Abstract
Sarcopenia’s impact on hepatocellular carcinoma (HCC) outcomes is well-documented, but the effects of pre-sarcopenia remain unclear. This study investigates the impact of pre-sarcopenia on tumor response and survival in patients with unresectable HCC undergoing transarterial chemoembolization (TACE). We retrospectively evaluated muscle volume using the SliceOmatic software in patients with unresectable HCC treated with TACE. Pre-sarcopenia was defined by Japan Society of Hepatology standards (men: 42 cm2/m2; women: 38 cm2/m2). Pre-sarcopenia and non-pre-sarcopenia groups were compared, and Cox proportional hazards model was used to identify survival-influencing variables. Subgroup analysis was conducted stratified by the tumor burden, using serum alpha-fetoprotein (AFP) levels at a diagnostic cutoff value of 200 ng/mL. Of the 100 patients, 39 had pre-sarcopenia. The presence of pre-sarcopenia was not associated with tumor complete response achievement. The median overall survival (OS) was significantly lower in the pre-sarcopenia group (18 months) than in the non-pre-sarcopenia group (30 months; log-rank P = 0.039). Subgroup analysis among 77 patients with AFP < 200 ng/mL revealed that OS was particularly poor in the pre-sarcopenia group (16 vs. 34 months; log-rank P < 0.001). Multivariate analysis identified increased AFP (adjusted hazard ratio [HR] per 10-unit increase 1.142; P < 0.001), higher Model for End-Stage Liver Disease score (adjusted HR per 1-unit increase 1.176; P < 0.001), and pre-sarcopenia (adjusted HR 2.965; P < 0.001) as predictors of shorter OS. Pre-sarcopenia is a significant predictor of increased mortality in patients with unresectable HCC undergoing TACE, especially in those with AFP < 200 ng/mL, suggesting its potential as a target for early intervention.
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Introduction
Hepatocellular carcinoma (HCC) is the sixth most common cancer and the fourth leading cause of cancer-related deaths worldwide1. The prognosis of HCC remains poor despite improvements in therapy; this may be because most HCC patients exhibit an advanced stage at diagnosis, leaving palliative treatment as their only option2,3. Transarterial chemoembolization (TACE) is currently the mainstream therapeutic strategy for patients with unresectable HCC with preserved liver function2,3. The prognosis following TACE primarily depends on both tumor- and host-related factors: hepatic function and the patient’s general condition are important influencing factors4,5.
Sarcopenia is defined as the loss of skeletal muscle mass and functional capacity (including muscle strength or physical function), whereas pre-sarcopenia is specifically defined as low muscle mass without an impact on muscle strength. Sarcopenia is classified as either primary (associated with aging) or secondary (associated with chronic illness)6. HCC is closely associated with chronic liver disease and cirrhosis7, and is often associated with protein-energy malabsorption and sarcopenia8. Thus, unsurprisingly, the prevalence of sarcopenia in patients with HCC is high9,10. Notably, sarcopenia has attracted attention as a predictor of poor prognoses in patients with HCC. In recent years, evidence has increasingly supported the negative impact of reduced muscle mass on the clinical outcomes of patients with chronic liver disease and HCC11,12,13,14,15. Several studies have demonstrated the negative impact of sarcopenia on the prognosis of patients with HCC after treatment. However, data on the effect of pre-sarcopenia on the survival outcomes of patients with HCC remain limited. The presence of pre-sarcopenia has been shown to correlate with a poor prognosis in patients with HCC after radiofrequency ablation and sorafenib treatment16,17,18. Nevertheless, information on the prevalence and significance of pre-sarcopenia in patients with unresectable HCC treated with TACE is limited, and no previous study has evaluated the impact of pre-sarcopenia on treatment outcome.
Therefore, the present study aimed to investigate the impact of pre-sarcopenia on treatment response and survival outcomes in patients with unresectable HCC who underwent conventional TACE.
Methods
Study design
This retrospective, single-center, observational cohort analysis was conducted at Hatyai Hospital, a leading referral center in southern Thailand, from January 2014 to December 2021. The Institutional Review Board of the Hatyai Hospital (Human Research Ethics Committee Hatyai Hospital, approval number HYH EC 019-65-01) approved this study and waived the requirement for obtaining informed consent because of its retrospective nature. This study adhered to the ethical principles outlined in the Declaration of Helsinki. All data were anonymized prior to analysis to maintain patient confidentiality.
