A deficiency in vitamin D will lead to poor absorption of calcium for which it acts as a cofactor, this will have an overall implication on development of strong bones.
Most research has provided evidence that low vitamin D levels are associated with higher than normal risks of various types of cancer such as breast and colon cancer.
Perhaps, inadequate vitamin D levels may predispose patients to develop bone metastases if they already have cancers.
In patients having multiple myeloma and other malignancies, low vitamin D level are more common and are indicative of poor prognosis.
It may be possible to change for the better outcomes and none-cancer progression risks through supplementing on vitamin D.