| 1. | Acquired Immunodeficiency Syndrome (246 recruiting studies) |
| 2. | Agammaglobulinemia (1 recruiting study) |
| 3. | AIDS Dementia Complex (2 recruiting studies) |
| 4. | AIDS-Associated Nephropathy (2 recruiting studies) |
| 5. | AIDS-Related Complex (1 recruiting study) |
| 6. | AIDS-Related Opportunistic Infections (3 recruiting studies) |
| 7. | Anemia, Hemolytic, Autoimmune (1 recruiting study) |
| 8. | Antiphospholipid Syndrome (1 recruiting study) |
| 9. | Arthritis, Juvenile Rheumatoid (9 recruiting studies) |
| 10. | Arthritis, Rheumatoid (40 recruiting studies) |
| 11. | Asthma (24 recruiting studies) |
| 12. | Autoimmune Diseases (92 recruiting studies) |
| 13. | Autoimmune Diseases of the Nervous System (23 recruiting studies) |
| 14. | Autoimmune Lymphoproliferative Syndrome (3 recruiting studies) |
| 15. | Burkitt Lymphoma (88 recruiting studies) |
| 16. | Chediak-Higashi Syndrome (3 recruiting studies) |
| 17. | Chronic Neutropenia (2 recruiting studies) |
| 18. | Common Variable Immunodeficiency (3 recruiting studies) |
| 19. | Cryoglobulinemia (1 recruiting study) |
| 20. | Deltaretrovirus Infections (12 recruiting studies) |
| 21. | Demyelinating Autoimmune Diseases, CNS (18 recruiting studies) |
| 22. | Diabetes Mellitus, Type I (10 recruiting studies) |
| 23. | DiGeorge Syndrome (2 recruiting studies) |
| 24. | Evan's Syndrome (1 recruiting study) |
| 25. | Glomerulonephritis, Membranous (2 recruiting studies) |
| 26. | Graft vs Host Disease (42 recruiting studies) |
| 27. | Granulomatous Disease, Chronic (6 recruiting studies) |
| 28. | Guillain-Barre Syndrome (1 recruiting study) |
| 29. | HIV Infections (219 recruiting studies) |
| 30. | HIV Seropositivity (5 recruiting studies) |
| 31. | HIV-Associated Lipodystrophy Syndrome (1 recruiting study) |
| 32. | Hodgkin Disease (98 recruiting studies) |
| 33. | HTLV-I Infections (12 recruiting studies) |
| 34. | Hypersensitivity (32 recruiting studies) |
| 35. | Hypersensitivity, Delayed (5 recruiting studies) |
| 36. | Hypersensitivity, Immediate (31 recruiting studies) |
| 37. | Immune Complex Diseases (1 recruiting study) |
| 38. | Immunoblastic Lymphadenopathy (27 recruiting studies) |
| 39. | Immunologic Deficiency Syndromes (256 recruiting studies) |
| 40. | Immunologic Diseases (843 recruiting studies) |
| 41. | Immunoproliferative Disorders (457 recruiting studies) |
| 42. | Infectious Mononucleosis (1 recruiting study) |
| 43. | Job's Syndrome (6 recruiting studies) |
| 44. | Leukemia, Hairy Cell (16 recruiting studies) |
| 45. | Leukemia, Lymphocytic (184 recruiting studies) |
| 46. | Leukemia, Myelocytic, Acute (150 recruiting studies) |
| 47. | Leukemia, Myeloid (207 recruiting studies) |
| 48. | Leukemia, Nonlymphocytic, Acute (24 recruiting studies) |
| 49. | Leukemia-Lymphoma, T-Cell, Acute, HTLV-I-Associated (33 recruiting studies) |
| 50. | Leukocyte-Adhesion Deficiency Syndrome (1 recruiting study) |
| 51. | Lupus Erythematosus, Systemic (17 recruiting studies) |
| 52. | Lupus Nephritis (4 recruiting studies) |
| 53. | Lymphangiomyoma (1 recruiting study) |
| 54. | Lymphangiomyomatosis (2 recruiting studies) |
| 55. | Lymphoma (393 recruiting studies) |
| 56. | Lymphoma, AIDS-Related (8 recruiting studies) |
| 57. | Lymphoma, B-Cell (113 recruiting studies) |
