The Purpose Of This Contract Is To Carry Out Proteome Analysis From Serum Samples Of Hiv Patients Treated With Metformin Or Placebo For The Aids And Infectious Diseases Research Group Of The Foundation For Biomedical Research Of The La Paz University Hospital (Hereinafter, Fibhulp). The Acquisition Of This Service Will Facilitate The Execution Of The Isciii Project Ici20/00043 And Awarded To Dr. José Ramón Arribas López As Principal Investigator.