Metabolic Reprogramming in Cancer Cachexia

Background/Objectives: Pancreatic cancer-associated cachexia (CAC) is a complex, multifactorial and multi-organ metabolic syndrome affecting approximately 80% of patients with pancreatic ductal adenocarcinoma (PDAC). Recent epidemiological data show that cachexia is a primary cause of mortality in PDAC, directly accounting for approximately 30% of cancer-related deaths and significantly limiting the tolerability of cancer therapy and is associated with adverse effects of treatment. It is defined by systemic weight loss, skeletal muscle atrophy (sarcopenia), and adipose tissue depletion, often driven by systemic inflammation and metabolic dysregulation. Methods: The literature was searched in PubMed and Scopus using combinations of keywords. The search covers the literature between 2016 and 2026, but papers before this period were also included because of their historical importance. Studies with higher evidential value, such as prospective studies, randomized controlled trials, and meta-analyses, were prioritized and emphasized in our analysis. Results: CAC in PC arises from a systemic inflammatory response driven by tumor-host interactions and the release of pro-inflammatory mediators, such as growth differentiation factor 15 (GDF-15) and parathyroid hormone-related protein (PTHrP), which promotes anorexia and weight loss. The most commonly used diagnostic criteria include unintentional weight loss of more than 5% of body mass within 6 months, a body mass index (BMI) below 20 kg/m2, or weight loss greater than 2% in the presence of sarcopenia. Emerging evidence supports the use of AI-based body composition analysis and novel biomarkers, including GDF-15 levels, to improve the detection and monitoring of cachexia. This review highlights that, despite the absence of pharmacological agents specifically approved for CAC in the United States and Europe, current guidelines recommend multimodal supportive care, including low-dose olanzapine, nutritional support, and exercise-based interventions. Furthermore, we identify recent phase 2 trials targeting the GDF-15 pathway, such as the GDF-15 inhibitor ponsegromab, which have demonstrated significant improvements in body weight and physical activity, suggesting a potential breakthrough in targeted therapies for CAC. Conclusions: CAC in PDAC represents a critical unmet medical need in oncology. It manifests as a lethal systemic pathology that demands early identification and targeted personalized pharmacological and nutritional interventions. Early diagnosis and targeted intervention represent promising strategies for improving survival and quality of life in this high-risk patient population.

Sa1725 A Novel Rat Cachexia Model With Possible Ghrelin Resistance Made by Inoculation of a Gastric 85as2 Cancer Cell Line: A Traditional Japanese Medicine Rikkunshito Ameliorates Cachexia Symptoms by Potentiation of Ghrelin Receptor-Mediated Signaling

Astaxanthin (AST) is a natural marine carotenoid with a variety of biological activities. This study aimed to demonstrate the possible mechanisms by which AST improves skeletal muscle atrophy in cancer cachexia. In this study, the effects of different doses of AST (30 mg/kg b.w., 60 mg/kg b.w. and 120 mg/kg b.w.) on skeletal muscle functions were explored in mice with cancer cachexia. The results showed that AST (30, 60 and 120 mg/kg b.w.) could effectively protect cachexia mice from body weight and skeletal muscle loss. AST dose-dependently ameliorated the decrease in myofibres cross-sectional area and increased the expression of myosin heavy chain (MHC). AST treatment decreased both the serum and muscle level of IL-6 but not TNF-α in C26 tumor-bearing cachexia mice. Moreover, AST alleviated skeletal muscle atrophy by decreasing the expression of two muscle-specific E3 ligases MAFBx and MuRF-1. AST improved mitochondrial function by downregulating the levels of muscle Fis1, LC3B and Bax, upregulating the levels of muscle Mfn2 and Bcl-2. In conclusion, our study show that AST might be expected to be a nutritional supplement for cancer cachexia patients.

