89Zr-DFO-Atezolizumab ImmunoPET/CT in Patients With Locally Advanced or Metastatic Renal Cell Carcinoma

Inclusion Criteria:

* Patients with suspected renal cell carcinoma with planned surgery or patients with metastatic RCC and a tissue diagnosis. (In standard clinical practice, biopsy is not routinely performed in patients who will be having surgery).
* Ability to understand and the willingness to sign a written informed consent.
* Patient must be able to lie still for a 30 to 60 minute PET/CT scan.
* One of the following:

  1. Patients with locally advanced RCC planned for surgery determined to be a high risk of recurrence, defined by presence of at least clinical T2 or TxN1, OR patients with metastatic RCC for whom treatment with cytoreductive nephrectomy and/or metastasectomy is planned by the treating physician.
  2. Patients with metastatic RCC for whom immuno-oncology (IO) therapy is planned.
* Women of child-bearing potential must agree to undergo and have documented a negative pregnancy test on the day of 89Zr-DFO-Atezolizumab administration. A female of child-bearing potential is any woman (regardless of sexual orientation, having undergone a tubal ligation, or remaining celibate by choice) who meets the following criteria:

  * Has not undergone a hysterectomy or bilateral oophorectomy; or
  * Has not been naturally postmenopausal for at least 12 consecutive months (i.e., has had menses at any time in the preceding 12 consecutive months).

Exclusion Criteria:

* History of severe allergic, anaphylactic, or other hypersensitivity reactions to atezolizumab or any other chimeric or humanized antibodies.
* Uncontrolled severe and irreversible intercurrent illness or psychiatric illness/social situations that would limit compliance with study requirements.
* Subjects must not be pregnant or nursing due to the potential for congenital abnormalities and the potential of this regimen to harm nursing infants.
* Significant autoimmune disease requiring treatment with either prednisone (or steroid equivalent) at a dose \> 10 mg/day or other immunosuppressive agents. (Replacement steroid therapy is acceptable).
* Any patient for whom ICI therapy would be contraindicated for other reasons. Patients with adverse reactions to ICI therapy may undergo second 89Zr-DFO-Atezolizumab injection and PET/CT at the discretion of the treating physician considering that the dose of antibody represents 1% of a single therapeutic dose and therefore unlikely to cause adverse events.
* Subjects unable to provide informed consent.
* Subjects who are claustrophobic or have other contraindications to PET/CT.
* Subjects must not weigh more than the maximum weight limit for the table for the PET/CT scanner where the study is being performed. (\>200 kg or 440 lbs).