Patient population
Eligible participants were individuals aged 18 years and older, diagnosed with HCC based on histological evidence or non-invasive criteria, presenting with unresectable disease or contraindications for surgical resection, and who underwent TACE as the initial treatment modality. Included patients were at Barcelona Clinic Liver Cancer (BCLC) stage 0, A, B, or C. We excluded patients who underwent any curative treatment post-initial TACE and those with infiltrative tumor types; incomplete abdominal computed tomography (CT) examination including L3; renal, cerebral, or cardiopulmonary dysfunction; Child–Turcotte–Pugh (CTP) stage C; extrahepatic metastasis at diagnosis; or incomplete datasets.
Data collection
Data were retrospectively compiled, including clinical and anthropometric parameters at diagnosis (age, sex, body mass index [BMI], comorbidities, hepatitis infection status, alcohol consumption history, laboratory findings, and tumor characteristics) and clinical outcomes (total number of treatments and post-treatment response). Data acquisition was performed by two independent investigators, each with more than a decade of experience in hepatology, ensuring consensus to reconcile any discrepancies.
Skeletal mass index and pre-sarcopenia definition
Skeletal muscle evaluation was conducted using CT scans at the time of diagnosis, focusing on the third lumbar vertebra level where the transverse processes were distinctly visible. The total cross-sectional muscle area (cm2) was quantified using SliceOmatic version 5.0 software (Tomovision, Montreal, QC, Canada) by demarcating the muscular boundaries within Hounsfield unit (HU) thresholds of − 29 to + 15019. The psoas, erector spinae, quadratus lumborum, transversus abdominis, external oblique, internal oblique, and rectus abdominis muscles were analyzed20. The skeletal muscle index (SMI) was calculated as the aggregate muscle area divided by height squared21. Based on the sarcopenia criteria for liver disease proposed by the Japan Society of Hepatology22, the threshold for pre-sarcopenia was defined as an SMI below 42 cm2/m2 for men and below 38 cm2/m2 for women. Based on these criteria, patients were classified into “pre-sarcopenia” and “non-pre-sarcopenia” cohorts.
Treatment and assessment of tumor response
After deliberation by a multidisciplinary team, TACE was performed on eligible patients. This decision-making process involved achieving a consensus between healthcare professionals and patients, adhering to established local protocols23. Following TACE, the assessment of treatment response was systematically conducted 4-weeks post-procedure via multiphasic hepatic CT scans or magnetic resonance imaging (MRI) in accordance with the modified Response Evaluation Criteria in Solid Tumors24.
In alignment with the European guidelines on HCC management2, the option to repeat TACE was considered 2 months after the initial treatment if a partial response was observed on post-treatment imaging with preserved hepatic function. This decision was contingent upon re-evaluation by a multidisciplinary tumor board. Patients who achieved a complete response (CR) underwent routine surveillance involving dynamic contrast-enhanced CT or MRI and serum alpha-fetoprotein (AFP) measurement every 3 months during the first year after treatment, transitioning to biannual follow-up provided no indications of HCC recurrence were found.
Definitions and outcomes
HCC was diagnosed in accordance with the international diagnostic criteria by employing the Barcelona Clinic Liver Cancer (BCLC) system for tumor staging2,3. Viral hepatitis was diagnosed based on serological evidence of hepatitis B virus (HBV) surface antigen or hepatitis C virus (HCV) antibody, further confirmed by the detection of HBV DNA or HCV RNA. Alcohol-related liver disease was determined in cases in which individuals had documented daily alcohol consumption of at least 40 g over a period of 5 years25,26. The diagnosis of cirrhosis was substantiated by clinical features, radiological findings, and/or histopathological examination. Portal hypertension was defined as the presence of one or more of the following: ascites, esophageal or gastric varices, or splenomegaly, with a platelet count < 100,000/mm3. Hepatic function was appraised using CTP and Model for End-Stage Liver Disease (MELD) scores27,28. The Eastern Cooperative Oncology Group Performance Status scale was utilized to categorize patient’s functional status29.
Overall survival (OS) was defined as the interval from the HCC diagnosis date to the endpoint of either mortality or the most recent follow-up. We determined patients’ vitality status at the time of data censoring (January 1, 2023) using records obtained from the Thai civil registration system.
