The investigation of the frequency of COVID-19 in patients with a history of stroke.

Introduction: The emergence of the coronavirus in 2019 became a global epidemic disease. According to the World Health Organization, people with a history of chronic diseases such as brain stroke are among the main groups at risk of contracting COVID-19. Therefore, this study was performed with the aim of the determination amount of the frequency of contracting COVID-19 in stroke patients. Materials and Methods: This descriptive-analytical study was conducted on 100 patients with a history of stroke referred to Imam Hossein Hospital in Tehran (Iran) between 2019 and 2022, which had all the inclusion criteria in the study. The demographic information including (gender, weight, height) and clinical information was collected by a researcher-made questionnaire and analyzed by SPSS version 24 software. Results: The average age of the studied patients was 63 years. Among them, 53 people (53%) were infected with COVID-19. The most of underlying diseases were related to high blood pressure. All cases of stroke in patients with COVID-19 were associated with thrombotic type, and half of the other cases included involvement in large cerebral vessels. Lymphocyte count, CRP, and ESR levels were relatively higher in stroke patients with COVID-19, but there were observed no cases of pleural effusion and pericardial effusion associated with COVID-19 in stroke patients. In all of the patients with COVID-19, pulmonary involvement was observed in the Peripheral/Perihillar area. Discussion and Conclusion: According to the results and data of this research, the probability of infecting COVID-19 is higher in people with a history of stroke, and these patients have more severe strokes and more mortality than stroke patients without contracting COVID-19.

The Potential Role of Intestinal Stem Cells and Microbiota for the Treatment of Colorectal Cancer.

Colorectal cancer is a global health concern with high incidence and mortality rates. Conventional treatments like surgery, chemotherapy, and radiation therapy have limitations in improving patient survival rates. Recent research highlights the role of gut microbiota and intestinal stem cells in maintaining intestinal health and their potential therapeutic applications in colorectal cancer treatment. The interaction between gut microbiota and stem cells influences epithelial self-renewal and overall intestinal homeostasis. Novel therapeutic approaches, including immunotherapy, targeted therapy, regenerative medicine using stem cells, and modulation of gut microbiota, are being explored to improve treatment outcomes. Accordingly, this chapter provides an overview of the potential therapeutic applications of gut microbiota and intestinal stem cells in treating colorectal cancer.

DNA Damage Responses, the Trump Card of Stem Cells in the Survival Game.

Stem cells, as a group of undifferentiated cells, are enriched with self-renewal and high proliferative capacity, which have attracted the attention of many researchers as a promising approach in the treatment of many diseases over the past years. However, from the cellular and molecular point of view, the DNA repair system is one of the biggest challenges in achieving therapeutic goals through stem cell technology. DNA repair mechanisms are an advantage for stem cells that are constantly multiplying to deal with various types of DNA damage. However, this mechanism can be considered a trump card in the game of cell survival and treatment resistance in cancer stem cells, which can hinder the curability of various types of cancer. Therefore, getting a deep insight into the DNA repair system can bring researchers one step closer to achieving major therapeutic goals. The remarkable thing about the DNA repair system is that this system is not only under the control of genetic factors, but also under the control of epigenetic factors. Therefore, it is necessary to investigate the role of the DNA repair system in maintaining the survival of cancer stem cells from both aspects.

Critical roles of cytokine storm and bacterial infection in patients with COVID-19: therapeutic potential of mesenchymal stem cells.

