Vitamin D Supplementation Regulates Postoperative Serum Levels of PD-L1 in Patients with Digestive Tract Cancer and Improves Survivals in the Highest Quintile of PD-L1: A Post Hoc Analysis of the AMATERASU Randomized Controlled Trial.

What Was Tested

The paper reports a study of Vitamin D, K2, Magnesium and Zinc, published as a randomized controlled trial.

Because vitamin D responsive elements have been found to be located in the PD-L1 gene, vitamin D supplementation was hypothesized to regulate serum PD-L1 levels and thus alter survival time of cancer patients.

Who Took Part

According to the abstract, 417 patients were involved.

The age groups tagged for this paper are middle-aged adults and older adults, both men and women.

How the Study Was Run

In design terms this was a randomized, double-blind and placebo-controlled study.

Because people in this Vitamin D, K2, Magnesium and Zinc study were split into groups at random, differences between the groups are less likely to reflect who happened to join each one.

Neither the patients nor the staff measuring them knew who was on Vitamin D, K2, Magnesium and Zinc, so expectations could not easily colour the readings.

Some patients received a placebo instead of Vitamin D, K2, Magnesium and Zinc, giving a reference point.

Postoperative serum PD-L1 levels were measured by ELISA and divided into quintiles (Q1-Q5).

What Was Measured

Because vitamin D responsive elements have been found to be located in the PD-L1 gene, vitamin D supplementation was hypothesized to regulate serum PD-L1 levels and thus alter survival time of cancer patients.

Topics PubMed links to this paper include B7-H1 Antigen, Cholecalciferol, Dietary Supplements, Digestive System Neoplasms, Neoplasm Recurrence, Local, Nutrition Therapy and Postoperative Period.

The authors tagged it with the keywords PD-L1, cancer, placebo, randomized, serum and soluble.

What This Means in Plain Language

The paper is a randomized, double-blind and placebo-controlled study of Vitamin D, K2, Magnesium and Zinc in 417 patients.

With several hundred people or more, it is a fairly large study for this kind of research.

The publication is from 2021 (Nutrients), a journal based in Switzerland.

More context: the Vitamin D, K2, Magnesium and Zinc compound page, all human trials.