Incidence rates and proportional distribution of HL subtypes by CD4 count at onset of AIDS. (A) Incidence rates of all HL and subtypes. (B) Proportion distribution including those not otherwise specified (NOS). NS indicates nodular sclerosing; MC, mixed cellularity; LD, lymphocyte depleted. 3 HLs with old histology classifications were not included in subtype analyses but were included in the All HL analysis because they had CD4 counts in the AIDS onset period (1 with 150-199 and 2 with ≥ 200 cells/μL).