August 3, 2026 · JAMA · DOI: 10.1001/jama.2026.9350

Addition of High-Dose Vitamin D3 to Standard Treatment in Patients With Metastatic Colorectal Cancer: The SOLARIS Randomized Clinical Trial (Alliance A021703)

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The SOLARIS trial aimed to determine whether high-dose vitamin D3, when added to standard chemotherapy, improves outcomes in patients with previously untreated metastatic colorectal cancer (mCRC). The study found that high-dose vitamin D3 did not significantly enhance progression-free survival compared to standard-dose vitamin D3, nor did it show improvements in overall survival or response rates. Overall, the addition of high-dose vitamin D3 did not provide clinically meaningful benefits in this patient population.

Kimmie Ng, Fang-Shu Ou, Tyler Zemla, Nadine A Jackson, Aparna Kalyan, Craig Devoe, Michael Shusterman, Namrata Vijayvergia, Christina S Wu, Stacey A Cohen, Sydney Pulsipher, Ardaman Shergill, Yasmeem Watson, Barbara Kleiber, Myounghee Lee, Christine G Kohn, Jennifer S Thalappillil, Lawrence H Schwartz, Dan Zuckerman, Bruce W Hollis, Eileen M O'Reilly, Jeffrey A Meyerhardt

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