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Editor's note: Find the latest COVID-19 news and guidance in Medscape's Coronavirus Resource Center. A systematic review suggests at least one third of SARS-CoV-2 infections occur in people who never develop symptoms, providing strong evidence for the prevalence of asymptomatic infections. The finding that nearly one in three infected people remain symptom-free suggests testing should…

Combining an EGFR inhibitor with a pair of checkpoint inhibitors can produce "promising" activity in certain patients with colorectal cancer (CRC), according to an investigator from a phase 2 trial. The trial was designed to test the combination of panitumumab, ipilimumab, and nivolumab in patients with previously treated, unresectable and/or metastatic, microsatellite stable or mismatch…

The TOI-178 planetary system, a 7.1-billion-year-old system of six planets in the super-Earth to mini-Neptune range, five of which are locked in a rare rhythm around their parent star, could provide important clues about how planets form and evolve. An artist’s impression of the TOI-178 system. Image credit: L. Calçada / ESO / Spaceengine.org. TOI-178…