Abstract
Non-Alcoholic Steatohepatitis (NASH) rates are progressively accelerating due to lifestyle changes, which contribute to increased Hepatocellular carcinoma (HCC) incidence. HCC accounts for 90% of liver cancer cases, which ranks as the sixth prevalent, and the third leading cause of cancer-related deaths globally. NASH-HCC outweighs the decline in viral hepatitis-HCC, leaving a gap in the available therapies. The limited overall survival in the current treatments invokes the necessity of exploring novel therapeutic strategies to improve the poor prognosis of HCC. The pH gradient is a hallmark of cancer and is associated with increased intracellular sodium. Elevating this accumulation of intracellular sodium with sodium ionophores, such as Monensin, leads to selective death of murine HCC cancer cells without affecting the functionality of vital organs and proliferating activity of normal and transformed tissues. This study synthesizes the status of HCC risk and management, its molecular landscape, and sheds light on exploiting the elevated accumulation of intracellular sodium as a novel therapeutic strategy against HCC.
1 Introduction
Liver cancer is the sixth most frequently diagnosed cancer and the third leading cause of death in cancer-related mortalities worldwide. In 2025, about 1 million new incidents are predicted to occur compared with 840,000 in 2018 whereas fatalities are foreseen to rise by more than 50% by 2040 (Rumgay et al., 2022). HCC represents roughly 90% of liver malignancies, with incidence rates increasing with age ().
HCC global epidemiology is shifting, with steady increases in the projected incidence in the upcoming 30 years. Hepatitis B virus (HBV) infection was considered the most common risk factor for HCC. Recent advances in HBV vaccination, treatments, and preventive measures for HBV and the Hepatitis C virus (HCV) have reduced the global incidence. For instance, Direct-acting antiviral (DAA) reduced the risk of HCC by 50%–80%. While viral hepatitis caused by HBV and HCV is dipping, NASH-related Hepatocellular Carcinoma (HCC) prevalence is widely increasing, in a pattern that overweighs the decline in viral hepatitis-related HCC, leading to a net increase in overall incidence (). These global trends are mostly attributed to increasing obesity, diabetes, and NASH prevalence (). However, up to 25% of HCC cases occur in patients without a history of cirrhosis or its associated risk factors ().
2 NAFLD development into HCC
Non-alcoholic fatty liver disease (NAFLD) is the most globally prevalent chronic liver disease, which affects 25% of the global population. Hepatic steatosis evolves into nonalcoholic steatohepatitis (NASH), which is the fastest-growing leading cause of HCC, through a series of fibrosis and cirrhosis if left untreated (Figure 1A) (Zhang et al., 2023). 0.5%–2.6% and 0.01%–0.13% of NASH-related cirrhosis and non-cirrhotic NAFLD evolve into HCC annually, respectively. Even though the incidence of developing HCC from NAFLD is lower than developing it from viral hepatitis, the prevalence of viral hepatitis is much less than the prevalence of NASH (). Steatosis is a reversible process led by the accumulation of lipids in the liver. The accumulated lipids can lead to chronic inflammation, reactive oxygen species (ROS) generation, and lipid peroxidation. The chronic inflammation and persistent injury activate hepatic stellate cells, leading to extracellular matrix deposition and fibrosis. DNA damage from oxidative stress and chronic inflammation induces mutations in cancer driver genes, leading to malignant transformation (Figure 1A) (Wegermann et al., 2021).
FIGURE 1
3 Diagnostics and clinical manifestations
Typical cases of HCC progress without visible symptoms, complicating the early detection. Cirrhosis can usually be accompanied by liver reserve reduction, resulting in decompensation symptoms like jaundice, encephalopathy, ascites, or variceal bleeding, often associated with portal invasion. While non-cirrhotic patients, more common in high-incidence areas, exhibit serious symptoms including cachexia, abdominal pain, hepatomegaly, or jaundice due to unrestricted tumor growth. Tumor rupture is rare, but it results in hypotension, acute pain, and peritoneal irritation. The most common metastasis locations associated with HCC include abdominal organs, lungs, and bones. HCC can sometimes cause paraneoplastic effects such as hypoglycemia, diarrhea, or cutaneous signs. Porphyria cutanea tarda, linked to hepatitis C, is associated with an increased risk of HCC ().
