Which enzyme is increased in persons with prostate and small-cell lung cancer?

Which enzyme is increased in persons with prostate and small-cell lung cancer?

• A. Creatine kinase-1 (CK-1)
• B. Gamma glutamyl transferase (GGT)
• C. Amylase
• D. Lactate dehydrogenase

Answer: (D)

Lactate dehydrogenase (LDH) is an enzyme that catalyzes the conversion of lactate to pyruvate in the presence of NAD+, playing a crucial role in cellular energy production through anaerobic metabolism. Increased levels of LDH are commonly associated with tissue damage or disease, as it is released into the bloodstream when cells are damaged or destroyed.

In patients with prostate cancer and small-cell lung cancer, elevated LDH levels can indicate tumor burden or metastasis. The enzyme is not tumor-specific, but its elevation can provide insights into the severity of the disease and the extent of tissue involvement. The presence of an elevated LDH can serve as a prognostic marker, helping healthcare providers assess the disease's progress or response to treatment.

In contrast to LDH, the other enzymes listed do not have the same association with these types of cancers. Creatine kinase-1 is more related to muscle damage and heart issues, gamma glutamyl transferase is often linked to liver function, and amylase is associated with pancreatic function. Thus, the elevation of LDH specifically in the context of prostate and small-cell lung cancer positions it as a relevant marker for these conditions.