Cloning of Lewis lung carcinoma cells in agar cultures in diffusion chambers

A method was developed for cloning the Lewis lung carcinoma cells (LLC) in vivo in diffusion chambers. This method is analogous to the system introduced by Gordon for cloning hemopoietic precursor cells. No significant differences were observed in the efficiency of the cloning of the tumour cells within the range of 1 to 4 weeks after transplantation (7.7 +/- 0.7% for 240 cultures).