Construction is continuing at the Maryland Proton Treatment Center in downtown Baltimore. It's one of three such centers under development in the Washington, D.C., region. Jenny Gold/KHN hide caption

toggle caption Jenny Gold/KHN
Proton Center Closure Doesn't Slow New Construction
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Proton beam therapy can precisely target tumors to avoid harming surrounding tissue, advocates say. Blythe Bernhard/St. Louis Post-Dispatch/MCT/Landov hide caption

toggle caption Blythe Bernhard/St. Louis Post-Dispatch/MCT/Landov