Circulating PDIA4, MMP-2, MMP-9, and Claudin-2 in Vitamin D-Deficient Patients with Brain Tumors: An Exploratory Clinical Pilot Study
Background/Objectives: Extracellular matrix remodeling, cellular stress responses, and blood–brain/blood–tumor barrier-related alterations are important processes involved in brain tumor biology. This exploratory cross-sectional pilot study evaluated circulating circulating protein disulfide isomerase A4 (PDIA4), matri...