Introduction to the special issue on innovative interventions and approaches to expand medication assisted treatment: Seizing research opportunities made available by the opioid STR program.

The 21st Century Cures Act is the most significant piece of U.S. legislation aimed at tackling the opioid epidemic to date. This special issue comprises papers reflecting medication-assisted treatment (MAT)-related research made possible through the Cures Act-authorized State Targeted Response (STR) grant mechanism. Work related to both STR evaluation and original research conducted within the context of STR activities are included in the issue, with topics including community assessments of MAT-related needs, MAT access and linkage, criminal justice-oriented MAT implementation, and adjunctive MAT supports and treatments. All of the research represented this issue is early-stage, with results reflecting data collected primarily within the first of STR's two year funding cycle. While such formative work does have inherent limitations, the gravity of the opioid epidemic requires rapid assessment and dissemination of results to inform the public health response in a manner that will have a timely and meaningful impact.