Immunotherapy and chemo combo?/Immunotherapy options.

Anybody knows if combining immunotherapy and chemo is a good idea? Would chemo make immunotherapy less effective? Is it better to do chemo first and immunotherapy after that or would doing both at the same time be ok?

So it seems that for DCVax the surgery would have to be done in one UK hospital ,but for other vaccines it can be done at any hospital and storemytumor.com would pick up the tissue.
They gave me few links for clinics which make vaccines from such frozen tumor tissue and offer other immunotherapy options. I am wondering how those compare.
http://www.unifontis.net/en/therapies/cancer-vaccination/.

http://www.hallwang-clinic.com/en.html

http://www.thechristieclinic.co.uk

http://www.ctcicenter.com/prof-slavin-and-team.htm

http://www.perseuspci.com