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Clinicopathological characteristics and prognosis of metastatic collecting duct carcinoma. | LitMetric
Objective : To investigate the clinicopathological characteristics, response to different treatment regimens, and prognostic factors of metastatic collecting duct carcinoma (CDC).Patients And Methods : Information of patients with metastatic CDC was retrieved from a database including clinical and survival data. Survival outcomes were analyzed with the Kaplan-Meier method, and prognostic factors were identified with the Cox proportional hazard model.Results : Fifty patients with metastatic CDC were included in this study. Most patients had an advanced T stage (58% T3-4) and high WHO/ISUP grade (86% G3-4). Twenty-nine patients (58%) developed metastases from an early stage, 42% had distant metastases at diagnosis, and 28% received cytoreductive nephrectomy. In the first-line setting, the objective response rate was 27.0%, and the median progression-free survival was 6.4 months (95%CI 4.9-7.9) for 37 patients who received chemotherapy combined with sorafenib. One PR was seen in 4 patients who received anti-PD-1 antibody plus axitinib. The median overall survival for the whole population was 12.6 months (95%CI 7.8-17.4). In univariate analyses, advanced T stage, East Cooperative Oncology Group Performance Score ≥1, anemia, elevated lactate dehydrogenase, and no response to first-line treatment was associated with poor prognosis (P < 0.05). In multivariate analyses, advanced T stage and anemia were independently associated with a poorer prognosis. The Memorial Sloan-Kettering Cancer Center (MSKCC) model (P = 0.002) predicted the prognosis of metastatic CDC patients more accurately than the International Metastatic Renal-Cell Carcinoma Database Consortium (IMDC) model (P = 0.063).Conclusion : T Stage and anemia were independent prognostic factors for metastatic CDC. MSKCC was more accurate than the IMDC model to predict the outcome. Chemotherapy plus sorafenib demonstrated substantial efficacy in the first-line setting. Anti-PD-1 plus axitinib showed a preliminary antitumor effect and is worthy of further exploration.
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