Rationale: In 2020, lung cancer was the leading cause of cancer deaths and the most common cancer in men. Although obstructive sleep apnea (OSA) has been postulated to be carcinogenic, epidemiological studies are inconclusive. Objectives: To investigate the associations between OSA and the incidence and mortality of lung cancer. Methods: Four electronic databases (PubMed, Embase, Cochrane Library, and Scopus) were searched from inception until 6 June 2021 for randomized controlled trials and observational studies examining the association between sleep apnea and incident lung cancer. Two reviewers selected studies, extracted data, graded the risk of bias using the Newcastle-Ottawa scale and the quality of evidence using the Grading of Recommendations Assessment, Development, and Evaluation system. Random-effects models were used to meta-analyze the maximally covariate-adjusted associations. Results: Seven studies were included in our systematic review, among which four were suitable for meta-analysis, comprising a combined cohort of 4,885,518 patients. Risk of bias was low to moderate. OSA was associated with a higher incidence of lung cancer (hazard ratio, 1.25; 95% confidence interval, 1.02–1.53), with substantial heterogeneity (I 2 = 97%). Heterogeneity was eliminated, with a stable pooled effect size, when including the three studies with at least 5 years of median follow-up (hazard ratio, 1.32; 95% confidence interval, 1.27–1.37; I 2 = 0%). Conclusions: In this meta-analysis of 4,885,518 patients from four observational studies, patients with OSA had an approximately 30% higher risk of lung cancer compared with those without OSA. We suggest more clinical studies with longer follow-up as well as biological models of lung cancer be performed to further elucidate this relationship.

Introduction: Sodium-glucose cotransporter 2 (SGLT2) inhibitors are increasingly utilized in the treatment of diabetes mellitus as well as therapeutic extra-glycemic effects. However, there are still concerns over complications such as amputation events, given the results from the Canagliflozin Cardiovascular Assessment Study (CANVAS) trial. Hence, we conducted a systematic review and meta-analysis of randomized-controlled trials to investigate the effect of SGLT2 inhibitors on amputation events. Methods: Four electronic databases (PubMed, Embase, Cochrane, and SCOPUS) were searched on November 21, 2020, for articles published from January 1, 2000, up to November 21, 2020, for studies that examined the effect of SGLT2 inhibitors on amputation events. Random-effect pair-wise meta-analysis for hazard ratios and fixed-effect Peto odds ratio meta-analysis were utilized to summarize the studies. Results: A total of 15 randomized-controlled trials were included with a combined cohort of 63,716 patients. We demonstrated that there was no significant difference in amputation events across different types of SGLT2 inhibitors, different baseline populations, and different duration of SGLT2 inhibitor use. Discussion/Conclusions: In this meta-analysis, SGLT2 inhibitors were not associated with a significant difference in amputation events.

Ptosis is a common ocular complaint in the elderly population. While most cases are often due to involutional changes in the eyelid, neurogenic, mechanical or myogenic diseases should remain as important differential diagnoses. We report a case of a 75-year-old Chinese man who presented with chronic progressive ptosis and was initially managed as presumed seronegative ocular myasthenia gravis (MG). Despite positive bedside findings suggestive of MG, serological and electrophysiological investigations were inconclusive, and there was no clinical response to pyridostigmine. The diagnosis was achieved only after an opportunistic frontalis muscle biopsy obtained during planned brow lift surgery demonstrated histopathological features supportive of a mitochondrial aetiology. This case highlights the diagnostic challenge of distinguishing mitochondrial myopathies (MM) from ocular MG, emphasises clinical features that should prompt reconsideration of the diagnosis, and illustrates how opportunistic biopsy during oculoplastic surgery may facilitate diagnosis in selected patients with persistent diagnostic uncertainty.