repetition...


> From: elizabkr at BaylorHealth.edu
> To: cytometry at flowcyt.cyto.purdue.edu
> Date: Wed, 4 Nov 2009 10:20:45 -0600
> Subject: [Cytometry] Rare Event Analysis
> A number of users in our Core Facility are phenotyping rare events. They start with PBMCs --> Lymphs --> Live Cells --> CD3+ --> CD4+ or CD8+ --> IFNg+ --> subset of interest. The IFNg+ subset is typically <1% of the total. Are the any guidelines to suggest what number of cells should be collected so that the results are statistically significant?
> The files are getting larger and more difficult to manage from a data storage/transfer standpoint. Any thoughts or suggestions would be appreciated.
> Thanks!
> Elizabeth
> Elizabeth T. Kowalski
> Mgr., Flow Cytometry Core Facility
> Baylor Institute for Immunology Research
> 3434 Live Oak St. Suite 200.1
> Dallas, TX 75204
> 214/820-3586
> elizabkr at bhcs.com
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