Based upon our increasing knowledge of mechanisms underlying tissue de
struction in RA patients, new therapeutic principles have been develop
ed, aimed at blocking proinflammatory cytokines or using antiinflammat
ory cytokines. Both principles, however, have proven to be very effect
ive. In addition, the availability of the methodology to transduce cel
ls with genes has initiated first experiments in animal models to test
whether gene therapy for arthritis is suitable, followed by a first,
very carefully formulated protocol for human RA. Gene therapy for RA h
as to still be considered as an experimental form of therapy in a very
early stage, not allowing even now any serious treatment offer to RA
patients. Several problems, such as the question of a suitable vector
system have not yet been solved. With more experiments this therapeuti
c principle might become available and might prove effective even in a
disease with a systemic character like RA in the coming years.