The Blood Oxygenation T2*Values of Resectable Esophageal Squamous Cell Carcinomas as Measured by 3T Magnetic Resonance Imaging: Association with Tumor Stage

Objective: To explore the association between the blood oxygenation T 2 * values of resectable esophageal squamous cell carcinomas (ESCCs) and tumor stages. Materials and Methods:This study included 48 ESCC patients and 20 healthy participants who had undergone esophageal T 2 *-weighted imaging to obtain T 2 * values of the tumors and normal esophagi.ESCC patients underwent surgical resections less than one week after imaging.Statistical analyses were performed to identify the association between T 2 * values of ESCCs and tumor stages.Results: One-way ANOVA and Student-Newman-Keuls tests revealed that the T 2 * value could differentiate stage T1 ESCCs (17.7 ± 3.3 ms) from stage T2 and T3 tumors (24.6 ± 2.7 ms and 27.8 ± 5.6 ms, respectively; all ps < 0.001).Receiver operating curve (ROC) analysis showed the suitable cutoff T 2 * value of 21.3 ms for either differentiation.The former statistical tests demonstrated that the T 2 * value could not differentiate between stages T2 and T3 (24.6 ± 2.7 ms vs. 27.8 ± 5.6 ms, respectively, p > 0.05) or between N stages (N1 vs. N2 vs. N3: 24.7 ± 6.9 ms vs. 25.4 ± 4.5 ms vs. 26.8± 3.9 ms, respectively; all ps > 0.05).The former tests illustrated that the T 2 * value could differentiate anatomic stages I and II (18.8 ± 4.8 ms and 26.9 ± 5.9 ms, respectively) or stages I and III (27.3 ± 3.6 ms).ROC analysis depicted the same cutoff T 2 * value of 21.3 ms for either differentiation.In addition, the Student's t test revealed that the T 2 * value could determine grouped T stages (T0 vs. T1-3: 17.0 ± 2.9 ms vs. 25.2 ± 6.2 ms; T0-1 vs. T2-3: 17.3 ± 3.0 ms vs. 27.1 ± 5.3 ms; and T0-2 vs. T3: 18.8 ± 4.2 ms vs. 27.8 ± 5.6 ms, all ps < 0.001).ROC analysis indicated that the T 2 * value could detect ESCCs (cutoff, 20 ms), and discriminate between stages T0-1 and T2-3 (cutoff, 21.3 ms) and between T0-2 and T3 (cutoff, 20.4 ms).Conclusion: The T 2 * value can be an additional quantitative indicator for detecting ESCC except for stage T1 cancer, and can preoperatively discriminate between some T stages and between anatomic stages of this tumor.