Percentage of IPCs and CD4⁺ T cells in HIV-infected subjects at different clinical stages.

The clinical status, IPC, and CD4⁺ T-cell count of each subject are indicated. Subject 1 (healthy) and subject 3 (progressor) have comparable percentage and number of IPCs (0.32%, 6.5 cells/μL versus 0.26%, 5 cells/μL) and T cells (26.4%, 502 cells/μL versus 18.6%, 342 cells/μL). Subject 2 (LTS) has a very high IPC percentage and number (1.28%, 28.8 cells/μL). Subject 4 (AIDS with opportunistic Pneumocystis carinii infection) has undetectable IPCs and very low CD4⁺ T cells (2.8%, 27 cells/μL). Subject 5 who was diagnosed as AIDS because of very low CD4⁺ T cells (0.74%, 12 cells/μL) has conserved IPCs (0.3%, 4.7 cells/μL) and no AIDS-related disease. Subject 6 (AIDS with active Kaposi sarcoma) has low IPCs (0.01%, 0.3 cells/μL) but normal CD4 T cells (14.3%, 438 cells/μL). Subject 7 (had a history of Kaposi sarcoma but had been in complete tumor remission for the past 7 years) has both conserved IPC number (0.25%, 4.85 cells/μL) and CD4⁺ T cells (13.8%, 258 cells/μL).