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  • Author: Peter E Clark x
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Derek Raghavan, Antoinette R Tan, E Shannon Story, Earle F Burgess, Laura Musselwhite, Edward S Kim and Peter E Clark

Substantial management changes in endocrine-related malignancies have been required as a response to the COVID-19 pandemic, including a draconian reduction in the screening of asymptomatic subjects, delay in planned surgery and radiotherapy for primary tumors deemed to be indolent, and dose reductions and/or delays in initiation of some systemic therapies. An added key factor has been a patient-initiated delay in the presentation because of the fear of viral infection. Patterns of clinical consultation have changed, including a greater level of virtual visits, physical spacing, masking, staffing changes to ensure a COVID-free population and significant changes in patterns of family involvement. While this has occurred to improve safety from COVID-19 infection, the implications for cancer outcomes have not yet been defined. Based on prior epidemics and financial recessions, it is likely that delayed presentation and treatment of high-grade malignancy will be associated with worse cancer outcomes. Cancer patients are also at increased risk from COVID-19 infection compared to the general population. Pandemic management strategies for patients with tumors of breast, prostate, thyroid, parathyroid and adrenal gland are reviewed.

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Goswin Y Meyer-Rochow, Nicole E Jackson, John V Conaglen, Denis E Whittle, Muthusamy Kunnimalaiyaan, Herbert Chen, Gunnar Westin, Johanna Sandgren, Peter Stålberg, Elham Khanafshar, Daniel Shibru, Quan-Yang Duh, Orlo H Clark, Electron Kebebew, Anthony J Gill, Rory Clifton-Bligh, Bruce G Robinson, Diana E Benn and Stan B Sidhu

MicroRNAs (miRNAs) are small RNAs (∼22 bp) that post-transcriptionally regulate protein expression and are found to be differentially expressed in a number of human cancers. There is increasing evidence to suggest that miRNAs could be useful in cancer diagnosis, prognosis, and therapy. We performed miRNA microarray expression profiling on a cohort of 12 benign and 12 malignant pheochromocytomas and identified a number of differentially expressed miRNAs. These results were validated in a separate cohort of ten benign and ten malignant samples using real-time quantitative RT-PCR; benign samples had a minimum follow-up of at least 2 years. It was found that IGF2 as well as its intronic miR-483-5p was over-expressed, while miR-15a and miR-16 were under-expressed in malignant tumours compared with benign tumours. These miRNAs were found to be diagnostic and prognostic markers for malignant pheochromocytoma. The functional role of miR-15a and miR-16 was investigated in vitro in the rat PC12 pheochromocytoma cell line, and these miRNAs were found to regulate cell proliferation via their effect on cyclin D1 and apoptosis. These data indicate that miRNAs play a pivotal role in the biology of malignant pheochromocytoma, and represent an important class of diagnostic and prognostic biomarkers and therapeutic targets warranting further investigation.