Therapeutic Antibody Cross Reactivity (TCR)

Therapeutic Antibody Cross Reactivity Testing (TCR)

In 1989 David Fairley was the first in the UK to offer TCR screening studies to GLP quality standards. Histologix presented its interpretation of the TCR “Points to Consider” guidelines to the FDA in 1992 and it is those protocols that have since become universally accepted as the basis for current TCR study designs today.

Antibodies intended for therapeutic clinical use must undergo regulatory screening in human tissue as part of any preclinical safety assessment in line with US FDA, EU and Japanese MAFF regulations.

The Directors at Histologix (David Fairley and Andrew Lawrence) and staff have over 60 years of combined experience in regulatory TCR studies and have successfully optimised IHC assays for a range of novel antibody classes, including; murine, humanised, chimeric, fully human, antibody cocktails, Fab/VH fragments, bispecific superantigens, biomers, tetramers, nanobodies, multispecific nanobodies, aptamers, and variable regions attached to various carrier backbones.

Each type of molecule has its own characteristics and HistologiX has a considerable depth of knowledge of all these therapeutics allowing us to achieve successful TCR outcomes.

Regulatory TCR studies consist of two phases. The first being where the conditions under which the antibody is to be used are optimised and where a working IHC assay is developed using appropriate control material and the second phase comprises of the actual screening of human tissue samples from approximately 38 tissues from 3 donors to cover both FDA and EMA regulatory guidelines.

HistologiX can also offer non-regulatory screening which is useful when trying to identify lead candidate antibodies or clones using reduced numbers of tissues samples or Tissue Micro-Arrays.

Using tissues from animal species and the IHC procedures described it is possible to identify the most appropriate laboratory species in which to undertake preclinical toxicology studies. This is also strongly suggested by the various regulatory authorities.

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