ACE and synovial sarcoma: Furthermore, some recent studies show that certain biomarkers obtained from routine blood tests, such as lactate dehydrogenase (LDH), angiotensin‐converting enzyme (ACE), fibrinogen, and various cellular ratios, which are related to the chronic inflammatory state found in these patients even years after exposure cessation, could aid in distinguishing patients with simple silicosis (SS) from healthy subjects.26