The purpose of this guidance is to describe an optional streamlined submission process for determining whether use of an investigational in vitro diagnostic (IVD) in a clinical trial for an oncology therapeutic is considered significant risk (SR), nonsignificant risk (NSR), or exempt from investigational device exemption (IDE) requirements. If the IVD in the trial is determined to be SR in the streamlined process, the sponsor may need to submit an IDE to the appropriate center (Center for Devices and Radiological Health (CDRH) or Center for Biologics Evaluation and Research (CBER)) in addition to submitting an investigational new drug application (IND) to the appropriate center (Center for Drug Evaluation and Research (CDER) or CBER). FDA encourages sponsors to use the streamlined process described in this guidance when possible to reduce administrative burden on sponsors and FDA and to maintain the current level of regulatory review.