9099 Background: Cancer cachexia syndrome, affecting up to 80% of patients (pts) with NSCLC, is characterized by systemic inflammation, negative protein and energy balance and poor patient outcome. HGS has been independently correlated with outcome in pts with advanced cancer. We investigated the potential association between cachexia, sarcopenia and HGS with outcome in pts with advanced NSCLC treated with ICIs. Methods: Fifty-five pts with NSCLC treated with ICIs were included in the analysis. Patient and disease characteristics and data on outcome measures were prospectively collected. Cancer cachexia was defined as weight loss > 5% in the last 6 months, BMI < 20% (or baseline skeletal muscle index at the level of the 3rd lumbar vertebra consistent with sarcopenia) and any degree of weight loss > 2%. Baseline HGS was measured using the JAMAR analogue dynamometer. Results: Median age was 69 years, 50% of pts had non-squamous histology, 69% had PS 0-1, 61% had cancer cachexia and mean HGS was 27 kgs. Partial response, stable disease and progressive disease was recorded in 16%, 33% and 51% of pts, respectively. Median PFS was 4 months and median OS was 7.8 months. There was no association of cachexia or HGS with tumor burden, number of metastatic sites, LDH or neutrophil/lymphocyte ratio. Cachexia had a negative impact on HGS (p = 0,001). Pts with cachexia had lower response rates (4% vs 37%, p = 0.002), disease stabilization rates (32% vs 81%, p = 0.003) and shorter PFS (3.7 vs 8.2 months, p = 0.008) compared to non-cachectic pts. In multivariate analysis, cachexia independently predicted for shorter PFS (HR = 2.7, CI: 1.15 – 6.46, p = 0.023). Data on sarcopenia are being analyzed and will be presented at the meeting. Conclusions: Cancer cachexia is associated with lower response rates and disease stabilization rates and independently predicts for shorter PFS in pts with NSCLC treated with ICIs. To our knowledge this is the first report demonstrating a between the host’s immune and metabolic responses. The study of cancer cachexia may offer a new platform for the development of novel biomarkers of resistance to ICIs.

Cancer-associated cachexia is characterized, among other symptoms, by a dramatic loss of both muscle and fat. In addition, the cachectic syndrome is often associated with anemia. The object of the present investigation was to assess the effects of erythropoietin (EPO) treatment on experimental cancer cachexia models. The results clearly show that, in addition to the improvement of the hematocrit, EPO treatment promoted a partial preservation of adipose tissue while exerting negligible effects on muscle loss. Administration of EPO to tumor-bearing animals resulted in a significant increase of lipoprotein lipase (LPL) activity in adipose tissue, suggesting that the treatment favored triacylglycerol (TAG) accumulation in the adipose tissue. In vitro experiments using both adipose tissue slices and 3T3-L1 adipocytes suggests that EPO is able to increase the lipogenic rate through the activation of its specific receptor (EPOR). This metabolic pathway, in addition to TAG uptake by LPL, may contribute to the beneficial effects of EPO on fat preservation in cancer cachexia.

12073 Background: Cancer cachexia affects a large percentage of advanced cancer patients. It’s defined by a consensus definition of unintentional >5% body weight loss over six months. There is no standard way of assessing severity of cancer cachexia. We developed a novel cancer cachexia staging system based on routine clinical parameters. Methods: In a prospective case control study of newly diagnosed cancer patients to identify biomarkers of cancer cachexia, cases were patients with stage III/IV cancer and >5% body weight loss and serum albumin of <3.5g/dl. Controls were patients with stage I-III without weight loss and serum albumin of ≥3.5g/dl. Patients were prospectively followed up between April 2020 and August 2024 with blood biomarkers, anthropometric measurements and radiological parameters. Utilizing data from cases only a novel cancer cachexia staging system was developed called (University of Texas) UT Cancer Cachexia Staging System using 4 clinical parameters namely body mass index (BMI), serum albumin (Alb), neutrophil to lymphocyte ration (NLR) and resting heart rate (RHR). Using quartiles as cut off for each of these four variables, patients were divided into three groups and given a score of 0.5, 1.5 or 2.5 (Table). The cumulative score of each patient was calculated based on individual values of these 4 variables at the time of diagnosis and then categorized into stage I (≤5), Stage II (5-7) or Stage III (>7) cancer cachexia. Kaplan-Meier survival curves were generated for patients in each stage. The univariable Cox regression model was used to compare hazard ratios across the 3 stages. The multivariable Cox regression model was employed to compare hazard ratios between the stages, adjusting for other key demographic and clinical covariates. Results: A total of 109 patients were enrolled in the cachexia group (Male=69, Females=40, Median age = 69 years). The cancer types included Lung cancer (n=50), GI cancers (n=41) and other cancers (n= 18). There were 49 patients (45%) patients with stage I cachexia, 40 (36%) with stage II and 20 (18%) with stage III cachexia. Median overall survival (OS) for patients with stage I cancer cachexia was 11.4 months, for stage II 6.5 months and for stage III 3.5 months. In univariate cox-regression model the difference in hazard ratio between stage I and stage II patients was statistically significant (p=0.004) as was between stage I and stage III (P =0.007). In multi-variable Cox-regression model controlling for age, gender and cancer type, patients with stage II and III cancer cachexia had significantly worse outcome as compared to patients with stage I cancer cachexia. Conclusions: UT cancer cachexia staging system represents a novel staging system which should be validated on a larger data set. Once validated this can help guide clinical management as well as clinical research in patients with cancer cachexia. Development of cancer cachexia staging system based on BMI, albumin, NLR and RHR by using quartiles as cutoff points in the case group (n=109). Score=0.5 Score=1.5 Score=2.5 Variable Cutoff Number of patients Cutoff Number of patients Cutoff Number of patients BMI ≥29 26 21-29 56 <21 26 Albumin ≥3.2 30 2.3-3.2 60 <2.3 18 NLR <3 30 3-8 50 >8 28 RHR * <73 25 73-95 57 >95 26 UT cancer cachexia stage groups defined by using cutoff points for total cancer cachexia score. Stage I <5 Stage II 5-7 Stage III >7

