EGFR and neoplasm: EGFR mutant mice fed with doxycycline food for 30 days and receiving vehicle liposomes presented a dramatic increase in tumor burden compared with control animals which did not express mutant EGFR, shown by increased lung weight (Figure 1B), increased number of nuclei/mm2 (Figure 1C) or micro‐CT scan of the entire lung (Figure 1D).