The three human non-Hodgkin lymphoma xenografts with different morphological appearance (lymphoblastic, centroblastic, centrocytic) had many common pheno- and genotypic features positivity of B-cell markers, 14q+ chromosomal abnormality, etc.). Furthermore, two lines (HT 58 and 130) expressed lambda light chain monoclonally. The third line (HT 117) showed bigenotypic rearrangement of light genes. A set of new anti-proteoglycan markers, especially anti-chondroitin sulfate mAbs made possible to individualize the xenografts.