SCWD Publications Digest

Cancer is often associated with cachexia, a wasting syndrome which is multifactorial and cannot be resolved with simple nutritional aid. It causes loss of muscle mass and is the cause of death for almost a third of cancer patients. However, cachexia is very complex. This muscle-wasting disorder has many underlying mechanisms, whether cancer-induced or chemotherapy induced. Heighted protein catabolism and reduced anabolism, as well as disrupted energy metabolism, are associated with cachexia, but the mechanisms underlying these changes are not fully known. Inflammation and oxidative stress are believed to be important within the mechanisms.
This review by Huot J et al. aimed to evaluate the mechanisms underlying cancer cachexia, particularly discussing the role of oxidative stress.

Recent studies have identified energy dysregulation as one of the principle drivers of frailty. Exercise, the most effective tool to combat frailty, is associated with energy metabolism upregulation and reduction of inflammation. It has been hypothesised this therapeutic effect is linked to the production of myokines by skeletal muscle in response to acute and chronic exercise. Evidence has concluded that myokines play a crucial role in upholding energy metabolism and combating inflammation. However, despite this, only a limited number of studies have examined the changes in myokine concentrations with exercise in older adults.

This review aims to summarise evidence supporting an association between energy metabolism and frailty. It also assesses the role of myokines, released during exercise, in combating frailty.

Cancer cachexia is a wasting disorder, where nutritional interventions cannot fully aid in restoring weight in patients. It severely impacts quality of life and survival rates of patients. In this study, a 58-question questionnaire was completed by clinicians to understand the knowledge and practice gaps within the treatment of cancer cachexia. Some issues raised included the lack of a standardised definition of cancer cachexia for diagnosis, with 43% of respondents stating that low levels of attention are given to providing such a diagnosis. Furthermore, it was reported that screening for cachexia was not completed routinely, among other practice gaps.
This review by Baracos VE et al. aimed to highlight the gaps in understanding of cancer cachexia that clinicians face worldwide.

For patients with advanced-stage cancer, weight loss and lower body mass index has been associated with shorter rates of survival. On the other hand, obesity has been associated with longer survival. Weight loss or cachexia could therefore be used as a prognostic tool, although it has not yet been studied much in clinical trials. It is predicted to be due to the fact that decreased muscle mass is a predictor of shortened survival, as well as lowered nutrient stores and activity level. However, further research is required into understanding weight loss in relation to cancer survival rates, especially in the context of therapies such as chemotherapy, as it is not fully known how this interacts with body mass.
This review by Oswalt C et al. aimed to explore the relationship between body mass index, weight loss and survival rates in advanced lung cancer.

Globally, there are over 1.5 million new cases of gastric and oesophageal cancer annually. These cases (especially advanced cases) are often associated with cancer cachexia, a multifactorial syndrome that leads to progressive wasting which cannot be fully reverse through nutritional interventions. It is also responsible for around 20% of cancer deaths. Yet, the understanding of cancer cachexia is often neglected in treatment. This presents an issue as cytotoxic drug doses are most commonly calculated based on body surface area, not taking into account decreasing mass.
Furthermore, understanding cancer cachexia would allow for the improvement of therapeutic options, which are currently little researched, including exercise- and nutrition-based interventions, as well as targeted treatments such as anti-IL1 α and anti-GDF-15. Even for patients with incurable cancers, the management of cachexia wasting can improve quality of life.
This review by Brown LR et al. aimed to highlight the necessity of understanding the progression of cancer cachexia in association with diseases such as gastric and oesophageal cancer, as well as the possible future research directions associated with aiding in these conditions.