NRP1 and neoplasm: Recently, we reported the identification and characterization of a panel of homing peptides that target tumor ECM: a peptide that binds to TNC-C and Fn-EDB (PL1 peptide) [16], to Fn-EDB and neuropilin-1 (NRP-1) (PL2 peptide) [17], and to TNC-C and NRP-1 (PL3 peptide) [18].