Patients with chronic lymphoedema are prone to develop chronic infecti
ons and various tumours in the lymphoedematous limb, suggesting that r
egional immune surveillance is impaired. To test the hypothesis that c
utaneous cell-mediated immunity is impaired, 35 women with postmastect
omy lymphoedema were investigated using dinitrochlorobenzene to test t
he afferent and efferent loops of the allergic contact immune response
, The results support the role of lymphatics as an important component
of the immune response to allergens by the demonstration of impairmen
t of both the afferent and efferent loops of the allergic contact derm
atitis reaction, and confirm that there is suppression of immune compe
tence in a lymphoedematous limb.