Effect of COVID-19 on Lungs: Focusing on Prospective Malignant Phenotypes.

Abstract

Simple SummaryAccording to the coronavirus virus resource center of Johns Hopkins Medicine, more than 75 million people are presently affected worldwide, including 1.7 million deaths due to severe acute respiratory syndrome since December 2019. Apart from the common symptoms similar to the common flu, a characteristic computed tomography (CT) feature i.e., Ground Glass Opacity (GGO) is highlighted in this article. GGOs have been observed in COVID-19 patients with severe symptoms including pneumonia in both lungs. It is important to reflect that GGO may indicate the onset of lung fibrosis and may be an indicative feature of high-risk subjects for developing lung cancer. In this article, the causes of the appearance of GGOs and their effects are mainly discussed, along with the brief immunopathogenesis of COVID-19 in comparison with other oncogenic viruses. In this pandemic situation, it is also important to consider the long-term effects of coronavirus infection and the ways to follow-up the patients who recovered from this disease.Currently, the healthcare management systems are shattered throughout the world, even in the developed nations due to the COVID-19 viral outbreak. A substantial number of patients infected with SARS-CoV2 develop acute respiratory distress syndrome (ARDS) and need advanced healthcare facilities, including invasive mechanical ventilation. Intracellular infiltration of the SARS-CoV2 virus particles into the epithelial cells in lungs are facilitated by the spike glycoprotein (S Protein) on the outer side of the virus envelope, a membrane protein ACE2 (angiotensin-converting enzyme 2) and two proteases (TMPRSS2 and Furin) in the host cell. This virus has unprecedented effects on the immune system and induces a sudden upregulation of the levels of different pro-inflammatory cytokines. This can be a cause for the onset of pulmonary fibrosis in the lungs. Existence of a high concentration of inflammatory cytokines and viral load can also lead to numerous pathophysiological conditions. Although it is well established that cancer patients are among the high-risk population due to COVID-19-associated mortality, it is still unknown whether survivors of COVID-19-infected subjects are at high-risk population for developing cancer and whether any biologic and clinical features exist in post-COVID-19 individuals that might be related to carcinogenesis.