Total RNA from tumor cell lines or tissues was isolated with the RNeasy Mini Kit (Qiagen, Germantown, MD, USA), according to the manufacturer’s instructions [18 (link)]. cDNA preparation was conducted according to standard procedures, using M-MLV Reverse Transcriptase (Promega, Madison, WI, USA) and oligo-dT primers (Promega, Madison, WI, USA). Gene expression was measured using the following Taqman gene-specific probes from Thermo Fisher Scientific: NRP-1 (Hs00826128_m1), EGFR (Hs00193306m1), and the housekeepers GAPDH (Hs04420632_g1), and β -actin (Hs99999903_m1) [19 (link)].
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