• Patients must have the ability to understand and the willingness to sign a written informed consent document.

• Participants must have confirmed or suspected metastatic renal cell carcinoma, and must be planned for either nephrectomy or metastatectomy as part of their clinical care. The lesion planned for excision must be at least 1cm in size.

• Participants must be 18 years of age or older.

• Participants must be evaluated by a medical oncologist who will determine the clinically appropriate treatment strategy based on clinical history and extent of disease.

• Patients must be deemed medically stable to undergo both percutaneous procedures and standard-of-care surgical procedures.

• Participants will undergo laboratory testing within 30 days prior to the procedure (or within 72 hours if there has been a change in the clinical status since the initial blood draw). Patients must have absolute neutrophil count ≥1,000/mcL, platelets ≥50,000/mcL, PT (INR) 1.5 and PTT \<1.5x control.

• Participants must have undergone CT or MRI that assesses the extent of disease and allows the research team to assess for study eligibility. This will have been done as part of the standard-of-care.

• The participant's case must be reviewed by representatives of interventional radiology and the appropriate surgical subspecialty to assess the following factors:

‣ Patient is clinically stable to undergo microdevice implantation and surgical procedures

⁃ Patient has sufficient volume of disease to allow implantation of the microdevice

⁃ Patient has a lesion for which the microdevice is a) amenable to percutaneous placement, and b) amenable to removal at the time of surgery

• Patients must be willing to undergo research-related genetic sequencing (somatic and germline) and data management, including the deposition of de-identified genetic sequencing data in NIH central data repositories.