To identify cell lines lacking endogenous LRP1B expression, NSCLC cell lines were tested for the presence of LRP1B transcripts using a sensitive quantitative RT-PCR (qPCR) with primers specific for human LRP1B. HEK 293 cells, which have been previously shown to express endogenous LRP1B [22], served as positive control. Here, LRP1B is linked to non-small cell lung carcinoma.