(CNN) President Barack Obama signed a $6.3 billion bill Tuesday to boost spending for medical research on cancer and other diseases as well as address the country's mental health crisis and opioid epidemic. The 21st Century Cures Act, which has a part of its legislation named in honor of Vice President Joe Biden's son Beau Biden, who died last year of brain cancer, came in the waning days of the Congress. "The Cures Act invests in a breakthrough effort that we've been calling the 'vice president's cancer moonshot.' And I think the Senate came up with a better name when they named it after Beau Biden," Obama said in remarks at the White House.