Alkaline phosphatases in neoplastic diseases.

Area of Science:

• Clinical Biochemistry
• Oncology
• Medical Diagnostics

Background:

• Alkaline phosphatase (ALP) is an enzyme found in various tissues, with elevated levels often indicating disease.
• Liver and bone isoenzymes of ALP are key indicators for diagnosing and monitoring conditions affecting these organs, particularly cancer metastasis.
• Thermostable variants of ALP may serve as additional biomarkers for specific malignancies.

Purpose of the Study:

• To evaluate the diagnostic utility of liver and bone serum alkaline phosphatase isoenzymes in patients with suspected neoplastic metastases.
• To investigate the prevalence and significance of thermostable serum alkaline phosphatase variants in cancer patients.
• To correlate findings with other clinical markers, such as alpha-1 fetoprotein.

Main Methods:

• Assay of liver and bone serum alkaline phosphatase isoenzyme activity.
• Evaluation of thermostable serum alkaline phosphatase variants in a cohort of 136 patients.
• Correlation of isoenzyme findings with clinical data, laboratory results, gamma-radiography, radionuclear imaging, and alpha-1 fetoprotein levels.

Main Results:

• High concordance between serum alkaline phosphatase isoenzyme activity and clinical/radiographic findings for liver (62/62 patients) and bone (36/38 patients) metastases.
• Bone isoenzyme determination showed agreement with radionuclear findings in 27/30 patients.
• Thermostable variants were identified in 8/40 lung carcinoma patients and 8/13 primary hepatocellular carcinoma patients; one case of Nagao isoenzyme in stomach carcinoma was noted.

Conclusions:

• Serum alkaline phosphatase isoenzyme analysis is a reliable method for detecting liver and bone metastases.
• Thermostable ALP variants may be associated with specific types of cancer, including lung, liver, and stomach carcinomas.
• Further research into thermostable ALP variants could enhance cancer diagnostic strategies.