I admit I do not know any details about the treatment in Cologne or Dr Gorter. I noticed that as of 2012 it shows that over 5000 patients were treated (1500 additional patients since 2 years prior).
I did also come across this website with some testimonials (incl english undertitles):
By the way, a fund raising effort is underway for 33 year old Kristen, who has current brain tumor diagnosis and is hoping to get enough funds for dendritic cell vaccination in Germany. I sent her an email to inform her of DCVax-L being available in Germany under Hospital Exemption, and suggested she might want to make contact with NWBO to inquire & get info. Feel free to donate on her website: www.gofundme.com/helpkristennow