This document provides technical specifications for submitting patient-reported outcome (PRO) data collected in cancer clinical trials to support a marketing application for a medical product in oncology, where a PRO is a type of clinical outcome assessment (COA) used to collect patient experience data. The FDA Patient-Focused Drug Development (PFDD) Glossary defines a PRO as a measurement based on a report that comes directly from the patient (i.e., study subject) about the status of a patient's health condition without interpretation of the patient’s response by a clinician or anyone else, where a PRO can be measured by self-report or by interview, provided that the interviewer records only the patient’s response. This technical specifications document supplements FDA’s draft guidance for industry Core Patient-Reported Outcomes in Cancer Clinical Trials (June 2021) and the PFDD Guidance series.