Simple SummaryApproximately half of all patients with advanced cancer experience cachexia, and the prevalence rises above 80% in the last weeks of life. Cancer cachexia (CC) is characterised by anorexia, systemic inflammation, ongoing loss of muscle mass, and weight loss, affecting the quality of life. Different treatments are proposed to manage CC, and comprehensive treatment requires a multidisciplinary approach aimed at evaluating overall patients’ conditions and relieving the symptoms, including psycho-social and spiritual functions. Key elements in CC management are personalized, multi-targeted, and multimodal interventions, but it is hard for some patients to follow programs based on several components. We examined the feasibility of a bimodal intervention, including a psycho-educational component and exercises, to support patients and their caregivers in managing CC. Our prospective mixed-methods pilot study explored feasibility data, changes in PROMS and performance outcomes over time, and qualitative data from dyads and healthcare professionals’ interviews. Background: Key elements in cancer cachexia (CC) management are personalized and multimodal interventions, but it is hard for some patients to follow programs based on several components. We examined the feasibility of a bimodal intervention, including a psycho-educational component and exercises, to support patients and their caregivers in managing CC; Methods: Prospective mixed-methods pilot study explored feasibility data, changes in patient-reported outcomes, and performance outcomes over time in a convenient sample of 30 consecutive CC patients and their caregivers. Results: Twenty-four dyads consented to participate. Twenty dyads received at least two psycho-educational sessions, so the psycho-educational component was feasible for 83.3% of the sample. Six dyads participated in at least fourteen out of twenty-seven rehabilitation sessions, so the exercise program was feasible for 25.0% of the sample. Six dyads showed compliance greater than 50% for both components of the bimodal intervention. Conclusions: While we did not meet our primary feasibility endpoint and had mixed acceptability, our experience provides insight into the challenges and lessons learned in implementing a primary palliative care intervention for CC. More robust studies are needed to help clinicians understand the best exercise program for CC patients, to be included in a multimodal intervention.

β-hydroxy-β-methylbutyrate (HMB), a leucine metabolite, improves muscle mass and function. This study aimed at evaluating the effects of HMB administration in an experimental in vivo model of cancer cachexia (CC). Wistar rats were randomized to receive standard or 4% HMB-enriched chow. Rats from both groups were randomized to receive an i.p. inoculum of AH-130 cells (TB). All rats were weighed and sacrificed at day 24. Liver, heart and muscles were dissected and weighed. The protein levels of p-p70S6k, p-eIf2α, p-mTOR and p-4-EB-P1 were evaluated by Western blotting on gastrocnemius muscle (GSN). As expected, the growth of the AH-130 ascites hepatoma induced significant carcass weight and GSN muscle loss. HMB treatment significantly increased GSN and heart weight in controls (p=0.002 and p<0.001, respectively). In HMB-treated TB, body weight was not lost but significantly (p=0.003) increased, and GSN loss was significantly (p=0.04) attenuated with respect to TB. Phosphorylated eIF2α markedly decreased in TB-rats vs. C. Feeding the HMB-enriched diet resulted in decreased p-eIF2α levels in control animals, while no changes could be observed in the TB group. Phosphorylated p70S6K and phosphorylated mTOR were markedly increased by HMB treatment in controls and further increased in TB. Phosphorylated 4-EB-P1 was markedly increased in TB but substantially unaffected by HMB treatment. Administration of HMB attenuates body weight and muscle loss in experimental CC. Increased phosphorylation of key anabolic molecules suggests that these actions are mediated by improved protein anabolism in muscle.