High plasma levels of Alpha-fetoprotein (AFP) can indicate malignant growth from the same endodermal lining as the hepatic diverticulum, such as the stomach and pancreas. AFP has almost 100% specificity, but low sensitivity. Half the patients may not have diagnostic levels of AFP (400–500 ng/mL), with 30% of patients showing normal serum levels of AFP (below 10 ng/dL) when diagnosis is established (). AFP can be replaced or combined with ultrasound imaging, increasing the Positive Predictive Value to 94%, it can also detect masses smaller than 3 cm (). Ultrasonography (US) is recommended every 6 months alone or with AFP to screen cirrhotic and high-risk patients. magnetic resonance imaging (MRI), multiphase computed tomography (CT), or a biopsy can be indicated to confirm the ultrasonography results.
Liver function tests (LFTs), complete blood cell count (CBC), electrolyte levels, and coagulation tests are indicated for recently diagnosed patients for severity assessment. Diagnosis can be established based on non-invasive imaging alone, regardless of the biopsy; it is also necessary to guide the biopsy if indicated (). Key histological characteristics of HCC identified by the International Consensus Group for Hepatocellular Neoplasia include widespread fatty changes, intra-tumoral portal tracts, stromal invasion, pseudo-glandular architecture, elevated cell density, and unpaired arteries (RONCALLI, 2009). Barcelona Clinic Liver Cancer (BCLC) staging system and the National Comprehensive Cancer Network (NCCN) guidelines are generally followed to stage and manage the disease (Reig et al., 2022).
4 Current therapies
4.1 Surgical and locoregional approaches
The current gold-standard treatment for HCC in its early stages is Orthotopic liver transplantation (OLT), yet less than 10% of patients are eligible. Locoregional therapies are therefore crucial, including Transarterial embolisation (TAE) and chemoembolisation (TACE) that obstruct arterial supply, and deliver local chemotherapy with TACE, which is effective for tumors 3–5 cm. Whereas Radioembolisation (TARE) delivers internal radiation via hepatic arteries. Ablative techniques such as radiofrequency ablation (RFA), cryoablation, microwave ablation, and newer methods like IRE, HIFU, and LITT, can be selected based on tumor size, location, and liver function ().
4.2 Targeted therapies
Targeted therapy has provided a substantial advancement in HCC management, namely, anti-angiogenic agents, such as Vascular Endothelial Growth Factor (VEGF) signaling targeted agents. Bevacizumab is a humanized monoclonal antibody that binds and inhibits VEGF-A, which has demonstrated a better outcome in combination with immunotherapies. Ramucirumab is a fully human IgG1 that targets VEGFR-2, which in Phase III REACH-2 trial achieved a higher response and disease control rates (5% vs. 1%, 60% vs. 39%, respectively), and improved overall survival (OS) (8.5 vs. 7.3 months; HR 0.71; 95% CI 0.531–0.949) against placebo in HCC patients with post-sorafenib progression (Zhu et al., 2019). The multi-kinase inhibitor (TKI) sorafenib has shown superior efficacy in HCV-related HCC (14 vs. 7.4 months), and its survival benefits were confirmed in SHARP and a phase III Asia-Pacific region trials (10.7 vs. 7.9 months and 6.5 vs. 4.2 months, respectively) (; ). While Orantinib did not improve OS in phase-III ORIENTAL (Taiho Pharmaceutical Co., Ltd, 2019). Apatinib (targets VEGF-2) and lenvatinib (multi-TKI) have shown outcomes like sorafenib. Other TKIs like regorafenib and cabozantinib can be considered in second-line treatment following post-sorafenib progression, with favorable pharmacokinetic properties associated with donafenib (). Another novel approach is inhibiting telomerase activity leading to disrupting cacner cell immortality with imetelstat, perifosine, KML001, and BIBR1532, or with immunotherapeutic peptides targeting the catalytic subunit hTERT, including GV1001, P540, GX301, and Vx-001 (; Wang and Deng, 2023).
