Mouse xenografts were established with subcutaneous injection of 1.7 × 106 control (shCont) or ILEI KD (sh506) NCI-H1993 and NCI-H441 cells into 8–12-week old female SCID mice (n = 4). Injected mice were distributed into randomized cohorts and vehicle and compound treatment started as the mean tumor size reached 100 mm3. Crizotinib (LC Laboratories) was applied orally (50 mg/kg, dissolved in 5% DMSO, 10% ethanol and 10% Cremophor) in a 5-days treatment 2-days pause protocol. For NCI-H1993 tumors, at the time point of sacrifice of vehicle-treated mice, crizotinib treated animals were monitored for an additional 11 days without further supply of the compound. Tumors were measured regularly by a caliper and tumor volume was calculated by the formula a x b2 / 2 (a for the major and b for the minor tumor diameter). The tumors were dissected, and tumor mass was determined 40–50 days after injection.
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