438 In vivo Engineered CAR-T cells for oncology using a surface-engineered lentivirus platform: nonclinical safety and biodistribution by Andrew Scharenberg, Ryan Larson, Alyssa Sheih, Mason Muhonen, Jessica Freeman, Sarah Gould, Rich Getto, Alessandra M Sullivan, Susana Hernandez, Kathryn Michels, Byoung Ryu, Alissa Brandes, Soo Min Koo, Don Parilla, Christopher Nicolai, Anna Ting, Tim Gervascio, Nanda Coelho, Anai Perez, Jeff Teoh