RRP1B and neoplasm: Average tumor weight was 240 mg ± 200 mg for the Rrp1b clones compared to 600 mg ± 270 mg for the β-galactosidase clone (p < 0.001) (Figure 3A), and average lung surface metastasis count being 5.7 ± 6.0 for the Rrp1b clones compared to 12.6 ± 8.4 for the β-galactosidase clone (p = 0.010) (Figure 3B).