| 58. | Lymphoma, Diffuse (54 recruiting studies) |
| 59. | Lymphoma, Follicular (129 recruiting studies) |
| 60. | Lymphoma, High-Grade (24 recruiting studies) |
| 61. | Lymphoma, Intermediate-Grade (31 recruiting studies) |
| 62. | Lymphoma, Large-Cell (148 recruiting studies) |
| 63. | Lymphoma, Large-Cell, Diffuse (125 recruiting studies) |
| 64. | Lymphoma, Large-Cell, Follicular (110 recruiting studies) |
| 65. | Lymphoma, Large-Cell, Immunoblastic (89 recruiting studies) |
| 66. | Lymphoma, Large-Cell, Ki-1 (42 recruiting studies) |
| 67. | Lymphoma, Low-Grade (16 recruiting studies) |
| 68. | Lymphoma, Lymphoblastic (93 recruiting studies) |
| 69. | Lymphoma, Mantle-Cell (108 recruiting studies) |
| 70. | Lymphoma, Mixed-Cell (92 recruiting studies) |
| 71. | Lymphoma, Mixed-Cell, Diffuse (90 recruiting studies) |
| 72. | Lymphoma, Mixed-Cell, Follicular (111 recruiting studies) |
| 73. | Lymphoma, Mucosa-Associated Lymphoid Tissue (86 recruiting studies) |
| 74. | Lymphoma, Non-Hodgkin (234 recruiting studies) |
| 75. | Lymphoma, Small Cleaved-Cell, Diffuse (91 recruiting studies) |
| 76. | Lymphoma, Small Cleaved-Cell, Follicular (111 recruiting studies) |
| 77. | Lymphoma, Small Lymphocytic (109 recruiting studies) |
| 78. | Lymphoma, Small Noncleaved-Cell (49 recruiting studies) |
| 79. | Lymphoma, Small-Cell (109 recruiting studies) |
| 80. | Lymphoma, T-Cell (108 recruiting studies) |
| 81. | Lymphoma, T-Cell, Cutaneous (80 recruiting studies) |
| 82. | Lymphoma, T-Cell, Peripheral (4 recruiting studies) |
| 83. | Lymphoma, Undifferentiated (38 recruiting studies) |
| 84. | Lymphopenia (3 recruiting studies) |
| 85. | Lymphoproliferative Disorders (463 recruiting studies) |
| 86. | Monoclonal Gammopathy of Undetermined Significance (3 recruiting studies) |
| 87. | Multiple Myeloma (100 recruiting studies) |
| 88. | Multiple Sclerosis (19 recruiting studies) |
| 89. | Multiple Sclerosis, Chronic Progressive (2 recruiting studies) |
| 90. | Multiple Sclerosis, Relapsing-Remitting (4 recruiting studies) |
| 91. | Myasthenia Gravis (1 recruiting study) |
| 92. | Mycosis Fungoides (54 recruiting studies) |
| 93. | Paraproteinemias (58 recruiting studies) |
| 94. | Pemphigus (1 recruiting study) |
| 95. | Phagocyte Bactericidal Dysfunction (10 recruiting studies) |
| 96. | Plasmacytoma (93 recruiting studies) |
| 97. | Polyradiculoneuropathy (2 recruiting studies) |
| 98. | Purpura, Thrombocytopenic (3 recruiting studies) |
| 99. | Respiratory Hypersensitivity (25 recruiting studies) |
| 100. | Reticuloendotheliosis (36 recruiting studies) |
| 101. | Rhinitis, Allergic, Perennial (1 recruiting study) |
| 102. | Secondary Acute Myeloid Leukemia (49 recruiting studies) |
| 103. | Severe Combined Immunodeficiency (7 recruiting studies) |
| 104. | Sezary Syndrome (50 recruiting studies) |
| 105. | Sjogren's Syndrome (4 recruiting studies) |
| 106. | Spondylitis, Ankylosing (5 recruiting studies) |
| 107. | Stiff-Person Syndrome (2 recruiting studies) |
| 108. | Temporal Arteritis (1 recruiting study) |
| 109. | Urticaria (4 recruiting studies) |
| 110. | Vasculitis, Central Nervous System (1 recruiting study) |
| 111. | Vasculitis, Hypersensitivity (1 recruiting study) |
| 112. | Waldenstrom Macroglobulinemia (34 recruiting studies) |
| 113. | Wiskott-Aldrich Syndrome (3 recruiting studies) |
