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SMITH, Williams, Lowery and Keppie (1968) described the production of two sublines of an AKR mouse lymphoma (K12(A) and K12(V)) with differing malignancy. The sublines were derived by tumour progression during passage of a newly isolated spontaneous lymphoma (K12). The cells of the 6th passage constituted the subline of low malignancy (K12(A)) and those of the 14th passage constituted the subline of high malignancy (K12(V)). This paper describes studies of the intraperitoneal growth and the blood and visceral invasion of the two sublines. Such studies have been made with individual mouse tumours (Revesz and Klein, 1954; Wheatley and Ambrose, 1964; Lala and Patt, 1966) but not, as far as the authors are aware, with pairs of closely related sublines of differing malignancy.

The behaviour in AKR mice of lymphoma sublines of low and high malignancy