Circulating Vitamin D and Selenium Levels and Outcome in Prostate Cancer Patients: Lessons from the MARTINI-Lifestyle Cohort.

BACKGROUND: Dietary agents, in particular vitamin D (Vit D) and selenium, are widely used by prostate cancer (PCa) patients to improve cancer outcomes. OBJECTIVE: To investigate whether plasma Vit D and selenium levels prior to radical prostatectomy (RP) are associated with worse pathologic tumor characteristics and increased risk of disease recurrence. DESIGN, SETTING, AND PARTICIPANTS: A total of 3849 men with PCa scheduled for RP in the Martini-Klinik at the University Hospital Hamburg-Eppendorf, Hamburg, Germany, between January 2014 and December 2018 were included in this study. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: Age, and clinical and laboratory values were collected prior to RP. Biochemical recurrence (BCR) was defined as prostate-specific antigen (PSA) ≥0.2 µg/l and rising after RP. Kaplan-Meier plots depicted BCR-free survival. Cox regression models (adjusted for age, preoperative PSA, pT stage, pN stage, pGG, surgical margin status, and year of surgery) tested the relationship between oncologic outcomes and Vit D and selenium levels. RESULTS AND LIMITATIONS: Median plasma Vit D and selenium levels were 19.3 and 71 µg/l, respectively. Circulating Vit D and selenium levels correlated inversely with PSA values. Histologic grade, pT stage, and pN stage were not associated with Vit D and selenium levels at the time of RP. In the overall cohort, BCR-free survival at 3 yr of follow-up was 82.9%. When stratified according to median Vit D levels, BCR-free survival at 3 yr of follow-up was 82.7% and 83.0% (p ≤ 0.59). Upon stratification according to median selenium levels, BCR-free survival was 82.2% and 83.7% (p = 0.19). In a multivariable Cox regression model predicting BCR, lower Vit D and selenium levels were not independent predictors of BCR. CONCLUSIONS: Plasma Vit D and selenium levels prior to RP were not associated with BCR-free survival. PATIENT SUMMARY: The results of the MARTINI-Lifestyle cohort could not show a correlation between the occurrence of biochemical recurrence of prostate cancer after radical prostatectomy and the serum levels of vitamin D and selenium. A recommendation should therefore be made to compensate for a potential deficiency and not with the expectation of a reduction in the risk of progression.

Poor Adherence to International Cancer Prevention Recommendations Among Patients With Prostate Cancer: First Results From the MARTINI-Lifestyle Cohort.

BACKGROUND: Promotion of a healthy lifestyle in patients with prostate cancer (PCa) has gained traction to increase patient investment in his/her health care practices, improve patient quality of life, and improve survival outcomes. OBJECTIVE: To investigate adherence of patients with PCa to healthy lifestyle recommendations from the World Cancer Research Fund (WCRF) and the American Institute for Cancer Research (AICR). DESIGN, SETTING, AND PARTICIPANTS: A total of 2227 men with PCa scheduled for radical prostatectomy in the Martini-Klinik at the University Hospital Hamburg-Eppendorf, Hamburg, Germany between January 2016 and December 2017. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: Age and clinical characteristics were collected at the time of the diagnosis. Assessment of diet and physical activity data were obtained via e-mail surveys using validated questionnaires developed for the European Prospective Investigation into Cancer and Nutrition (EPIC) study [food frequency questionnaire, version 2 (FFQ2), EPIC-Physical Activity Questionnaire (EPIC-PAQ)]. Baseline characteristics were calculated as means and standard deviations for continuous data or counts and percentages for categorical data. RESULTS AND LIMITATIONS: Patients followed 3.3 (±1.5) of the 10 WCRF/AICR recommendations. None of the participants reached all goals; 67.3% of the patients did not fulfill the criteria of a healthy normal weight, 33.5% reported no exercise at all, and 49.6% were characterized as current or ex-smokers. As to nutritional goals, 75.4% did not meet the recommended intake of meat, 88.8% reported a low consumption of fruit and vegetables, and 86% did not achieve the recommended fiber intake. Because these analyses are based on self-reported data of diet and lifestyle, a bias toward underreporting cannot be excluded. CONCLUSIONS: First results of the MARTINI-Lifestyle cohort show that adherence to the AICR/WCRF recommendations for cancer prevention is poor. PATIENT SUMMARY: Patients with prostate cancer scheduled for surgery do not adhere to cancer prevention guidelines. Thus, improving lifestyle habits may provide significant impact on patient health and quality of life.