BackgroundIn patients with cancer, unintentional weight loss and cancer-associated cachexia (CAC) reduce overall survival and impair the quality of life. Because of insulin’s anabolic effects, insulin resistance could contribute to CAC progression. However, the role of insulin resistance in CAC remains unclear, and this study aimed to investigate the association between insulin resistance and CAC. Addressing this knowledge gap may help identify treatable targets to improve patient outcomes.MethodsWe performed a systematic review and meta-analysis. By including studies reporting both fasting levels of circulating insulin and glucose in patients with cancer and CAC according to the internationally accepted CAC definition, we calculated the HOMA-IR (Homeostatic Model Assessment for Insulin Resistance) index to estimate the level of insulin resistance (defined as HOMA-IR above 2.0) in patients with CAC. A subgroup analysis was conducted from studies reporting a HOMA-IR index both from a group of patients with CAC and a group without CAC (nonCAC).ResultsSeventeen studies were included, with a total of 197 patients. The mean HOMA-IR of all studies was 1.84 (95% confidence interval [CI]: 1.77–1.91). Twelve studies found HOMA-IR below 2.0. Five of the 17 studies also reported HOMA-IR from a group of patients with cancer without CAC. We observed a mean difference of −0.42 (95% CI: −2.24 to 1.40) in favour of a lower HOMA-IR in patients with CAC compared to nonCAC, and thus no statistically significant difference between the groups.InterpretationThis systematic review suggests no clear association between insulin resistance and CAC. However, the limited sample sizes and study heterogeneity highlight the need for larger, longitudinal investigations.

Cachexia is a systemic condition that occurs during many neoplastic diseases, such as cancer. Cachexia in cancer is characterized by loss of body weight and muscle and by adipose tissue wasting and systemic inflammation. Cancer cachexia is often associated with anorexia andincreased energy expenditure. Even though the cachectic condition severely affects skeletal muscle, a tissue that accounts for ~40% of total body weight, it represents a multi-organ syndrome that involves tissues and organs such as white adipose tissue, brown adipose tissue, bone, brain, liver, gut and heart. Indeed, evidence suggests that non-muscle tissues and organs, aswell as tumour tissues, secrete soluble factors that act on skeletal muscle to promote wasting. In addition, muscle tissue also releases various factors that can interact with the metabolism of other tissues during cancer. In this Review, we examine the effect of non-muscle tissues and inter-tissue communication in cancer cachexia and discuss studies aimed at developing novel therapeutic strategies for the condition.

Nivolumab is effective against advanced gastric cancer (AGC) refractory to or in patients intolerant of standard chemotherapy. This study was designed to clarify the impact of cancer cachexia in patients with AGC who received nivolumab. We recruited AGC patients who were treated with nivolumab from October 2017 to December 2019. Clinical outcomes were compared between patients with and without cancer cachexia at the start of nivolumab. Cancer cachexia was defined as weight loss >5%; weight loss >2% and body mass index (BMI) <20; or sarcopenia and BMI <20. Primary endpoints were median overall survival (OS) and median time to treatment failure (TTF), while secondary endpoints were overall response rate (ORR) and incidence of adverse events. The study enrolled 44 patients. Median OS and TTF were significantly shorter in patients with cancer cachexia than in those without cancer cachexia (OS: 6.6 vs. 2.3 months; HR=2.65; 95%CI=1.28-5.49; p=0.008, TTF: 2.6 vs. 1.9 months; HR=2.17; 95%CI=1.09-4.32, p=0.027). On Cox proportional hazards analysis, cancer cachexia was significantly associated with shorter OS. The incidence of adverse events did not differ between the two groups. Nivolumab was associated with better OS and TTF outcomes in AGC patients without cachexia than in those with cachexia, albeit there was no difference in the incidence of adverse events. Cancer cachexia may be associated with worse clinical outcomes in patients with AGC treated with nivolumab.

