HLA-DRB1 and sarcopenia: Some HLA types were protective for sarcopenia: increasing copies of DQB1*06:02, DRB5*01:01, and DRB1*15:01 were all associated with reduced likelihood of sarcopenia, and have previously been implicated in a number of studies in the development of multiple sclerosis (6), although mainly as part of an extended haplotype including all three types.