The tumor cells were injected subcutaneously into the backs of 4–5-week-old female Balb/c nude mice. The xenograft tumor size was measured every 3 days and the tumor volume was determined as (lengthxwidth2)/2. When tumors grew to 50 mm3, mice were randomized to the following groups: vehicle (DMSO), gefitinib (5 mg/kg), or N19 (5 mg/kg). Drugs were administered by intraperitoneal injection every 3 days.
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