The Role of Exercise in Cancer-Related Sarcopenia and Sarcopenic Obesity

One of the most common adverse effects of cancer and its therapeutic strategies is sarcopenia, a condition which is characterised by excess muscle wasting and muscle strength loss due to the disrupted muscle homeostasis. Moreover, cancer-related sarcopenia may be combined with the increased deposition of fat mass, a syndrome called cancer-associated sarcopenic obesity. Both clinical conditions have significant clinical importance and can predict disease progression and survival. A growing body of evidence supports the claim that physical exercise is a safe and effective complementary therapy for oncology patients which can limit the cancer- and its treatment-related muscle catabolism and promote the maintenance of muscle mass. Moreover, even after the onset of sarcopenia, exercise interventions can counterbalance the muscle mass loss and improve the clinical appearance and quality of life of cancer patients. The aim of this narrative review was to describe the various pathophysiological mechanisms, such as protein synthesis, mitochondrial function, inflammatory response, and the hypothalamic-pituitary-adrenal axis, which are regulated by exercise and contribute to the management of sarcopenia and sarcopenic obesity. Moreover, myokines, factors produced by and released from exercising muscles, are being discussed as they appear to play an important role in mediating the beneficial effects of exercise against sarcopenia.

The role of E-cadherin in low-grade ductal breast tumourigenesis

Grade I invasive ductal breast carcinomas have a specific pattern of genetic aberrations, namely gain of 1q and loss of 16q. This pattern is very similar to the changes seen in invasive lobular breast carcinomas (ILCs). The gene on 16q involved in ILC is known to be E-cadherin (CDH1). This study has investigated whether the same gene is responsible for grade I invasive ductal carcinoma (IDC), using allele imbalance analysis, mutation screening, and immunohistochemistry (IHC). The data suggest that despite the shared pattern of genetic aberrations seen in grade I IDC and ILC, CDH1 is not the target gene in low-grade ductal tumourigenesis.

Avascular necrosis of bone: the hidden risk of glucocorticoids used as antiemetics in cancer chemotherapy

The role of antiemetics is invaluable in allowing cancer patients to complete otherwise potentially intolerable chemotherapy. Corticosteroids have an established place in the prevention and treatment of nausea and vomiting due to emetogenic cytotoxic agents. Avascular necrosis of bone is a recognised complication of glucocorticoid treatment--the risk of this increasing with higher doses and longer duration of use. This report details a case of bilateral avascular necrosis of the femoral heads in a patient receiving 'standard' doses of dexamethasone as part of the antiemetic regimen used in cisplatin-based combination chemotherapy.

Multiple ways of silencing E-cadherin gene expression in lobular carcinoma of the breast

The cell-cell adhesion receptor gene E-cadherin (CDH1) is expressed by epithelial cells, in which it mediates adhesion and morphogenesis. Invasive lobular carcinoma (ILC) characteristically infiltrates diffusely as single cells; by immunohistochemistry, many of these tumours lack E-cadherin expression. In the present study we investigated various ways in which loss of function of the E-cadherin gene could occur in ILCs, namely, promoter methylation, mutation and allelic loss. We analysed 22 ILCs and found 12 (55%) E-cadherin-negative samples by immunohistochemical analysis. Methylation-specific polymerase chain reaction (PCR) showed that 17/22 (77%) of these tumours had methylation of the CDH1 promoter, including 11/12 (91%) of the E-cadherin-negative tumours. All 16 exons of E-cadherin (including intron-exon boundaries) were amplified from chromosomal DNA and screened for mutations by conformation-sensitive gel electrophoresis (CSGE). Bands with altered mobility were analysed by direct sequencing. We identified five frameshift mutations, which resulted in downstream stop codons and one splice site mutation in six different tumours (29%). Loss of heterozygosity (LOH) was assessed using microsatellite markers, and 9/18 (50%) informative tumours showed LOH. We conclude that most ILCs show genetic or epigenetic changes affecting the E-cadherin gene and that many of these tumours lack E-cadherin expression. In all cases in which there was loss of expression, this was consistent with biallelic inactivation of CDH1 by promoter methylation, mutation or allelic loss in any combination.

Antiemetic efficacy of high-dose metoclopramide and dexamethasone in patients receiving cisplatin chemotherapy: a randomized trial

In a prospective randomized trial we compared the antiemetic efficacy of metoclopramide (MCP) and dexamethasone (DXM). A total of 172 patients receiving chemotherapy based on cisplatin 100 mg/m2/day were randomly allocated to four groups. CP was administered in 5 doses of 1.5 mg/kg (group A), 2 mg/kg (group C), or combined with 4 doses of DXM 4 mg/6 h (MCP: 1.5 mg/kg in group B; 2 mg/kg in group D). Vomiting was decreased in the DXM groups compared to groups A and C (p < 0.002), and the duration of nausea was greater in group A than in group D (P < 0.004). A greater disturbance in appetite was observed in group A compared to groups B (p < 0.028), D(p < 0.001) and C (p < 0.045). Activity problems were greater in group A than in C (p < 0.003) and D(p < 0.005). We noticed that a small increase in MCP (0.5 mg/kg) did not influence the antiemetic effect. The addition of DXM did not significantly alter the antiemetic results at the lower MCP dose, but improved them when MCP was slightly increased. We conclude that DXM slightly improves the antiemetic effect of MCP and the effects are related to the MCP dose.