Cancer News
OncoLink Cancer News - HealthDay


Vitamin and Drug Combination May Benefit Breast Cancer

-- A. Agrawal, PhD

Thursday, January 7, 2010

THURSDAY, Jan. 7 (HealthDay News) -- The active form of vitamin D selectively reduces the production of aromatase, which catalyzes the production of estrogen, in breast cancers, and, when combined with aromatase inhibitors, further reduces tumor growth, according to a study in the January issue of Endocrinology.

Aruna V. Krishnan, Ph.D., and colleagues from Stanford University School of Medicine in California investigated the effect of calcitriol, the hormonally active form of vitamin D, on the expression of aromatase in various cell types and in mice bearing human breast cancers.

The researchers found that calcitriol significantly reduced aromatase expression in human breast cancer cells and adipocytes, modestly increased expression in ovarian cancer cells, and substantially increased expression in human osteosarcoma cells. Similar results were observed in immunocompromised mice bearing human breast tumors. In breast cancer cells, calcitriol also reduced the levels of prostaglandins, which stimulate aromatase expression. Combination treatment of breast cancers with calcitriol and aromatase inhibitors led to enhanced inhibition of cell growth.

"The combination of calcitriol and an aromatase inhibitor may have potential benefits for breast cancer therapy," Krishnan and colleagues conclude. "In addition to augmenting the ability of aromatase inhibitors to inhibit breast cancer growth, calcitriol acting as a selective aromatase modulator that increases aromatase expression in bone would reduce the estrogen deprivation in bone caused by the aromatase inhibitors, thus ameliorating the aromatase inhibitor-induced side effect of osteoporosis."

Abstract
Full Text (subscription or payment may be required)

Specialties Cardiology
Diabetes & Endocrinology
Internal Medicine
Family Practice

Copyright © 2010 ScoutNews, LLC. All rights reserved.


I Wish You Knew

OncoLink/LIVESTRONG Care Plan

View More



Blogs and Web Chats

OncoLink Blogs give our readers a chance to react to and comment on key cancer news topics and provides a forum for OncoLink Experts and readers to share opinions and learn from each other.




OncoLink OncoPilot

Facing a new cancer diagnosis or changing the course of your current treatment? Let our cancer nurses help you through!

Learn More