Higher Post-Operative Serum Vitamin D Level is Associated with Better Survival Outcome in Colorectal Cancer Patients.

25-Hydroxyvitamin D (25-OHD) may have a prognostic value in colorectal cancer (CRC) patients. However, as 25-OHD concentration is strongly impacted by surgery, it is uncertain what is the most reliable time-point for 25-OHD assessment, pre- or post-operative. Therefore, we examined 515 CRC patients (AJCC I-III) who underwent surgery. Blood samples were collected either pre-operatively (n = 286; median = 1 day before surgery) or post-operatively (n = 229; median = 8 days). Serum 25-OHD concentration was determined by liquid chromatography-tandem mass spectrometry. Association between 25-OHD and survival was tested in the whole cohort, followed by stratified analyses in pre- and post-operatively sampled. Median 25-OHD in the cohort was 36.7 nmol/L and median follow-up time was 5.9 years. There were no differences between pre- and post-operative cohort in age, sex, 25-OHD, AJCC stage, or localization of tumor. After adjustment, higher 25-OHD (>50 nmol/L) was associated with better overall survival only in post-operative (HR = 0.53; 95% CI: 0.33-0.84; P = 0.006), but not in pre-operative cohort (HR = 1.13; 95% CI: 0.77-1.65; P = 0.53). In conclusion, higher post-operative 25-OHD levels were associated with better survival outcome in CRC patients, while no such association was found for pre-operative levels. Time-point of blood collection should be addressed carefully in future research as it might affect the prognostic value of 25-OHD in CRC.

Proofs for implementation of higher HE4 and ROMA index cut-off values in ovarian cancer preoperative stratification.

This study aimed to identify and quantify the clinical significance of the HE4 and ROMA index in patients with an adnexal tumour. We recruited 159 women and the HE4 and CA125 were measured with an electrochemiluminescence immunoassay in the sera. We used the Kolmogorov-Smirnov test, Mann-Whitney's test and logistic regression to interpret the data. In the premenopausal group (n = 57), the ROC analysis (with cut-off: 86.1 pmol/L for HE4; 40.7 U/L for CA125 and 21.9% for ROMA) demonstrated the superior prognostic potential of those markers when the higher cut-offs used are compared to producers. The AUC for HE4/CA125/ROMA were 0.846/0.867/0.846, respectively. The HE4/ROMA showed 85.7% sensitivity and 94% specificity. In the postmenopausal group (n = 102), the ROC analysis cut-off values were: 99.8 pmol/L for HE4; 45.8 U/L for CA125 and 38.4% for ROMA. AUC for HE4/CA125/ROMA were 0.928/0.899/0.927, respectively. HE4 had an 86.1% sensitivity at 92.4% specificity, while ROMA showed an 88.9% sensitivity at a 90.9% specificity. Impact Statement What is already known on this subject? The incidence of ovarian cancer has been increasing, despite the improvement of diagnostic, operative and therapeutic procedures. As a part of the multiparametric approach, the HE4 and ROMA index improve the diagnostic sensitivity and specificity of CA125 in the detection of ovarian cancer. What the results of this study add? The evaluation of HE4 and ROMA efficacy in the preoperative stratification was made by logistic regression analysis. The better prognostic potential of ROMA index, in patients with present adnexal mass, was obtained using our higher cut-offs for the ROMA index (21.9% for premenopausal and 38.4% for postmenopausal) in comparison to the producer's (11.7% for premenopausal and 29.9% for postmenopausal). The HE4 and ROMA index had 14.29 +LR, 0.15 -LR, 67% PPV and 97.9% NPV in the premenopausal patients. In the postmenopausal group, the HE4 had 11.37 +LR, 0.15 -LR, 75.6% PPV and 92.4% NPV, the ROMA showed 9.78 +LR, 0.12 -LR, 91.2% PPV and 95.2% NPV. What the implications are of these findings for clinical practice and/or further research? Application of a higher cut-off for HE4/CA125/ROMA index can significantly reduce the percentage of FP and FN in the preoperative stratification of ovarian cancer and justify speculations about this subject in the future.

Comparison of Enzymatic Assay for HBA1C Measurement (Abbott Architect) With Capillary Electrophoresis (Sebia Minicap Flex Piercing Analyser).

OBJECTIVE: To compare the analytical performances of the enzymatic method (EM) and capillary electrophoresis (CE) for hemoglobin A1c (HbA1c) measurement. METHODS: Imprecision, carryover, stability, linearity, method comparison, and interferences were evaluated for HbA1c via EM (Abbott Laboratories, Inc) and CE (Sebia). RESULTS: Both methods have shown overall within-laboratory imprecision of less than 3% for International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) units (<2% National Glycohemoglobin Standardization Program [NGSP] units). Carryover effects were within acceptable criteria. The linearity of both methods has proven to be excellent (R2 = 0.999). Significant proportional and constant difference were found for EM, compared with CE, but were not clinically relevant (<5 mmol/mol; NGSP <0.5%). At the clinically relevant HbA1c concentration, stability observed with both methods was acceptable (bias, <3%). Triglyceride levels of 8.11 mmol per L or greater showed to interfere with EM and fetal hemoglobin (HbF) of 10.6% or greater with CE. CONCLUSION: The enzymatic method proved to be comparable to the CE method in analytical performances; however, certain interferences can influence the measurements of each method.