Telemedication for Opioid Use Disorder: A New Approach for Treatment.

Objective: This study aimed to determine the effect that the transition to incorporating remote care had on patients in medication for opioid use disorder (MOUD) treatment and to identify benefits and gaps in services due to this transition. Materials and Methods: Treatment data on patients receiving buprenorphine through the MOUD program were collected using electronic medical records. A 28-month window was created and encompassed three time periods: in-person MOUD prepandemic, fully remote/telehealth for MOUD (tele-MOUD), and hybrid services (combination of tele-MOUD and in-person care). Results: Rates of reported illicit drug use were consistent across all three time periods, with no statistically significant differences. Attendance at MOUD appointments and urine drug screen completion trended downward during fully remote care but approached prepandemic levels during hybrid services. Discussion: Tele-MOUD presents opportunities for improving treatment of patients with opioid use disorder, and hybrid models should continue to be adopted, evaluated, and reimbursed by insurances.

MALDI-MSI of Immunotherapy: Mapping the EGFR-Targeting Antibody Cetuximab in 3D Colon-Cancer Cell Cultures.

Immunotherapies are treatments that use a patient's immune system to combat disease. One important type of immunotherapy employed in cancer treatments is the delivery of monoclonal antibodies to block growth receptors. In this manuscript, we develop a methodology that enables accurate and simple evaluation of antibody-type drug delivery using MALDI-MSI. To overcome the mass-range limitation that prevents the detection of large therapeutic antibodies, we used in situ reduction and alkylation to break disulfide bonds to generate smaller fragments. These smaller fragments are more readily ionized and detected by MALDI-MSI without loss of spatial information on the parent drug. As a proof of concept study, we evaluated the distribution of cetuximab in 3D colon cell cultures. Cetuximab is a monoclonal antibody that binds to the extracellular domain of epidermal-growth-factor receptor (EGFR), which is often overexpressed in colorectal cancer (CRC) and mediates cell differentiation, proliferation, migration, and angiogenesis. Cetuximab directly inhibits tumor growth and metastasis and induces apoptosis. By performing on-tissue reduction followed by MALDI-MSI analysis, we successfully mapped the time-dependent penetration and distribution of cetuximab in spheroids derived from two different colon-cancer cell lines (HT-29 and DLD-1). The localization patterns were further confirmed with IF staining of the drug. Changes in other biomolecules following drug treatment were also observed, including the elevation of ATP in spheroids. The developed method has also been applied to map cetuximab distribution in patient-derived colorectal-tumor organoids (CTOs). Overall, we believe this powerful label-free approach will be useful for visualizing the heterogeneous distribution of antibody drugs in tissues and tumors and will help to monitor and optimize their use in the clinic.