Spanish to English Medical Medical: Pharmaceuticals immunosuppressive and chemotherapy drugs

Translationg a worksheet by a physician with notes on mainly immunosuppressive and chemotherapy drugs. Unfortunately, not much context and no contact with source. Three phrases contain the abbreviation or acronym (in lower case letters): La rpta es sostenida a las 104 semanas con similar seguridad a la rama standard of care; No se muestran los porcentajes de rpta ni los datos de seguridad; buena rpta a las 52 semanas con un endpoint comparable a otros focos en discusión. In this document the source text often uses English terms/acronyms, so not sure if it's English or Spanish. Have researched for an hour now, and can't find it anywhere in any dictionaries or texts. Hopefully someone will have some insight for me! Thanks.