Novel Selenoesters as a Potential Tool in Triple-Negative Breast Cancer Treatment

Disturbing cancer statistics, especially for breast cancer, are becoming a rationale for the development of new anticancer therapies. For the past several years, studies have been proving a greater role of selenium in the chemoprevention of many cancers than previously considered; hence, a trend to develop compounds containing this element as potential agents with anticancer activity has been set for some time. Therefore, our study aimed to evaluate the anticancer activity of novel selenoesters (EDA-71, E-NS-4) in MCF-7 and MDA-MB-231 human breast cancer cells. The assays evaluating proliferation and cell viability, and flow cytometer analysis of apoptosis/autophagy induction, changes in mitochondrial membrane potential, disruption of cell cycle phases, and protein activity of mTOR, NF-κB, cyclin E1/A2, and caspases 3/7, 8, 9, 10 were performed. The obtained results indicate that the tested selenoesters are highly cytotoxic and exhibit antiproliferative activity at low micromolar doses (<5 µM) compared with cisplatin. The most active compound—EDA-71—highly induces apoptosis, which proceeds via both pathways, as evidenced by the activation of all tested caspases. Furthermore, we observed the occurrence of autophagy (↓ mTOR levels) and cell cycle arrest in the S or G2/M phase (↓ cyclin E1, ↑ cyclin A2).

Selenium as a Bioactive Micronutrient in the Human Diet and Its Cancer Chemopreventive Activity

This review answers the question of why selenium is such an important trace element in the human diet. Daily dietary intake of selenium and its content in various food products is discussed in this paper, as well as the effects of its deficiency and excess in the body. Moreover, the biological activity of selenium, which it performs mainly through selenoproteins, is discussed. These specific proteins are responsible for thyroid hormone management, fertility, the aging process, and immunity, but their key role is to maintain a redox balance in cells. Furthermore, taking into account world news and the current SARS-CoV-2 virus pandemic, the impact of selenium on the course of COVID-19 is also discussed. Another worldwide problem is the number of new cancer cases and cancer-related mortality. Thus, the last part of the article discusses the impact of selenium on cancer risk based on clinical trials (including NPC and SELECT), systematic reviews, and meta-analyses. Additionally, this review discusses the possible mechanisms of selenium action that prevent cancer development.

Investigating psychological problems in caregiver of pediatrics with cancer: A systematic review

PURPOSE

Cancer is a type of chronic illness that causes many issues for patients and their caregivers, including a wide range of psychological problems. This study was conducted to determine the status and psychological problems of caregivers of pediatric patients with cancer who live in Iran.

METHODS

All articles from 2000 to March 2019 related to the psychological of caregivers and their child's cancer were included in the search. Domestic websites in Iran and international databases were searched. Keywords of the search included child, cancer, malignancy, care burden, stress, anxiety, depression, coping strategies, psychological hardiness, posttraumatic stress, parents, father, mother, and pediatric. The search, data extraction, quality assessment and screening were conducted independently by two researchers.

RESULTS

In the initial search, 345 articles were extracted regarding the psychological problems of caregivers. After final screening 15 articles were selected; from these four referred to care burden, four articles for coping skills, three articles for posttraumatic stress disorder (PTSD) and four articles for stress, anxiety, and depression among carers of children with cancer.

CONCLUSION

Considering the existence of psychological problems such as caregiver burden, PTSD, stress, anxiety, and depression in caregivers of children with cancer, it is necessary to provide nursing interventions for this group of parents; particularly interventions that provide the necessary ground for reducing psychological problems and improving caregivers' mental health.