The most extensively studied model of plasmacytomagenesis is the induction of plasmacytomas in BALB/c mice by i.p. injections of mineral oil or, chemically more defined, by several branched alkanes such as pristane (2.6.10.14-tetramethylpentadecane), phytane (2.6.10.14-tetramethylhexadecane), and