Case-Finding and Diagnosis
Identifying MASLD cases in people at risk remains incidental, largely because it is a silent disease and is symptom-free until it becomes severe, said Dr. Gastaldelli.
The guideline recognizes that individuals with type 2 diabetes or obesity with additional metabolic risk factor(s) are at a higher risk for MASLD with fibrosis and progression to MASH.
Assessment strategies for severe liver fibrosis in MASLD include the use of noninvasive tests in people who have cardiometabolic risk factors, abnormal liver enzymes, and/or radiological signs of hepatic steatosis, particularly in the presence of type 2 diabetes or obesity or in the presence of one or more metabolic risk factors.
Dr. Gastaldelli noted that type 2 diabetes, metabolic syndrome, and obesity, including abdominal obesity identified by large waist circumference, are the major risk factors and should be warning signs.
“We need to consider abdominal obesity too — we’ve published data in relatively lean people, body mass index < 25, with MASH but without diabetes. Most of the patients accumulated fat viscerally and in the liver and had hypertriglyceridemia and hypercholesterolemia,” she said.
“The guidelines reflect this because the definition of MASLD includes steatosis plus at least one metabolic factor — waist circumference, for example, which is related to visceral fat, hyperlipidemia, or hyperglycemia. Of note, in both pharmacological and diet-induced weight loss, the decrease in liver fat was associated with the decrease in visceral fat.”
The noninvasive biomarker test, Fibrosis-4 (FIB-4) may be used to assess the risk for liver fibrosis. The FIB-4 index is calculated using a patient’s age and results of three blood tests — aspartate aminotransferase, alanine aminotransferase, and platelet count.
Advanced fibrosis (grade F3-F4) “is a major risk factor for severe outcomes,” said Dr. Gastaldelli. A FIB-4 test result below 1.3 indicates low risk for advanced liver fibrosis, 1.30-2.67 indicates intermediate risk, and above 2.67 indicates high risk.
“When fibrosis increases, then liver enzymes increase and the platelets decrease,” said Dr. Gastaldelli. “It is not a perfect tool, and we need to add in age because at a young age, it is prone to false negatives and when very old — false positives. It’s important to take a global view, especially if the patient has persistent high liver enzymes, but FIB-4 is low.”
“And if they have more than one metabolic risk factor, proceed with more tests, for example, transient elastography,” she advised. Imaging techniques such as transient elastography may rule out or rule in advanced fibrosis, which is predictive of liver-related outcomes.
“However, imaging techniques only diagnose steatosis and fibrosis, and right now, MASH can only be diagnosed with liver biopsy because we do not have any markers of liver inflammation and ballooning. In the future, noninvasive tests based on imaging and blood tests will be used to identify patients with MASH,” she added.
Management of MASLD — Lifestyle and Treatment
“Pharmacological treatments are designed for [patients] with MASH and fibrosis grade F2 or F3, but not MASLD,” Dr. Gastaldelli said. As such, lifestyle interventions are the mainstay of management — including weight loss, dietary changes, physical exercise, and low to no alcohol consumption. “Eating good-quality food and reducing calories are both important because the metabolism responds differently to different nutrients,” Dr. Gastaldelli said.
“In particular, the guidelines advise dietary management because some foods carry liver toxicity, for example, sugary foods with sucrose/fructose especially,” she said, adding that, “complex carbohydrates are less harmful than refined carbohydrates. Processed foods should be avoided if possible because they contain sugars, [as well as] saturated fats and hydrogenated fat, which is particularly bad for the liver. Olive oil is better than butter or margarine, which are rich in saturated fat, and fish and white meat are preferable.”
She added that a diet to help manage type 2 diabetes was not so dissimilar because sugar again needs to be reduced.
If a patient has severe obesity (and MASLD), data show that bariatric surgery is beneficial. “It not only helps weight loss, but it improves liver histology and has been shown to improve or resolve type 2 diabetes and reduce CVD risk. Importantly, regarding fibrosis, nutritional management after the bariatric surgery is the most important thing,” said Dr. Gastaldelli.
Optimal management of comorbidities — including the use of incretin-based therapies such as semaglutide or tirzepatide for type 2 diabetes or obesity, if indicated — is advised, according to the guidelines.
Glucagon-like peptide 1 receptor agonists (GLP-1 RAs) have been shown to have a beneficial effect on MASH, said Dr. Gastaldelli. “They have not shown effectiveness in the resolution of fibrosis, but this might take longer to manifest. However, if the medication is started early enough, it may prevent severe fibrosis. Significant weight loss, both with lifestyle and pharmacological treatment, should lead to an improvement in the liver too.”
There are currently no drugs available in Europe for the treatment of noncirrhotic MASH and severe fibrosis (stage ≥ 2). Resmetirom is the first approved MASH-targeted treatment in noncirrhotic MASH and significant liver fibrosis, with histological effectiveness on steatohepatitis and fibrosis, together with an acceptable safety and tolerability profile, but, for the moment, this agent is only available in United States.
Finally, turning to MASH-related cirrhosis, the guidelines advise adaptations of metabolic drugs, nutritional counseling, and surveillance for portal hypertension and hepatocellular carcinoma, as well as liver transplantation in decompensated cirrhosis.
After the session, this news organization spoke to Tushy Kailayanathan, MBBS BSc, medical director of the liver MRI company, Perspectum, who reviewed the limitations of the FIB-4 test. The FIB-4 test identifies those with advanced fibrosis in the liver, for example, patients with hepatitis C, she noted; however, “it performs worse in type 2 diabetic patients and in the elderly. There is little clinical guidance on the adjustment of FIB-4 thresholds needed for these high cardiometabolic risk groups. The priority patients are missed by FIB-4 because those individuals with early and active disease may not yet have progressed to advanced disease detected by FIB-4.”
These individuals are exactly those amenable to primary care prevention strategies, said Dr. Kailayanathan. Because of the nature of early and active liver disease in patients with high cardiometabolic risk, it would make sense to shift some diagnostic protocols into primary care.
“These individuals are exactly those amenable to primary care prevention strategies at annual diabetic review because they are likely to have modifiable cardiometabolic risk factors such as metabolic syndrome and would benefit from lifestyle and therapeutic intervention, including GLP-1 RAs and SGLT2is [sodium-glucose cotransporter-2 inhibitors],” she said. “Case-finding and detection of early-stage MASLD is a priority in diabetics, and there is an unmet need for accurate biomarkers to measure liver fat and inflammation early.”
Dr. Gastaldelli has been on the advisory board or consulting for Boehringer Ingelheim, Novo Nordisk, Eli Lilly, Fractyl, Pfizer, Merck-MSD, MetaDeq and a speaker for Eli Lilly, Novo Nordisk, and Pfizer. Dr. Kailayanathan is medical director at Perspectum, a UK-based company involved in liver imaging technology.
A version of this article first appeared on Medscape.com.