Does vitamin D3 protect against tumor and heart disease? [Digital]

Introductory quote:

A number of epidemiological studies suggest that there is a possible association between low serum vitamin D levels and increased risk of cardiovascular disease and malignancy. However, it cannot be concluded from this that a corresponding vitamin D substitution is actually a
has a preventive effect. Previous therapy studies had too few patients to investigate this question. The present study examined the question: Can a dietary supplement with vitamin D3 (cholecalciferol) reduce the risk of cardiovascular diseases including stroke or the occurrence of malignant tumors?