The healthcare landscape in Massachusetts is facing a significant upheaval as Steward Health Care, a Texas-based for-profit healthcare chain, plans to lay off nearly 1,250 workers amidst its hospital closures. Boston 25 News reported the upcoming job losses will affect employees at Carney Hospital in Dorchester, with 753 workers being laid off, and at Nashoba Valley Medical Center in Ayer, where another 490 workers will lose their jobs.