The relative copy number for PlGF in 21 samples of lung cancer tissue ranged from 0.52 to 1.19, with a mean ± standard deviation (SD) of 0.95 ± 0.20, while the corresponding values in the matched non tumours lung tissue ranged from 0.21 to 1.00, with a mean ± SD of 0.57 ± 0.24. The gene discussed is PGF; the disease is lung cancer.