4.3 Immunotherapies
HCC responds to immunotherapies, mainly immune checkpoint inhibitors (ICIs), which demonstrated superior effectiveness to sorafenib alone when combined with anti-angiogenic agents (). This was confirmed by IMbrave150 (atezolizumab and bevacizumab), HIMALAYA/STRIDE (durvalumab and tremelimumab), and rivoceranib and camrelizumab have significantly improved OS compared to sorafenib. ICIs can complement or follow locoregional treatments to eliminate residual disease (). Eight trials comprising 6,290 patients were integrated into a meta-analysis to find that the atezolizumab/bevacizumab combination significantly outperformed sorafenib (HR 0.58), nivolumab (HR 0.68), and lenvatinib (HR 0.63) in terms of OS (Wang and Deng, 2023). Therefore, this combination is the current preferred first-line therapy for unresectable or advanced HCC (). Despite these advancements, challenges remain due to modest survival benefits, high treatment costs, and substantial toxicity, highlighting a persistent need for more effective and accessible therapies.
5 Sodium homeostasis: a novel target for HCC therapy?
Sodium homeostasis is an under-researched field in cancer. Several indirect and direct evidence, however, associate [Na+]i variations with crucial features of transformed tissue and suggest that disruption of Na + homeostasis might be a potential molecular mechanism for therapeutic interventions for HCC and cancer in general.
5.1 Na+ and reverse pH gradient in cancer
In cancer, the intracellular alkalosis and the acidic extracellular environment create a reverse pH gradient compared with untransformed tissue. This reverse pH gradient favors cancer cell division, migration and resistance to chemotherapy and hypoxia. pH-regulating proteins are, thus, receiving growing scientific attention as oncologic targets. Their critical importance in untransformed tissue, however, makes it difficult to safely manipulate their functionality.
Intracellular alkalosis occurs as a paradoxical reaction to the increase of acidic molecules produced by the glycolytic ATP production (Warburg effect) and it is due to the augmented expression of Na+-independent and Na+-dependent pH controlling systems (i.e., Na+/H+ and Na+-HCO3- exchanger) (Webb et al., 2011; Parks et al., 2013). Together with Na+-dependent pH regulatory proteins, Na + transporters are generally upregulated in HCC and cancer in general (i.e., Na+/Ca2+ exchanger, Na+/K+/2Cl- and Na+/glucose co-transporters) or are expressed in HCC but not in the corresponding un-transformed tissue (acid sensitive ion channels). They all operate favoring a net Na + influx from the extracellular space into the cytosol, thus elevating [Na+]i. (). Significantly, this phenomenon was recently demonstrated in human cancers. Non-invasive 23Na-magnetic resonance imaging analysis of human malignant gliomas, breast and prostate tumors confirmed a higher concentration of Na+i and Na+e compared to surrounding normal tissues (; ; ; Ruggiero et al., 2018; ). Studies employing “in vivo Field-Cycling Relaxometry”, parallelly, evidenced an augmented water exchange in human cancer tissues, indicating an increased intracellular osmotic pressure in tumors that correlated to cancer aggressiveness (28). These observations showed that the reverse pH gradient is associated with the tendency of cancer cells to accumulate and maintain high levels of intracellular sodium.
5.2 Na+ and death and survival of primary hepatocytes
Early studies explored the role of [Na+]i variations in death and resistance to death of un-transformed rodent hepatocytes. They demonstrated that Na + overload preceded primary hepatocyte death induced by various toxic conditions affecting mitochondrial activity and energy production, and that preventing Na + increase delayed the appearance of cell death. They also showed that the irreversible increase of intracellular Na+ was associated to volume deregulation and to the appearance of cell death following ATP depletion (; ). Subsequent investigations on the intrinsic protective mechanisms of hepatic preconditioning additionally demonstrated that the increased resistance to hypoxic damage of preconditioned hepatocytes was causally associated with the maintenance of Na + homeostasis (; ).
5.3 Anticancer activity of the sodium ionophore Monensin
Monensin is a sodium and proton selective ionophore that facilitates sodium ion entrance into the cells (PubChem, 2025). It works by forming complexes with sodium ions (Na+), which pass through the cell membrane due to the high lipophilicity, then release the sodium ion in the cytoplasm (Figures 1B,C). It is classified as a coccidiostat and nonhormonal growth promoter in veterinary medicine (). The activity of Monensin against several tumors has been demonstrated in many studies on cancer cells and animal models. These studies include HCC (), breast cancer (), ovarian cancer (Yao et al., 2021), neuroblastoma (Serter Kocoglu et al., 2023), chemo-resistant pancreatic cancer (Wang et al., 2018), prostate cancer (), ovarian and pancreatic tumors and colorectal cancer (Zhou et al., 2023).
