D Vitamin in Treating Participants with Stage III Colon Cancer or Stage II / III Rectal Cancer

Status: Active


This pilot trial studies how well D vitamin works in treating participants with stage III colon cancer or stage II / III rectal cancer. D vitamin may raise serum vitamin D levels and impact survival of colon and rectal cancer patients.

Eligibility Criteria

Inclusion Criteria

  • Diagnosed with stage III colon or stage II/III rectal cancer that will receive neoadjuvant or adjuvant chemotherapy but have not yet started
  • Baseline serum vitamin D total 25-hydroxy level below 66 ng/ml
  • Willing to stop herbal medications as directed by physician
  • Willing to stop current supplemental vitamin D (multivitamin with vitamin D component is acceptable)
  • Willing to travel to a Legacy Health/Oregon Health & Science University (OHSU) facility if necessary
  • Agree to attend study visits outside of standard of care visits, if needed

Exclusion Criteria

  • Colon cancer stages I-II and IV or rectal cancer stage I or IV
  • Multi-focal disease (unless pre-approved by principal investigator [PI])
  • Patients who do not undergo chemotherapy
  • Patients with prior chemotherapy for this cancer
  • No other prior malignancy except for adequately treated basal cell or squamous cell skin cancer, in situ cancer, or other cancer for which the patient has been disease-free for > 3 years
  • Unwilling or unable to stop oral supplemental vitamin D
  • Patients taking high-dose vitamin D supplementation (50,000 IU weekly) prior to enrollment
  • Patients with vitamin D total 25-hydroxy level above 66 ng/ml at baseline testing
  • Patients with hypercalcemia and/or any condition resulting in malabsorption
  • Unable to comply with protocol
  • Unable to provide written informed consent
  • Investigator does not believe study participation, for any reason, is in the best interest of the patient

Locations & Contacts


Legacy Good Samaritan Hospital and Medical Center
Status: Active
Contact: Eric C. Anderson
Phone: 503-413-8199
Email: andeeric@ohsu.edu

Trial Objectives and Outline


I. Evaluate the efficacy of D vitamin (vitamin D) supplementation in raising vitamin D levels during chemotherapy for patients with stage III colon and stage II/III rectal cancer to a standard healthy level.


I. Evaluate the efficacy of vitamin D in improving survival outcomes for patients with Stage III colon and stage II/III rectal cancer.

OUTLINE: Participants are randomized to 1 of 2 groups.

GROUP A: Beginning same day as chemotherapy treatment, participants receive standard dose of D vitamin orally (PO) daily for 1 year.

GROUP B: Beginning same day as chemotherapy treatment, participants receive high dose of D vitamin PO weekly for 1 year.

After completion of study, participants are followed up every year for up to 5 years.

Trial Phase & Type

Trial Phase

Phase II

Trial Type


Lead Organization

Lead Organization
Legacy Good Samaritan Hospital and Medical Center

Principal Investigator
Eric C. Anderson

Trial IDs

Primary ID STUDY00015051
Secondary IDs NCI-2018-00493
Clinicaltrials.gov ID NCT02603757