IGF1 and acute respiratory distress syndrome: Figure 2A shows increased PCP‐III levels in the ELF from FP‐ARDS patients compared to both early ALI/ARDS and controls. Importantly, the protein levels of IGF‐I and PCP‐III in the ELF of FP‐ARDS are significantly correlated versus control individuals (P < 0.01) (Fig. 2B).