CPT1B and narcolepsy: In contrast, CPT1B and CHKB, which are reportedly associated with narcolepsy with cataplexy in a Japanese population (Miyagawa et al., 2008), are also reportedly associated with both HLA-DQB1*06:02-positive EHS and EHS in patients lacking HLA-DQB1*06:02 (designated here as HLA-DQB1*06:02-negative EHS) (Miyagawa et al., 2009).