Immunological evaluation of 15 children with non-Hodgkin lymphoma.

In the present study, 15 children with non-Hodgkin lymphoma have been immunologically evaluated by the following parameters on peripheral blood (PB) lymphocytes: phytohemagglutinin responsiveness (PHA-r); non-immune rosette formation with sheep red blood cells (RF-L) as T-cell marker; presence of surface immunoglobulins (sIg-L) as B-cell marker; serum immunoglobulins levels (IgA, IgM, IgG). Our patients (pts) have been divided in two groups: the first one includes 10 children without PB involvement; the second one includes 5 pts with bone-marrow and PB invasion. From our data it appears that: 1) the majority of pts of the first group presented normal values of membrane markers; PHA-r was impaired in 4/8 pts; 2) in pts with PB invasion absolute number of B and "null" cells was always abnormal and PHA-r altered; 3) in the second group of pts, a "null" cell origin can be suggested by the high percentage and absolute number of cells without surface markers. In our opinion, the high incidence of "null" cells represents the most relevant question: whether they are cells deprived of specific markers, or endowed with markers not identifiable by our current techniques, remains to be established.