The severe acute respiratory syndrome coronavirus 2 has been a shocking disaster for healthcare systems worldwide since December 2019. This virus can affect all systems of the body and its symptoms vary from a simple upper respiratory infection to fatal complications including end-organ damage. On the other hand, the normal immune system plays a pivotal role in the recovery of infectious diseases such as COVID-19. However, occasionally, exaggerated immune system inflammation and an excessive synthesis of cytokines, known as a "cytokine storm," can deteriorate the patient's clinical condition. Secondary bacterial co-infection is another problem in COVID-19 which affects the prognosis of patients. Although there are a few studies about this complication, they suggest not using antibiotics commonly, especially broad-spectrum ones. During this pandemic, various approaches and therapeutics were introduced for treating COVID-19 patients. However, available treatments are not helpful enough, especially for complicated cases. Hence, in this era, cell therapy and regenerative medicine will create new opportunities. Therefore, the therapeutic benefits of mesenchymal stem cells, especially their antimicrobial activity, will help us understand how to treat COVID-19. Herein, mesenchymal stem cells may stop the immune system from becoming overactive in COVID-19 patients. On the other side, the stem cells' capacity for repair could encourage natural healing processes.

Application of Biocompatible Scaffolds in Stem-Cell-Based Dental Tissue Engineering.

Tissue engineering as an important field in regenerative medicine is a promising therapeutic approach to replace or regenerate injured tissues. It consists of three vital steps including the selection of suitable cells, formation of 3d scaffolds, and adding growth factors. Mesenchymal stem cells (MSCs) and embryonic stem cells (ESCs) are mentioned as two main sources for this approach that have been used for the treatment of various types of disorders. However, the main focus of literature in the field of dental tissue engineering is on utilizing MSCs. On the other hand, biocompatible scaffolds play a notable role in this regenerative process which is mentioned to be harmless with acceptable osteoinductivity. Their ability in inhibiting inflammatory responses also makes them powerful tools. Indeed, stem cell functions should be supported by biomaterials acting as scaffolds incorporated with biological signals. Naturally derived polymeric scaffolds and synthetically engineered polymeric/ceramic scaffolds are two main types of scaffolds regarding their materials that are defined further in this review. Various strategies of tissue bioengineering can affect the regeneration of dentin-pulp complex, periodontium regeneration, and whole teeth bioengineering. In this regard, in vivo/ex vivo experimental models have been developed recently in order to perform preclinical studies of dental tissue engineering which make it more transferable to be used for clinic uses. This review summarizes dental tissue engineering through its different components. Also, strategies of tissue bioengineering and experimental models are introduced in order to provide a perspective of the potential roles of dental tissue engineering to be used for clinical aims.

Brown adipose tissue and alzheimer's disease.

Alzheimer's disease (AD), the most common type of senile dementia, is a chronic neurodegenerative disease characterized by cognitive dysfunction and behavioral disability. The two histopathological hallmarks in this disease are the extraneuronal accumulation of amyloid-ß (Aß) and the intraneuronal deposition of neurofibrillary tangles (NFTs). Despite this, central and peripheral metabolic dysfunction, such as abnormal brain signaling, insulin resistance, inflammation, and impaired glucose utilization, have been indicated to be correlated with AD. There is solid evidence that the age-associated thermoregulatory deficit induces diverse metabolic changes associated with AD development. Brown adipose tissue (BAT) has been known as a thermoregulatory organ particularly vital during infancy. However, in recent years, BAT has been accepted as an endocrine organ, being involved in various functions that prevent AD, such as regulating energy metabolism, secreting hormones, improving insulin sensitivity, and increasing glucose utilization in adult humans. This review focuses on the mechanisms of BAT activation and the effect of aging on BAT production and signaling. Specifically, the evidence demonstrating the effect of BAT on pathological mechanisms influencing the development of AD, including insulin pathway, thermoregulation, and other hormonal pathways, are reviewed in this article.

The Impact of COVID-19 on Cancer Recurrence: A Narrative Review.

