Head and neck squamous cell carcinoma: Measurement of plasma parathyroid hormone-related protein and serum and urine calcium concentrations

OBJECTIVES: Parathyroid hormone-related protein (PTHrP) is expressed by squ amous cell carcinomas. Our first objective was to examine the stability of PTHrP in normal human plasma. Our second objective was to determine whether plasma PTHrP could be used in patients with head and neck squamous cell ca rcinoma (HNSCC) as an indicator of tumor burden or relapse. STUDY DESIGN AND SETTING: Blood and urine samples from 55 HNSCC patients un dergoing tumor resection at The Ohio State University were measured for pla sma PTHrP (1-86) concentration, serum ionized calcium concentration, and ur ine calcium/creatinine ratio. RESULTS: Two of 55 HNSCC patients had detectable levels of plasma PTHrP Ser um ionized calcium concentrations and urinary calcium/creatinine ratios wer e within normal limits in all patients. CONCLUSIONS: Plasma PTHrP was not a valuable indicator of tumor presence or recurrence in our patient population. SIGNIFICANCE: Plasma PTHrP is not a useful marker of tumor presence or recurrence in patients with stage II to IV or recurrent HNSCC.