ABSTRACT
Objective:To investigate the value of quantitative parameters derived from dual-layer spectral detector CT (SDCT) in characterizing regional lymph node (LN) status of colorectal cancer.Methods:From August 2019 to May 2020, 101 patients with colorectal cancer confirmed by pathology in the First Affiliated Hospital of Sun Yat-sen University were retrospectively collected. The largest regional LNs were matched with surgical pathology one by one and divided into metastatic LNs group (42 cases) and nonmetastatic LNs group (59 cases) according to pathological results. Based on preoperative venous phase contrast enhanced SDCT images he short-axis diameter (S) and the of the largest regional LN was measured, then its border and enhancement homogeneity were evaluated. Outlining the ROI along the edge of the LN on its widest cross section, the iodine density (ID) and effective atomic number (Z eff) were measured, then the normalized ID (nID) and normalized Z eff (nZ eff) were calculated. The χ 2 test, Fisher′s exact test, independent samples t-test or Mann-Whitney U test were used to compare the differences of each parameter between pathologically metastatic and nonmetastatic LNs and a logistic regression model was constructed. The ROC curves and area under the curve (AUC) were performed to evaluate the diagnostic performance of each parameter. DeLong test was used to compare the differences of each AUC. Results:The S, border, enhancement homogeneity, ID, Z eff, nID and nZ eff of LNs all showed significant differences between metastatic and nonmetastatic LNs (all P<0.001). The regression model constructed by S and Z eff of LNs had the highest value in differentiating metastatic and nonmetastatic LNs, with an AUC of 0.935, sensitivity and specificity of 85.7% and 89.8%, respectively. Its diagnostic value was higher than that of S, border, enhancement homogeneity (AUC 0.674-0.832, all P<0.05) and SDCT quantitative parameters (AUC 0.863-0.906, all P<0.05) of LNs. Conclusion:SDCT quantitative parameters facilitate the accurate diagnosis of regional metastatic LNs in patients with colorectal cancer, among which the multi-parameter regression model has the highest diagnostic value.
ABSTRACT
Objective To explore the repeatability and consistency of MR intravoxel incoherent motion (IVIM) parameters of rectal cancers.Methods Routine high resolution rectal MR and IVIM sequence were performed on 128 patients with pathologically proved rectal cancers before treatment.IVIM maps were generated from two sets of b-values (group A:0,5,10,20,30,40,60,80,100,150,200,400,600 and 1000 s/mm2;group B:0,5,10,20,30,40,60,80,100,150,200,400,600,1000,1500 and 2000 s/mm2),and IVIM parameters (D,D* and f) were measured.Then IVIM parameters were measured again by the same observer three months later.The intra-class correlation coefficient (ICC) and Bland-Altman graph analysis were performed to explore the repeatability and consistency of IVIM parameters.Results The differences of IVIM parameters (D,D* and f) derived from the two sets of b-values were statistically different (all P＜0.001).ICC and 95％ confidence interval (CI) of D,D* and f was 0.968 (0.955,0.977),0.780 (0.688,0.845) and 0.957 (0.934,0.970),respectively.Bland-Altman analysis showed that the 95 ％ limits of agreement of D,D* and f was (10.8％,22.4％),(14.8％,61.9％) and (-45.3％,-10.2％),respectively.There was significant difference of D* between twice measurement by the same observer (P=0.001);ICC and 95％CI of D,D* and f was 0.826(0.670,0.908),0.678 (0.392,0.830) and 0.910 (0.830,0.952),respectively.Furthermore,Bland-Altman analysis showed that the 95％ limits of agreement of D,D* and f were (-15.3％,12.4％),(-39.6％,61.2％) and (-22.6％,22.9％),respectively.Conclusion Under the two different sets of b-values,all IVIM parameters of rectal cancers demonstrate good consistency.In addition,D and f value show good repeatability.
ABSTRACT
Transient receptor potential (TRP) channels affect several inflammatory and neoplastic conditions.and are widely distributed and activated by multiple stimuli.Mean while,as the sensor to the changes in cellular local environments,TRP channels have multiple functions,including thermal,mechanical and taste sensing,as well as ion homeostasis maintaining.They can regulate muscle contractions,transmitter release,cell multiplication,cell differentiation,genetic transcription,apoptosis and molecular death.TRPM8,a nonselective cation channel,was originally cloned as a prostate-specific protein.Now,TRPM8 is found in carcinoma of colon,lung cancer,mammary cancer,pancreatic cancer and cutaneum carcinoma.The aim of this review is to summarize data reported so far on the expression and functional role of TRPM8 channels in different types of cancers.