Severe acute respiratory syndrome coronavirus 2 (SARSCoV-2) continues to be a worldwide healthcare problem. While our knowledge of the interaction of cancer and its management with COVID-19 mortality is gradually evolving, there are still many unanswered questions regarding the impact of COVID-19 on cancer and its prognosis. Several factors activated during COVID-19 have been implicated in tumorigenesis and the development of metastasis. Inflammation, hypoxia, reduced levels of angiotensin converting enzyme 2, elevated levels of Interleukin 6 and some other cytokines that are hallmarks of COVID-19 are capable of inducing tumor relapse and metastasis. On the other hand, there are reports that COVID-19 has been associated with cancer cure. Understanding the interaction between COVID-19 and tumor cells is essential for evaluating the potential long-term risks of COVID-19 in cancer patients, and for scheduling necessary preventive and therapeutic interventions. In this review, we briefly overview the potential impacts that COVID-19 might have on tumorigenesis and cancer relapse, as well as the role that COVID-19 might play in cancer remission and cure.

Routine COVID-19 testing may not be necessary for most cancer patients.

Cancer patients are at risk for severe complications or death from COVID-19 infection. Therefore, the need for routine COVID-19 testing in this population was evaluated. Between 1st August and 30th October 2020, 150 cancer patients were included. Symptoms of COVID-19 infection were evaluated. All eligible individuals went through RT-PCR and serological tests for COVID-19. At the same time, 920 non-cancer patients were recruited from a random sample of individuals who were subject to routine molecular and anti-body screening tests. Of 150 cancer patients, 7 (4.7%) were RT-PCR positive. Comorbidity made a significant difference in the RT-PCR positivity of cancer patients, 71.4% positive versus 25.8% negative (P-value = 0.02). The average age for negative and positive groups was 53.3 and 58.2 respectively (P-value = 0.01). No significant difference was observed between cancer and non-cancer patients regarding COVID-19 antibody tests. However, cancer patients were 3 times less likely to have a positive RT-PCR test result OR = 0.33 (CI: 0.15-0.73). The probability of cancer patients having a positive routine test was significantly lower than non-cancer patients, and the concept that all cancer patients should be routinely tested for COVID-19 may be incorrect. Nevertheless, there may be a subgroup of patients with comorbidities or older age who may benefit from routine COVID-19 testing. Importantly, these results could not be subjected to multivariate analysis.

Estrogen Receptor Expression in Glial Tumors of Iranian Patients: A Single Center Experience.

BACKGROUND & OBJECTIVE: Gliomas are the most common type of primary intracranial tumors in adults. The expression of estrogen receptors varies in different grades of glial tumors, and some studies have suggested that this expression might have a prognostic value. It seems that estrogen receptor expression negatively correlates with the histological grade of gliomas. In the present study, we aimed to determine the expression of estrogen receptor in different glial tumors in Iranian patients and to find a possible correlation between its expression and the grade of glial tumors. METHODS: The brain tumors pathology reports from 2014 to 2017 in the Pathology Department of Shohaday-e Tajrish Hospital in Tehran, Iran were evaluated and 104 different gliomas: 79 cases of astrocytoma and 25 cases of oligodendroglioma were selected. All the samples were re-evaluated by a neuropathologist in order to accurately determine the tumor grade. The immunohistochemistry was carried out to detect the expression of estrogen receptor alpha and beta on brain tumors. RESULTS: None of the samples expressed estrogen receptor alpha. In the case of estrogen receptor beta (ERß), all samples showed various degrees of positivity: 9% weak, 40% moderate, and 51% strong expressions. The level of ERß expression was found to be conversely correlated with tumor grade. CONCLUSION: Our study demonstrated that ERß is expressed in the majority (if not all) of the glial tumors and its expression was conversely related to the tumor grade. Because of well-tolerability and acceptable adverse effects, ER agonists might be considered as therapeutic agents for the patients with glial tumors.

The Incidence of Deep Vein Thrombosis in Breast Cancer Patients Receiving Outpatient Cancer Therapy in Iran.

