Galleri® in the Medicare Population.

Inclusion Criteria: For Galleri + UC (Galleri-Tested Arm): Participants are eligible to be included in the study only if all of the following criteria apply: * Aged ≥50 years with Medicare coverage, including Traditional Medicare (Part A \& B or Dual Eligibles) or Medicare Advantage. * Capable of giving informed consent that is legally effective (consent provided by a legally authorized representative is not permitted in this protocol). For UC (Not Galleri-tested Arm): Participants are eligible to be included in the study only if all of the following criteria apply: * Aged ≥ 50 years with Medicare coverage, including Traditional Medicare (Part A \& B or Dual Eligibles) or Medicare Advantage. * Have had ≥ 1 UC visit Exclusion Criteria: For Galleri + UC (Galleri-Tested Arm): * Evidence of having had a previous MCED test (including but not limited to the Galleri test, e.g. CancerSeek, PanSeer). Participation in a study such as GRAIL's STRIVE study where results were not returned is not an exclusion criterion. * Undergoing clinical evaluation for suspicion of cancer within 6 months prior to enrollment. Personal history of hematologic malignancy and/or invasive solid tumor (excluding non-metastatic basal cell carcinoma and squamous cell carcinoma of the skin): 1. Diagnosed ≤3 years before expected enrollment date and/or 2. Diagnosed \>3 years before expected enrollment date and never treated and/or 3. Currently undergoing active cancer management (not including adjuvant hormone therapy for breast or prostate cancer). * Current pregnancy. * Individuals who are currently inpatients at a participating site. * Individuals who are not willing or able to comply with the protocol procedures. * Individuals who are not currently registered patients at a participating center. * Previous or current employees or contractors of GRAIL. For UC (Not Galleri-tested Arm): * Evidence of having had a previous MCED test (including but not limited to the Galleri test, eg.CancerSeek, PanSeer). Participation in a study such as GRAIL's STRIVE study where results were not returned is not an exclusion criterion. * Undergoing clinical evaluation for suspicion of cancer. * Personal history of hematologic malignancy and/or invasive solid tumor (not including non-metastatic basal cell carcinoma and squamous cell carcinoma of the skin): 1. Diagnosed ≤3 years before expected enrollment date and/or 2. Diagnosed \>3 years before expected enrollment date and never treated and/or 3. Currently undergoing active cancer management (not including adjuvant hormone therapy for breast or prostate cancer). * Current pregnancy. * Individuals who are currently inpatients at a participating site.