Previously, the anticancer effect of Monensin was thought to be based on cytostatic properties, modifying intracellular signaling such as Wnt/β-catenin and/or growth factor-activated signal pathways (particularly, EGFR) (; Wang et al., 2018).
However, novel observations appeared to rule out this theory, showing that the cytostatic action of Monensin described in the in vitro studies depended by the cell colture settings and was not detectable in vivo (). In particular Monensin demonstrated to reduce triple-negative breast cancer (TNBC) development without displaying anti-proliferative effect on malignant tissues, evident by no significant changes in Proliferating Cell Nuclear Antigen (PCNA) and Ki-67 expression (). Moreover, in previous experiments on HCC allograft, Monensin showed to significantly reduce tumor growth without changing Ki-67 levels in the tumors, bone marrow, or intestines and without affecting hemopoiesis ().
Monensin’s activity resulted instead related to a tumor-selective sodium-dependent cytotoxicity, which was not associated to the alteration of the integrity of normal tissues. Monensin caused in fact intracellular sodium overload and ATP depletion in cancer cells, leading to expansion of the necrotic area in the tumor mass (; ).
5.4 Monensin inhibits HCC by inducing a specific and sodium-dependent HCC cells killing
In the HCC allograft model, Monensin selectively and furtherly increased intracellular sodium in mice hepatocarcima cells and in HCC mice allograft but not in primary hepatocytes and in healthy tissues. This cancer-specific sodium increase was directly related “in vitro” with energy depletion, increase of mitochondrial sodium content and decrease of basal and ATP- linked mitochondrial O2 consumption, enhancement of intracellular water life-time and killing of mice hepatoma cells and “in vivo” with the regression of allograft tumors in immunodeficient mice, with extensive necrosis of tumors and no effect on healthy tissues (). These findings suggest that in HCC, the already high intracellular sodium concentration and the continuous sodium influx consequent to the glycolytic metabolism, make the cancer cells unable to energetically cope to the additional sodium influx induced by Monensin with irreversible sodium overload. Such condition initiates a death cascade involving mitochondrial impairment and ATP depletion that ultimately leads to an uncontrolled osmotic swelling and cell death (Figures 1D,E). The tumor-specific action of Monensin, along with its non-measurable toxicity in healthy tissues, highlights its promise as a therapeutic agent for liver cancer.
5.5 Challenges of translating the disruption of cancer sodium homeostasis for HCC therapy
Currently, there are no approved therapies based on sodium homeostasis de-regulations for the treatment of NASH or HCC and cancer in general.
Clinical studies have tested the efficacy of Na+/K+ ATPase inhibitors alone or in combination with other anticancer drugs in cancer patients. Na+/K+ ATPase is upregulated in cancer, and its inhibition has potent anticancer effects in pre-clinical models (). Na+/K+ ATPase ubiquity and its fundamental role for cell volume and cation gradient maintenance, however, argues against the safety of its generalized employment in therapy.
Epithelial Sodium Channel (ENaC), and ASIC (acid-sensing ion channel) are constitutively active and proton-gated Na + channels that transfer Na+ ions into the cytoplasm from the extracellular spaces (). Both EnaC and ASIC are overexpressed in HCC and other extrahepatic cancers (Wang et al., 2022) but, in normal tissues, EnaC are widely represented in several organs while ASIC are mainly confined to nervous systems (). The restricted localization of ASIC and the possible repositioning of the ASIC inhibitor drugs clinically used for epilepsy and psychiatric diseases make ASIC particularly attractive onco-targets (Wang et al., 2022). However, ASIC inhibitors appear effective in preventing EMT and cancer or HCC cells migration by altering the acidic extracellular pH () but are not likely to massively affect intracellular sodium concentration and are not reported to inhibit cancer growth. Moreover, these drugs are prone to causing QT interval prolongation, and NASH patients often have comorbid cardiovascular diseases, which could be a significant obstacle to clinical application.