Integrative metabolic profiling of hypothalamus and skeletal muscle in a mouse model of cancer cachexia.

The main features of cancer cachexia include skeletal muscle atrophy, which can significantly reduce the quality of life of patients. Clinical treatment of cancer cachexia is mainly based on nutritional therapy and physical exercise; medication only improves appetite but does not reverse the symptoms of skeletal muscle wasting. In this work, we systematically studied the underlying molecular mechanisms by which cucurbitacin IIb (CuIIb) ameliorates muscle wasting in cancer cachexia both in vitro and in vivo. CuIIb significantly ameliorated the chief features of cancer cachexia in vivo, alleviating weight loss, food intake, muscle wasting, adipose tissue depletion, and organ weight reductions. In vitro, CuIIb (10 and 20 μM) dose-dependently attenuated conditioned medium (CM)-induced C2C12 myotube atrophy. Collectively, our findings demonstrated that CuIIb prevented the upregulation of the E3 ubiquitin ligase muscle atrophy Fbox protein (MAFbx), myosin heavy chain (MyHC), and myogenin (MyoG) and impacted protein synthesis and degradation. In addition, CuIIb decreased the phosphorylation of Tyr705 in STAT3 by regulating the IL-6/STAT3/FoxO pathway to reduce skeletal muscle atrophy in cancer cachexia.

Skeletal muscle atrophy in cancer cachexia is mediated by the interaction between muscle stem cells and various tumor factors. Although Notch signaling has been known as a key regulator of both cancer development and muscle stem cell activity, the potential involvement of Notch signaling in cancer cachexia and concomitant muscle atrophy has yet to be elucidated. The murine K7M2 osteosarcoma cell line was used to generate an orthotopic model of sarcoma-associated cachexia, and the role of Notch signaling was evaluated. Skeletal muscle atrophy was observed in the sarcoma-bearing mice, and Notch signaling was highly active in both tumor tissues and the atrophic skeletal muscles. Systemic inhibition of Notch signaling reduced muscle atrophy. In vitro coculture of osteosarcoma cells with muscle-derived stem cells (MDSCs) isolated from normal mice resulted in decreased myogenic potential of MDSCs, while the application of Notch inhibitor was able to rescue this repressed myogenic potential. We further observed that Notch-activating factors reside in the exosomes of osteosarcoma cells, which activate Notch signaling in MDSCs and subsequently repress myogenesis. Our results revealed that signaling between tumor and muscle via the Notch pathway may play an important role in mediating the skeletal muscle atrophy seen in cancer cachexia.

PurposeAlthough cancer cachexia is mainly characterized by persistent loss of body weight (BW), usually in response to a malignancy, the pathophysiology of cachexia remains unresolved. To elucidate the relationship between the loss of BW and other related clinical factors, we conducted a nationwide, multi-institutional, prospective, observational study in patients with advanced non-small cell lung cancer (NSCLC).MethodsTreatment-naïve stage IV NSCLC patients with an Eastern Cooperative Oncology Group performance status (PS) of 0–2 were eligible. BW, handgrip strength (HGS), quality of life (QOL), Karnofsky Performance Scale (KPS), biochemical parameters, and survival were evaluated at baseline and every 4 weeks for 1 year. The relationship between BW loss and other factors was examined by linear regression analysis. Estimated survival curves were drawn by the Kaplan-Meier method and applied by the log-rank test. Clinical factors associated with cancer cachexia were identified through principal component analysis. The generalized estimating equation approach was used to analyze the deterioration of QOL resulting from the progression of cachexia.ResultsA total of 406 patients were analyzed. BW loss was significantly associated with worsening of QOL, HGS, KPS, and biochemical parameters. The incidence of BW loss was observed throughout the study period. Overall survival was significantly shorter in patients as BW loss progressed. BW loss, decrease in HGS, anorexia, and fatigue were identified as core factors of cachexia that contributed to the deterioration of QOL.ConclusionBW loss most likely deteriorated QOL and shortened survival in patients with advanced NSCLC and should be closely monitored.Electronic supplementary materialThe online version of this article (doi:10.1007/s00520-016-3156-8) contains supplementary material, which is available to authorized users.