. >>> joining me now is bridget reynolds, a nurse practitioner who has upped clinical trials at med star how big a deal is this? >> i think this is a big deal to have stability over a three year period of potentially new treatment for alzheimer's disease is very encouraging. >> these people are not getting worse for three years time but this is only four people. >> correct. very small number of people in the trial. >> but more of them are being studied, including at georgetown. >> yes. there is an ongoing study of close to 400 subjects nationwide. and we anticipate the results of that study in 2013. >> but in the study, people get it in an iv and this immune treatment focuses on these plaques in the brain. is that right? >> yes. it's designed to remove plaque in the brains of people with alzheimer's disease. >> is that what they think makes the memory so bad? >> yes. it's what we think leads to memory loss and cognitive decline. >> when people see the story like we have seen today of this woman who did not get worse for three years, you know they're going to be many people out there look