Group like this but for cancer?

I have found this site very helpful in that it's basically user based and user driven.  I am looking for a similar group for cancer patients.  Everything I find is dr's, care centers, pharma, psycology, or societies/professional organizations all drven, mediated, or otherwise led by professionals in their fields.  That's all well and good but I'm looking specifically for how people handled Rituximab chemo treatment from a patient perspective.  No, I don't have cancer, but I do have a rate blood disorder and this is the only fairly successful treatment.  Any pointers in the right direction would be appreciated but suggested of american cancer society and such other professional groups are not what I'm looking for.

Thank you for any help!