Melanoma is the third most common type of skin cancer, characterized by its heterogeneity and propensity to metastasize to distant organs. Melanoma is a heterogeneous tumor, composed of genetically divergent subpopulations, including a small fraction of melanoma-initiating cancer stem-like cells (CSCs) and many non-cancer stem cells (non-CSCs). CSCs are characterized by their unique surface proteins associated with aberrant signaling pathways with a causal or consequential relationship with tumor progression, drug resistance, and recurrence. Melanomas also harbor significant alterations in functional genes (BRAF, CDKN2A, NRAS, TP53, and NF1). Of these, the most common are the BRAF and NRAS oncogenes, with 50% of melanomas demonstrating the BRAF mutation (BRAF^V600E). While the successful targeting of BRAF^V600E does improve overall survival, the long-term efficacy of available therapeutic options is limited due to adverse side effects and reduced clinical efficacy. Additionally, drug resistance develops rapidly via mechanisms involving fast feedback re-activation of MAPK signaling pathways. This article updates information relevant to the mechanisms of melanoma progression and resistance and particularly the mechanistic role of CSCs in melanoma progression, drug resistance, and recurrence.

This study aimed to compile all the relevant studies of patients presenting with pericardial tamponade before or after diagnosis of lymphoma, describe the clinical presentations of patients with lymphoma and cardiac tamponade, and assess the difference in overall survival based on the timing of...

Melanoma frequently harbors genetic alterations in key molecules leading to the aberrant activation of PI3K and its downstream pathways. Although the role of PI3K/AKT/mTOR in melanoma progression and drug resistance is well documented, targeting the PI3K/AKT/mTOR pathway showed less efficiency in clinical trials than might have been expected, since the suppression of the PI3K/mTOR signaling pathway-induced feedback loops is mostly associated with the activation of compensatory pathways such as MAPK/MEK/ERK. Consequently, the development of intrinsic and acquired resistance can occur. As a solid tumor, melanoma is notorious for its heterogeneity. This can be expressed in the form of genetically divergent subpopulations including a small fraction of cancer stem-like cells (CSCs) and non-cancer stem cells (non-CSCs) that make the most of the tumor mass. Like other CSCs, melanoma stem-like cells (MSCs) are characterized by their unique cell surface proteins/stemness markers and aberrant signaling pathways. In addition to its function as a robust marker for stemness properties, CD133 is crucial for the maintenance of stemness properties and drug resistance. Herein, the role of CD133-dependent activation of PI3K/mTOR in the regulation of melanoma progression, drug resistance, and recurrence is reviewed.

Undergraduate research (UR) and problem-based learning (PBL) sessions are similar with respect to the type of skills gained through each. However, appropriate modification of PBL sessions would contribute to enhanced UR experience. Based on personal experience in UR and a PBL curriculum, in this short discourse I shall explain how studying under a PBL curriculum enabled me to gain more out of my research experience.

Background: Preexisting alteration of the immune system by factors including older age, cardiovascular diseases, morbid obesity, diabetes, and chronic obstructive pulmonary disease (COPD) have detrimental effects on SARS-CoV-2 patients. Literature regarding SARS-CoV-2/human immunodeficiency virus (HIV) is still developing. Materials and Methods: We reviewed the existing literature pertaining to SARS-CoV-2/HIV coinfection systematically. Research records’ characteristics and patients’ clinical data were collected. Results: Seven research records were included, of which three were case series and four were case reports, reporting a total of 16 cases. There was one case of death, whereas (15/16) patients were discharged home. Majority of patients developed consistent clinical presentation of SARS-CoV-2. All patients had initial positive RT-PCR results, and four cases had HIV-related lymphopenia. Conclusion: Although the current literature is still growing to increase our understanding of SARS-CoV-2/HIV coinfection, people living with HIV should adhere to the guidelines of healthy behavior and practice during this pandemic.

The purpose of this analysis was to investigate the quantity and quality of medical students’ research output in Gulf Cooperation Council countries to aid in developing strategies to improve research output. Abstracts presented by medical students in Gulf Cooperation Council countries were subject to analysis. Abstracts that propagated into full-length articles underwent further demographic analysis, in which data regarding the type of study, the field of study, country of origin, mode of presentation, and journal’s impact factor were collected. A total of 798 abstracts were surveyed, with 19% (n=155) of the abstracts submitted by Gulf Cooperation Council countries progressing into full-length publications. The average impact factor for Gulf Cooperation Council country publications was found to be 1.85 ± 0.26 (standard error). Countries that recorded the highest conversion rates were, in descending order, Kingdom of Saudi Arabia, United Arab Emirates, Oman, Bahrain, and Kuwait. Moreover, basic biomedical and clinical research topics were more likely to be published in comparison with community-oriented and medical education-related topics. Effective efforts to encourage more medical student research output in the Gulf Cooperation Council countries (with a focus on qualitative analysis) should be promoted in order to achieve publication rates comparable with those reported by developed countries.