LMTK3 and neoplasm: However, in the presence of doxorubicin, the tumor growth inhibition was reduced in the MCF7/LMTK3 group (P = 0.0022) compared to the MCF7 one (P < 0.0001) (Figs. 1c, d and Supplementary Figure 2), data that were in line with our in vitro results above.