Statistical analyses
Qualitative variables are expressed as numbers and percentages and were tested for equality using Pearson’s χ2 test or Fisher’s exact test. All quantitative data were presented as mean ± standard deviation (SD) or median and interquartile range, depending on their distribution. The significance of differences between groups was established using Student’s t-test or the Wilcoxon rank-sum test, as appropriate. Logistic regression analyses were performed to determine factors affecting CR achievement. OS rates were estimated using the non-parametric Kaplan–Meier method, and group differences were evaluated using the log-rank test. A Cox proportional hazards model was used to explore the potential impact of pre-sarcopenia on survival outcomes. Hazard ratios (HR) and 95% confidence intervals (95% CIs) were calculated. After univariate analysis, variables with a p-value < 0.1, along with age and sex, were incorporated into a multivariate analysis framework (utilizing backward selection methodology). All statistical evaluations were conducted using Stata Version 15.1 (StataCorp LLC, College Station, TX, USA), with a predetermined alpha level of 0.05 denoting statistical significance.
Ethical approval
Ethical approval was obtained from the Ethics Committee of Hatyai Hospital (HYH EC 019–65-01). The need for obtaining informed consent was waived due to the nature of the study.
Results
Patient characteristics
One hundred patients diagnosed with HCC fulfilled the inclusion criteria and were enrolled in the study. The cohort’s mean age was 58.8 ± 11.2 years, with females constituting 25% (n = 25) of the population. BCLC staging revealed 4% (n = 4) at stage 0, 22% (n = 22) at stage A, 69% (n = 69) at stage B, and 5% (n = 5) at stage C. Regarding baseline liver functionality, 57% (n = 57) of patients were classified as CTP grade A, whereas 43% (n = 43) were classified as grade B. Pre-sarcopenia was identified in 39 (39%) patients.
Tables 1 and 2 show the demographic data, tumor characteristics, and treatment outcomes of the entire cohort, along with a comparative analysis between patients with and without pre-sarcopenia. Notably, significant differences in BMI and serum albumin levels were observed between patients with and without pre-sarcopenia. Specifically, BMI was significantly lower in the pre-sarcopenia (mean ± SD = 22.0 ± 4.8 kg/m2) than in the non-pre-sarcopenia group (mean ± SD = 25.5 ± 4.0 kg/m2, P < 0.001). Similarly, serum albumin levels were lower in the pre-sarcopenia group (mean ± SD = 3.2 ± 0.7 g/dL) than in their non-sarcopenia counterpart (mean ± SD = 3.5 ± 0.6 g/dL, P = 0.049). Other baseline characteristics, including sex, age, laboratory results, HCC status, serum biomarkers, and the number of TACE sessions, did not differ significantly between the groups.
Post-treatment tumor response and factors for achieving CR
Additionally, the analysis revealed that the proportion of patients who achieved CR after treatment did not differ significantly between the pre-sarcopenia and non-pre-sarcopenia groups. Furthermore, the presence of pre-sarcopenia was not associated with CR achievement after treatment in multivariate logistic regression analysis (Table S1 in Supplementary Information).
Relationship between pre-sarcopenia before TACE and survival
Based on the Kaplan–Meier method, the median OS in the pre-sarcopenia group was significantly lower at 18 months when compared to the 30 months in the non-pre-sarcopenia group (log-rank P = 0.039). (Fig. 1). Table 3 shows the prognostic factors for OS in the univariate and multivariate analyses. The multivariate analysis revealed that only the MELD score was significantly associated with decreased survival (adjusted hazard ratio [HR] per 1-unit increase 1.117; P = 0.001).
Impact of pre-sarcopenia before TACE on OS after stratification by tumor burden
Analyses were also conducted on subgroups of patients stratified by the tumor burden, using serum AFP levels at a diagnostic cutoff value of 200 ng/mL. Among the 29 patients with serum AFP levels ≥ 200 ng/mL, the presence of pre-sarcopenia did not significantly correlate with an increased risk of death (log-rank P = 0.069) (Figure S1 in Supplementary Information). Conversely, in the subgroup of 71 patients with serum AFP levels < 200 ng/mL, the median OS was notably worse for the pre-sarcopenia group (16 months) than that for the non-pre-sarcopenia group (34 months; log-rank P < 0.001) (Fig. 2). The multivariate Cox proportional hazards analysis identified increased AFP level (adjusted HR per 10-unit increase 1.142; P < 0.001), higher MELD score (adjusted HR per 1-unit increase 1.176; P < 0.001), and the presence of pre-sarcopenia (adjusted HR 2.965; P < 0.001) as significant predictors of shorter OS (Table 4).
