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High Ratio of Early Postoperative Calcitonin to Preoperative Calcitonin Could be a Novel Indicator of Poor Prognosis in Patients with Biochemical Incomplete Responses in Sporadic Medullary Thyroid Cancer
Institution:1. Department of Head and Neck Surgery, Fudan University Shanghai Cancer Center, Shanghai, China;2. Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China;3. Department of Head and Neck Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.;1. From the Thyroid Center, Shanghai Tenth People''s Hospital, Tongji University School of Medicine, Shanghai Center for Thyroid Diseases, Shanghai, People''s Republic of China;2. Department of Nuclear Medicine, Shanghai Tenth People''s Hospital, Tongji University School of Medicine, Shanghai, People''s Republic of China;3. Department of Medical Management, Shanghai Tenth People''s Hospital, Tongji University School of Medicine, Shanghai, People''s Republic of China;4. Department of Breast Surgery, XuZhou Central Hospital, The Affiliated XuZhou Hospital of Medical College of Southeast University, Xuzhou, People''s Republic of China.;1. Department of Medicine, University of Chicago, Chicago, IL, USA;2. Department of Pathology, University of Chicago, Chicago, IL, USA;3. Department of Health Studies, University of Chicago, Chicago, IL, USA;4. Head and Neck Medical Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy;5. Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy;6. Department of Pathology and Laboratory Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy;7. Department of Biomedical and Clinical Sciences “Luigi Sacco”, Università degli Studi, Milan, Italy
Abstract:Objective: In a cohort of medullary thyroid cancer (MTC) patients with biochemical incomplete responses, 37 to 48% developed structural persistent disease; however, few indictors were available to distinguish those patients who were more likely to develop structural disease. We hypothesized that the relationship between preoperative calcitonin (Ctn) and postoperative Ctn (within 3 days after surgery) could be used to predict early prognosis of these patients.Methods: A total of 92 sporadic MTC patients were enrolled in this study. Our team proposed a novel indicator of structural persistent MTC called the calcitonin ratio (CR; CR = postoperative Ctn/preoperative Ctn). Cox regression models and the Kaplan-Meier method were used to evaluate the prognostic capability of CR. The area under the time-dependent receiver-operating characteristic curves (AUC) and the Harrell concordance index (C-index) were used for analysis.Results: The cutoff CR value used to determine MTC prognosis was 0.15. Multivariate Cox analysis revealed that CR (hazard ratio &lsqb;HR]: 22.974, 95% confidence interval &lsqb;CI]: 3.259 to 161.959, P = .002), tumor-node-metastasis (HR: 3.968, 95% CI: 1.360 to 21.857; P = .031), and multifocality (HR: 8.466, 95% CI: 1.286 to 55.716; P = .026) independently correlated with MTC prognosis. Kaplan-Meier survival curves demonstrated a lower proportion with structural persistent disease in patients with CR <0.15 (P<.001). The 3, 5, and 10-year AUC values were 0.798, 0.752, and 0.743, respectively. The C-index of CR was 0.788 (95% CI: 0.763 to 0.813).Conclusion: In this study, CR was identified as a sensitive and specific risk stratification marker for patients with biochemical incomplete responses in sporadic MTC.Abbreviations: ATA = American Thyroid Association; AUC = area under curve; CEA = carcinoembryonic antigen; CR = calcitonin ratio; Ctn = calcitonin; HR = hazard ratio; MTC = medullary thyroid cancer; ROC = receiver operating characteristic; TNM = tumor-node-metastasis
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