PLAUR and neoplasm: The subdivision of patients according to tumor location into supraglottic (mean serum level uPAR 6.395 ng/mL), glottic (mean serum level uPAR 5.437 ng/mL) and a group with at least two affected locations (mean serum level uPAR 5.402 ng/mL) yielded no statistically significant results.