lymphocyte clones. Whereas in three patients, the two S.Ig markers differed
in both their heavy and light chains, both S.Ig markers shared A light chains
in the two other patients with biclonal proliferation. This finding suggests
that the two proliferating clones could have been derived from a common
clone. This situation is similar to that observed in some instances of serum
biclonal 1g.37’38 One of these patients was simultaneously affected with
chronic lymphocytic leukemia and multiple myeloma.