The Predominance of M2-Polarized Macrophages in the Stroma of Low-Hypoxic Bladder Tumors Is Associated with Bcg Immunotherapy Failure11The First Author Has a Phd Grant (Sfrh/Bd/43399/2008) and J.a.f. Has a Postdoctoral Grant (Sfrh/Bpd/66288/2009) from Fct—Fundação Para a Ciência e Tecnologia, Co-Financed by European Social Fund (Esf) Under Human Potential Operation Programme (Poph) from National Strategic Reference Framework (Nsrf). We Thank to Lpcc, Portuguese League Against Cancer (Nrnorte) for Their Support. This Work Was Also Supported by Fundação Para a Ciência e a Tecnologia (Fct, Portugal), European Union, Qren, Feder and Compete for Funding the Qopna Research Unit (Project Pest-C/Qui/Ui0062/2013).2Both Authors Have Equally Contributed to the Work.