Sodium ionophores like Monensin demonstrated potent anticancer effects in animals models but they have been not yet tested in clinical studies and Monensin safety studies in humans are limited. A case report () described 8 days of abdominal pain combined with vomiting in a 58-year-old man who orally took 300 mg (4.6 mg/kg) of Monensin. The patient suffered from increased rhabdomyolysis and creatinine kinase, but the effects were resolved 2 months following his discharge. However, the patient already had toxoplasmosis, which could have affected his system before the Monensin exposure. Another report included two patients, one of whom had irreversible cardiopulmonary disease, while the other recovered (Zhang et al., 2021). The toxic dose of Monensin varies based on species, with 2–3, 26, and 200 mg/kg considered lethal for horses, cattle, and chickens, respectively (Todd et al., 1984). Yet no clear data is available about the usage of Monensin in therapeutic doses in humans, or a detailed description of the clinical manifestations upon direct administration under medical monitoring.
6 Discussion
This study summarizes the available therapeutic approaches for HCC and highlights the potentiality of exploring the higher basal sodium concentration in cancer cells, with sodium ionophores, such as Monensin as a novel targetable biomarker. Monensin is showing significant activity against several tumors, many of which lack effective therapies and have a poor prognosis, such as HCC. Its precise molecular mechanism of action, toxicity in humans, and effectiveness in translationally relevant animal models are underexplored. The intracellular alkaline pH of cancer cells is a paradoxical response to the acidic species produced by the Warburg effect and involves the activation or increased expression of cation transporters, including sodium transporters. Thus, the observed increase in intracellular sodium of cancer tissue is proposed to be a correlated consequence.
Available in vivo evidence indicates that Monensin has negligible adverse effects in mice and no cytostatic properties. These supports conducting deeper research in an interdisciplinary approach to better characterize Monensin molecular effects, employing drug discovery tools to develop novel molecules, and identifying further clinical biomarkers indicative of sodium ionophore sensitivity, aligned with precision medicine principles. Besides leading to plasma membrane mechanical lysis, the disruption of sodium homeostasis may affect intracellular calcium concentrations. The latter might produce additional anti-cancer effects, such as modulating autophagy, lipogenesis, or activating immune cells. Future research devoted to such still unexplored aspects of Monensin activity might enlighten novel therapeutic properties of sodium ionophores that can either potentiate their cancer-selective cytotoxic action or compensate possible rising resistant genotypes of HCC cells to cell death by sodium and water overload.
Statements
Author contributions
AA: Investigation, Formal Analysis, Writing – original draft. SF: Formal Analysis, Investigation, Writing – review and editing. FT: Formal Analysis, Investigation, Writing – review and editing. RC: Investigation, Writing – review and editing, Conceptualization, Funding acquisition, Supervision.
Funding
The author(s) declare that financial support was received for the research and/or publication of this article. This work was funded by the Italian Association for Cancer Research (AIRC, Grants IG-2020-24351 to RC) for the Project: BOOSTING THE INCREASE OF INTRACELLULAR SODIUM TO KILL SELECTIVELY HEPATIC CANCER CELLS: PRECLINICAL PROOF OF CONCEPT.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Summary
Keywords
hallmarks of cancer, Hepatocellular carcinoma, Monensin, non-alcoholic fatty liver disease, cancer targeting treatment, sodium homeostasis, Warburg effect
Citation
Ashkar A, Fiorilla S, Tasso F and Carini R (2025) NASH-related Hepatocellular carcinoma: current therapeutic approaches and the emerging role of sodium homeostasis as a novel targeting strategy. Front. Pharmacol. 16:1671001. doi: 10.3389/fphar.2025.1671001
Received
22 July 2025
Accepted
25 August 2025
Published
03 September 2025
Volume
16 - 2025
Edited by
Wei Guo, University of North Carolina at Greensboro, United States
Reviewed by
Lu-Qi Cao, St. John’s University, United States
Updates
Copyright
© 2025 Ashkar, Fiorilla, Tasso and Carini.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Abdulsalam Ashkar, 20058588@studenti.uniupo.it; Rita Carini, rita.carini@med.uniupo.it
Disclaimer
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