VEGFA and neoplasm: According to our oxygen measurements, both the FGF8b and mock tumours were hypoxic, showing pO2 values of 2.3 ± 0.6 mmHg and 1.3 ± 0.3 mmHg, respectively, whereas VEGF tumours were well oxygenated (17.4 ± 2.2 mmHg).