Transplantable mouse lymphosarcoma T 86157 (MB) studied in vivo, in vitro and at autopsy.

INTRODUCTION Where exactly round-cell sarcoma, lymphosarcoma, lymphosarcomatosis, leukosarcomatosis, and aleukemic and leukemic lymphadenosis should stand in pathology is still debatable (5, 7, 10, 11, 12,13,18). The answer to this question touches on what cells eventually are the vectors of malig nancy. It is for this reason that it was thought de sirable to submit a number of these tumors to a closer scrutiny. This has been done with two mouse tumors, both anatomically and by means of the tissue culture method. In this paper we will de scribe the first of these tumors.