Jefferies analyst Biren Amin is highlighting a "little known" head-to-head study being conducted at the National Institutes of Health to compare the efficacy of Alkermes' Vivitrol and Indivior's Suboxone. The study enrolled treatment-seeking heroin- and/or prescription opioid-dependent patients admitted into a detox unit, and following a detoxification regimen are randomized to receive Vivitrol or Suboxone treatment for six months, Amin tells investors in a research note. He believes the outcome of the study could have positive implications on Vivitrol's long-term outlook. The analyst does not expect Vivitrol to demonstrate superiority to Suboxone on the primary outcome, but thinks the trial could "illuminate some important differences" and show a trend of improvement for Vivitrol in relapse rate at six months. He points out that Alkermes continues to estimate Vivitrol is currently only capturing 1%-2% market share and sees "significant" room for upside. Data from the study could be seen by year-end 2017 or early 2018, Amin writes. He keeps a Buy rating on Alkermes with a $70 price target.