Discussion
In recent years, the focus on predicting outcomes in patients with HCC undergoing TACE has expanded to include the role of muscle mass, in terms of sarcopenia23. Here, we explored the significance of pre-sarcopenia in patients with unresectable HCC who underwent TACE and found that pre-sarcopenia did not predict post-treatment tumor response. Patients with pre-sarcopenia had markedly poorer OS when compared to those without pre-sarcopenia. This effect was particularly pronounced in patients with serum AFP levels below 200 ng/mL, in whom pre-sarcopenia significantly predicted a worse prognosis.
Most patients (94%) in this study had cirrhosis, which aligns with the understanding that cirrhosis, present in over 80% of HCC patients, is the strongest risk factor for developing HCC30. Further, both HCC and cirrhosis are closely associated with impaired muscle mass8. The prevalence of pre-sarcopenia in our cohort was 39%, higher than in patients with chronic liver disease (15–24%)31 and early-stage HCC (16%)17. This is contrast to a recent Japanese study reporting a higher prevalence of pre-sarcopenia among advanced HCC patients (57%)16. Our cohort, primarily at the intermediate stage of HCC, shows a prevalence rate lying between these two previously reported rates. This variation underscores the complex interplay between cirrhosis, tumor progression, and muscle mass reduction, emphasizing that the presence of pre-sarcopenia is linked to both tumor staging and baseline hepatic function.
Recent studies have investigated the role of muscle mass in determining both procedural outcomes and tumor responses after TACE for HCC. Notably, investigations by Loosen et al.32 and Roth et al.33 have demonstrated that sarcopenia present prior to interventions does not significantly influence the rate of tumor response or progression post-TACE. These findings are consistent with those of our study, which identified no significant correlation between pre-treatment pre-sarcopenia and tumor response to TACE. This suggests that tumor-specific characteristics and hepatic reserves may play a more pivotal role than does nutritional status in influencing post-treatment tumor dynamics, which warrants further exploration.
The prevalence of protein–energy malnutrition in HCC, often under-assessed by conventional laboratory tests, highlights the need for more accurate nutritional status indicators. The advent of noninvasive techniques for skeletal muscle evaluation has led to the inclusion of sarcopenia as a prognostic factor across various medical domains, including liver disease management34. Prior investigations have demonstrated the prognostic utility of reduced muscle mass, highlighting it as a surrogate marker for functional capacity and nutritional status. Additionally, skeletal muscle depletion is linked to poor survival, partly due to endocrine changes affecting muscle synthesis and catabolism35. Lower insulin-like growth factor (IGF)-1 levels in HCC patients correlate with reduced muscle mass and poor survival, indicating that severe sarcopenia and low IGF-1 levels may reflect poor liver function and higher mortality17. However, although sarcopenia has been reported to be a strong prognostic factor for overall survival in cancer patients, including those with HCC15,36,37, the effects of pre-sarcopenia remain poorly studied. Thus, the identification of pre-sarcopenia as a critical factor influencing post-TACE outcomes underscores the importance of early recognition of and intervention targeting muscle mass preservation in HCC management.
Although the prognostic value of pre-sarcopenia in surgical resection38,39,40, liver transplantation41,42, and sorafenib treatment16,43 for HCC has been documented, its effect on outcomes following TACE in unresectable HCC remains underexplored. Our analysis revealed that, although OS was reduced in patients with pre-sarcopenia, it was not a statistically significant prognostic factor across the cohort. This discrepancy might be attributed to the overarching influence of HCC itself, as demonstrated by Kobayashi et al., who found that AFP levels were a more potent predictor of survival than muscle mass reduction44. In dissecting the impact of pre-sarcopenia, our study stratified patients based on tumor burden, as defined by AFP levels at diagnosis. Interestingly, in the subset of patients with AFP levels > 200 ng/mL, pre-sarcopenia did not significantly affect prognosis. Conversely, pre-sarcopenia significantly predicted worse outcomes in patients with lower AFP levels, highlighting it as a potential independent risk factor for mortality (HR = 2.965). These observations imply that, in the context of a high tumor burden where survival prospects are inherently limited, the impact of pre-sarcopenia on survival might be mitigated. Given these insights, muscle volume is a plausible prognostic indicator in HCC management, particularly in patients with a lower tumor burden.
