How to pronounce “concerningly” in English

Dr. Irving Selikoff was running a small clinic in Patterson, New Jersey, when the local asbestos workers Union asked if their members could come and see him.Before long, he'd seen multiple workers with either severe lung scarring or more concerningly, an extremely rare cancer called mesothelioma.- A mesothelioma is strongly associated with asbestos exposure and is cancer of those cells lining the inside