BACKGROUND: Venous thromboembolism (VTE) is one of the main causes of mortality in patients with cancer. This study was conducted to assess the incidence of deep vein thrombosis (DVT) in breast cancer patients receiving outpatient cancer therapy. MATERIALS AND METHODS: This multi-center prospective cohort study was conducted on patients with breast cancer, initiating an outpatient chemotherapy regimen in five medical centers in Iran. Eligible patients were enrolled in the study consecutively between January 2013 and January 2015. The primary outcome was lower extremity DVT based on duplex/doppler ultrasonography two months after the first course of chemotherapy (visit 2) and after the end of the course (visit 3). All patients were followed-up from the onset of chemotherapy until the first occurrence of lower extremity DVT, death, or the end of the course. RESULTS: A total of 427 eligible breast cancer patients were recruited in the study, 403 of whom attended at least one follow-up visit. The mean (SD) duration of follow-up was 4 (1.3) months. During the follow-up, only one patient showed DVT on duplex/doppler ultrasonography in visit 2. Therefore, the two-month and overall cumulative incidence risk of DVT was 0.25% (95% CI: 0.00-0.74%). However, the mean D-dimer level showed no significant change (P>0.05). CONCLUSION: Our findings showed the low risk of DVT in breast cancer patients receiving outpatient cancer therapy.

Effect of Processed Honey and Royal Jelly on Cancer-Related Fatigue: A Double-Blind Randomized Clinical Trial.

BACKGROUND: Cancer-related fatigue (CRF) is experienced by 50% to 90% of cancer patients and can severely affect their quality of life and functional capacity. Several randomized trials have recommended various ways to alleviate the symptoms of CRF with or without recourse to medications. OBJECTIVE: The aim of this study is to evaluate the effectiveness of processed honey and royal jelly on the symptoms of CRF in cancer patients who are undergoing hormone therapy, chemotherapy, chemo-radiation, or radiotherapy. METHODS: Fifty-two participants from the patients who visited the oncology clinic of Shohada-e-Tajrish hospital in Tehran (Iran) between May 2013 and August 2014 were selected and divided into two groups. The study group (26 patients) received processed honey and royal jelly, while the control group received pure honey. Both groups were instructed to consume their 5mL supplement twice daily for 4 weeks. Both groups were assessed at the beginning of the study, after 2 weeks, and then at the end of 4 weeks of treatment. Fatigue was measured using a visual analogue fatigue scale (VAFS) and fatigue severity scale (FSS). The results were compared between the two arms of study, and equality of probability distributions was assessed using a Kolmogorov-Smirnov test. RESULTS: The mean age of the 52 patients was 54.84. After two and four weeks of treatment with processed honey and royal jelly, VAFS and FSS due to treatment was better in the study group than in the control group, and the differences were statistically significant (p<0.001, p<0.001, respectively). CONCLUSION: To the best of our knowledge, our study provided support for the use of processed honey and royal jelly to ameliorate CRF. The positive results of this study warrant further studies in this field. CLINICAL TRIAL REGISTRATION: The study was registered in the Iranian Clinical Trial Registry Center (http://www.irct.ir) with the registration code: IRCT2015081423426N1. FUNDING: The authors received no financial support for the research, authorship, and/or publication of this article.

Efficacy of benzydamine oral rinse in prevention and management of radiation-induced oral mucositis: A double-blind placebo-controlled randomized clinical trial.

AIM: Several studies have demonstrated positive effects of benzydamine oral rinse in prevention of radiation-induced oral mucositis. The aim of this study was to assess the efficacy of this medication in reducing the signs and symptoms of oral mucositis in patients receiving radiotherapy for head and neck cancer. METHODS: Fifty-one patients with head and neck carcinoma 2012 received external beam radiotherapy for 5 days/week to total planned cumulative radiotherapy doses of at least 5000 cGy. Patients were randomized to treatment with either benzydamine oral rinse or placebo, initiated the day before radiotherapy and continued for 2 weeks after the end of treatment. Oral cavity was divided into 14 anatomical sites and relevant sites were examined weekly, with a score given to each site based on the degree of mucositis using a 4-point scale, and then a "mean mucositis score" was calculated. RESULTS: Up to the end of third week, two groups did not show any difference in the severity of mucositis. However, by the end of week 4, the mean score of placebo group was more than that of treatment group (1.81 vs 1.27, P=0.001). This trend continued to end of week 7 (1.98 vs 1.43, P=0.001). CONCLUSION: Benzydamine oral rinse can be considered as an effective, safe and well-tolerated medication for prevention of radiation-induced oral mucositis and alleviating its symptoms.