Our results have practical clinical implications for treatment strategies for patients with unresectable HCC. Early identification of patients at an increased mortality risk is critical and significantly shapes clinical management strategies for HCC. Prompt recognition of skeletal muscle depletion, combined with targeted nutritional support and physical therapy, is essential in sarcopenia management and may improve prognosis in HCC patients45,46. Recent guidelines recommend specific nutritional strategies2, including supplementation with branched-chain amino acids and L-carnitine, to protect liver function and enhance muscle protein synthesis32. Additionally, pre-treatment leucine/creatine supplementation can boost muscle synthesis and maintain strength47. Physical exercise also plays a critical role in reducing muscle atrophy and weight loss in HCC patients48. Furthermore, the prognostic implications of sarcopenia can inform deliberations over the timing and necessity of subsequent TACE procedures, helping identify individuals who may benefit from accelerated retreatment schedules. Additionally, in cases where TACE is deemed unsuitable, early recognition of a potentially poor prognosis may facilitate the transition to early systemic therapeutic options46. Consequently, we advocate the integration of muscle status evaluations within the clinical decision-making framework for TACE eligibility to facilitate the initiation of tailored nutritional interventions for patients with diminished muscle mass.
The widespread use of TACE has led to the development of several scoring systems to predict patient survival, such as the HAP score, six-and-twelve score, ALBI-TAE model, and FAIL-T model, which combine tumor-specific and patient-specific factors49,50. However, these systems do not include muscle wasting as a factor. Recently, Wang et al. developed a novel prognostic nomogram incorporating the neutrophil-to-lymphocyte ratio and sarcopenia, which demonstrated strong predictive performance and outperformed other currently available models51. This innovative approach highlights the importance of including muscle mass evaluation in future risk stratification models to improve prognostic accuracy and patient management.
To the best of our knowledge, no previous study has evaluated the effect of pre-sarcopenia in patients with HCC who underwent TACE. However, this study also had some limitations. First, the retrospective nature of this cohort study introduced inherent constraints, notably the lack of systematically recorded data on subjective factors, such as appetite loss or anorexia, as well as objective measures of muscular strength, including grip strength and walking speed, usually regarded as diagnostic criteria for sarcopenia. Additionally, the absence of CT data for a subset of patients may have introduced a selection bias. Second, while providing valuable insights, the sample size of 100 patients may be considered limited for the complex analysis of endpoints, such as OS. This could have affected the robustness and statistical power of the findings, particularly in the subgroup analysis. Third, this single-center study conducted exclusively in Thai patients introduces the possibility of center-specific biases, thereby limiting the generalizability of the results to broader populations. Despite these constraints, this study offered significant real-world insights into managing HCC in a community-based hospital setting in Thailand, a region with constrained medical resources. Fourth, the absence of key datapoints, such as baseline clinical status parameters including accurate BMI (which may be affected by ascites or edema), and the occurrence of new extrahepatic metastasis during treatment may have influenced survival outcomes and potentially impacted the study results. Finally, the inclusion criteria spanned an extended period during which the methodologies applied for TACE evolved. This temporal variation might have influenced the consistency and applicability of our findings across the entire study cohort.
Conclusion
Pre-sarcopenia significantly predicts increased mortality in patients with unresectable HCC undergoing TACE, particularly in those with serum AFP levels < 200 ng/mL, and could be an intervention target among such patients.
Data availability
The datasets used and/or analyzed in the current study are available from the corresponding author upon reasonable request.
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Funding
This research received funding support from the Medical Council of Thailand (Police General Dr. Jongjate Aojanepong Foundation). The funder had no role in the study design, data collection or analysis, or manuscript preparation.
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Author contributions: Attapon Rattanasupar was the main contributor to manuscript writing and collected and analyzed the data. Tanaporn Prateepchaiboon, Keerati Akarapatima, Apiradee Songjamrat, and Songklod Pakdeejit collected information on patients with hepatocellular carcinoma. Arunchai Chang provided ideas for this study and critically revised the manuscript for important intellectual content. All the authors have read and approved the final manuscript.
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Rattanasupar, A., Prateepchaiboon, T., Akarapatima, K. et al. Impact of pre-sarcopenia on outcomes of transarterial chemoembolization in unresectable hepatocellular carcinoma. Sci Rep 14, 19249 (2024). https://doi.org/10.1038/s41598-024-70266-0
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DOI: https://doi.org/10.1038/s41598-024-70266-0
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