SCGB2A2 and neoplasm: This may explain why patients with high tumor fraction (>1%) but no expression of FABP7 in matched tissue did not show detectable levels of FABP7 in plasma (see samples BrCa31, BrCa44, BrCa3, and BrCa19 in Fig. 5a) and why patients with lower tumor fractions but high tumor tissue expression of SCGB2A2 showed detectable levels of SCGB2A2 in plasma (see samples BrCa9, BrCa27, and BrCa40 in Fig. 5b).