Clinical Performance Evaluation of the C2i Test

Inclusion Criteria: * Participants must have clinically and pathologically confirmed diagnosis of MIBC. Participants with MIBC, path T2-T4a N0/1 at cystectomy with imaging studies confirming no distant disease using cross-sectional imaging of abdomen and pelvis and chest imaging (chest X-ray or computed tomography). * Variant urothelial histology (e.g., micropapillary, plasmacytoid, sarcomatoid, nested variant, lymphoepithelioid, nested variant) is acceptable. Mixed histology (adenocarcinoma, squamous cell) is acceptable if there is a predominant (\>50%) urothelial component. * Histopathologically confirmed urothelial carcinoma as diagnosed by cystectomy. * A representative FFPE biopsy specimen (from the -cystectomy specimen) with at least 1 H\&E slide and 9 unstained slides, with an associated pathology report must be available. * Subjects must agree to 8mL blood collection during all visits. * Treatment plans must include RC. Participant is willing and able to comply with the protocol, including RC, pelvic lymph node dissection (PLND), and prostatectomy (if applicable). * The patient must be deemed appropriate for RC, PLND, and prostatectomy (if applicable) by his/her oncologist and/or urologist. * Patient's treatment plan may or may not include neoadjuvant treatment, and/or adjuvant treatment. * Eastern Cooperative Oncology Group (ECOG) Performance Status 0-2. * English or Spanish speakers * Age of Subjects: subjects must be at least 22 years of age and older, or age of majority in their local jurisdiction. There is no upper age limit. * Ability to understand and the willingness to provide an informed consent Exclusion Criteria: * Extravesical urothelial carcinoma (UC) that invades the pelvic and/or abdominal wall for bladder cancer (T4b) as evidenced by imaging. * Evidence of UC in the urinary tract (ureters, renal pelvis, and urethra) as evidenced by work-up in accordance with NCCN guidelines (e.g., abdominal/pelvic imaging) that includes imaging of upper urinary tract collecting system). * Patients with mixed histology and \<50% urothelial component as evidenced by TURBT pathology. * Tumors that contain any neuroendocrine/small cell component as evidenced by TURBT pathology. * Diagnosis of 3 or more synchronous cancers. * Malignancies other than urothelial cancer within 5 years prior to study entry except those with negligible risk of metastases or death and treated with the expectation of curative outcome (such as: carcinoma in situ of the cervix, basal or squamous cell skin cancer, ductal carcinoma in situ treated surgically with curative intent, papillary thyroid carcinoma, localized prostate cancer treated with curative intent and absence of prostate-specific antigen (PSA) relapse, or incidental prostate cancer \[Gleason score ≤ 3 + 4 and PSA \< 10 ng/mL\] undergoing active surveillance and treatment naïve). * Per physician discretion: patients with severe or uncontrolled concomitant medical, surgical, or psychiatric disease that could affect compliance with the protocol, the results of the study, or interpretation of the results. * Individuals who cannot provide consent for their own participation will not be included.