Attitude of cancer patients toward diagnosis disclosure and their preference for clinical decision-making: a national survey.

OBJECTIVES: There is still contradictory evidence on disclosure preferences regarding cancer diagnosis. The aim of this study was to evaluate the preference of cancer patients for knowing the truth about their disease, as well as the factors that might have an impact on these preferences. METHOD: This study was conducted in 11 cancer centers in Iran. A questionnaire was used to collect data, and all patients above 15 years of age who were willing to participate were included in the study. The patients were asked if they were aware of the malignant nature of their disease, and if they came to know about their disease at the time of initial diagnosis, or later. The patients were then asked about the way they looked upon their disease. In the final part of the questionnaire, the participants were asked the level of involvement they prefer to have in making treatment decisions. RESULTS: In total, 1226 patients were enrolled in this study, only 565 (46.7%) of whom were aware of their disease at the time of diagnosis, and 878 (72.7%) at the time of interview, while 980 (85.2%) were willing to receive information about their disease. Patients' awareness was significantly associated with age under 50 years, female gender, having breast, skin or head and neck cancer, and having medical care in Shiraz or Hamadan while it was not associated with the stage or accompanying illness. CONCLUSION: While the majority of Iranian cancer patients prefer to be aware of the nature of their disease and have an active role in treatment decision making, they do not receive this information.

Quality of life among veterans with war-related unilateral lower extremity amputation: a long-term survey in a prosthesis center in Iran.

OBJECTIVE: To determine the factors that have an adverse effect on the long-term health-related quality of life (HRQOL) of veterans who have lost their extremities on the battlefield. DESIGN: Cross-sectional study. SETTING: Tertiary prosthesis center. PARTICIPANTS: One hundred forty-one male Iranian veterans who have sustained unilateral lower extremity amputation during the Iran-Iraq War (1980-1988) were evaluated after an average of 21.6 years (range, 20-27 years) after amputation. INTERVENTION: No intervention. MAIN OUTCOME MEASUREMENTS: Physical and mental HRQOL according to the Short Form-36 (SF-36) Health Survey. A cutoff point to define poor versus good HRQOL was calculated using the first quartile of SF-36 physical and mental component scores. RESULTS: Poor physical HRQOL was positively associated with transfemoral amputation, phantom movement, low back pain, and a lower Barthel Index [odds ratios (ORs): 4.1, 7.8, 9.1, and 0.9, respectively). Poor mental HRQOL was associated with education level lower than high school diploma and the articular pain of the sound leg (OR = 2.9 and 6.5, respectively). Being employed or receiving disability was a factor that had a lower OR to associate with poor mental HRQOL (OR = 0.2). CONCLUSIONS: Alleviation of complaints such as low back pain and articular pain of the sound leg through appropriate medical management, granting facilities for continuing education, and employment are issues that should be considered by authorities and rehabilitative centers to increase HRQOL in amputee veterans.

A very rare case of single coronary artery anomaly, with left anterior descending and left circumflex arteries originating separately from proximal right coronary artery.

Coronary artery anomalies are rare, with the reported prevalence of 0.2% to 1% in routine angiographic studies. Among them, presence of a single coronary artery is one of the rarest anomalies, comprising less than 3% of all coronary anomalies. In this article we report a case of single coronary artery anomaly with left anterior descending and left circumflex arteries arising separately from proximal right coronary artery, and left anterior descending artery reaching atrioventricular sulcus by passing between aortic and pulmonary artery trunci. The patient underwent off-pump coronary artery bypass grafting and is currently symptom-free.