H
HTLV

Human T-cell lymphotropic virus

Human cells, tissues, or cellular or tissue-based products (HCT/Ps)

Articles containing or consisting of human cells or tissues that are intended for implantation, transplantation, infusion, or transfer into a human recipient.  Note this is the term preferred by FDA, FACT and other accreditation organizations prefer the term cellular therapy product.

Human Leukocyte Antigens (HLA)

The HLA system is comprised of a series of genes grossly divided into Class I and Class II HLA.  Class I heavy chain genes are coded for at the highly polymorphic HLA-A, HLA-B and HLA-C loci and are found on the surface of nearly all human cells in association with a non-polymorphic light chain called beta-2 microglobulin.  Class II heavy and light chains are encoded at the HLA-DR, HLA-DQ, and HLA-DP loci.  HLA-DR includes polymorphic genes at DRB1, DRB3, DRB4, and DRB5 loci, while the DR-alpha chain has limited polymorphism.  HLA polymorphism may be identified by antibodies (Serologic level), by T cells (Cellular level) or at the level of DNA (Molecularly defined).  Molecular definition gives the highest level of resolution while cellular recognition may be more clinically relevant.  Antigens of the HLA system may be the target of cells causing GVHD, GVL, or graft rejection.

Human Tissue

Any organ, organ sample or specimen obtained from a living or cadaveric human donor.

Hydroxyethyl starch (HES)

Chemical applied for the separation of leukocytes within whole blood components.  Reduces the surface tension of red blood cells causing them to stack up (Rouleaux) and sediment at a rapid rate resulting in the enrichment of leukocytes in the liquid layer.

I
IDE

Investigational device exemption

Ig

Immunoglobulin

IL-2

Interleukin-2

Immunocompetent

The ability of an individual to mount a normal immune response to foreign antigens.

In vitro

Tissue culture or testing of cells outside the individual from which they were obtained; within a receptacle, such as a test tube.

In vivo

Application or testing within the living body.

Incompatibility, major

ABO incompatibility such that the recipient of a graft possesses antibodies reactive to the red blood cells of the donor.  Antibodies commonly found in the plasma of individuals of a given blood type are:

Blood Type           Antibody
Group A                 Anti-B
Group B                 Anti-A
Group AB              none
Group O                 Anti-A and Anti-B

Incompatibility, minor

ABO incompatibility such that the donor of a graft (transfusion) has antibodies reactive against recipient red blood cells. 

Blood Type           Antibody
Group A                 Anti-B
Group B                 Anti-A
Group AB              none
Group O                 Anti-A and Anti-B

IND

Investigational New Drug

Ineligible

A cellular therapy product donor who does not meet all donor screening and testing requirements related to transmission of infectious disease as defined by the U.S. Food and Drug Administration, or non-U.S. equivalent.

Infectious Disease Testing Results

Antibody to:

Human Immunodeficiency Virus 1 (HIV 1)
Human Immunodeficiency Virus 2 (HIV 2)
Human T cell Leukemia Virus (HTLV)
Hepatitis C Virus (HCV)
Syphilis
WNV

Antigen from:

Human Immunodeficiency Virus (HIV Ag)
Hepatitis B Surface Antigen (Hbs Ag)
Hepatitis B Core (Hbc)
Cytomegalovirus (CMV)

DNA of:

Human Immunodeficiency Virus (NAT-HIV)
Hepatitis C Virus (NAT-HCV)

Institutional Review Board (IRB)

A Board or Committee established by an institution in accordance with the regulations of the United States Department of Health and Human Services, or other governmental agency where applicable, to review biomedical and behavioral research involving human subjects conducted at or supported by that institution.

Interleukin-2 (IL-2)

Cytokine released by subpopulation of T-lymphocytes capable of stimulating itself or other T cells or Natural Killer cells to proliferate and increase functional activity.

Inverted microscope

Microscope with inverted lens mounted such that objects are viewed from the bottom of the vessel up.  In the laboratory used to score hematopoietic colony assays and T cell limiting dilution cultures.

IRB

Institutional review board