What is the key biomarker of HT1 metabolic control?

Plasma and urine succinylacetone is pathognomonic for HT1; undetectable levels on nitisinone indicate good biochemical control and reduced HCC risk.

How does nitisinone prevent hepatocellular carcinoma in HT1?

Nitisinone prevents succinylacetone formation by blocking HPPD; succinylacetone is the proximate carcinogen causing DNA damage, so normalization reduces HCC risk dramatically.

What AFP levels warrant liver imaging in HT1?

AFP rise >100 ng/mL or doubling of AFP over 3 months on adequate nitisinone therapy should prompt urgent liver MRI to rule out HCC development.

What dietary modifications are needed with nitisinone?

Tyrosine and phenylalanine restriction (low-protein diet with metabolic formula) is required on nitisinone to prevent plasma tyrosine toxicity (corneal deposits, peripheral neuropathy).

When is liver transplantation indicated in HT1?

Transplant is indicated for confirmed HCC, decompensated cirrhosis, poor nitisinone response, or intractable porphyria-like crises; nitisinone has dramatically reduced transplant rates.

Hereditary Tyrosinemia Type 1 Treatment Monitor

Monitors hereditary tyrosinemia type 1 treatment response with plasma succinylacetone levels, AFP, liver function, and renal tubular function on nitisinone therapy.

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Frequently Asked Questions

What is the key biomarker of HT1 metabolic control?

How does nitisinone prevent hepatocellular carcinoma in HT1?

What AFP levels warrant liver imaging in HT1?

What dietary modifications are needed with nitisinone?

When is liver transplantation indicated in HT1?