HonCode

Go Back   HER2 Support Group Forums > Breast Cancer News
Register Gallery FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
Old 04-15-2013, 10:16 AM   #1
1rarebird
Senior Member
 
Join Date: Feb 2010
Location: TN
Posts: 175
Vitamin D levels linked to Tamoxifen response

Breast Cancer Res Treat. 2013 Apr 12. [Epub ahead of print]
CYP3A4 and seasonal variation in vitamin D status in addition to CYP2D6 contribute to therapeutic endoxifen level during tamoxifen therapy.

Teft WA, Gong IY, Dingle B, Potvin K, Younus J, Vandenberg TA, Brackstone M, Perera FE, Choi YH, Zou G, Legan RM, Tirona RG, Kim RB.
Source

Division of Clinical Pharmacology, Department of Medicine, University of Western Ontario, London, ON, Canada.

Abstract

Tamoxifen is a widely utilized adjuvant anti-estrogen agent for hormone receptor-positive breast cancer, known to undergo CYP2D6-mediated bioactivation to endoxifen. However, little is known regarding additional genetic and non-genetic determinants of optimal endoxifen plasma concentration. Therefore, 196 breast cancer patients on tamoxifen were enrolled in this prospective study over a 24-month period. Blood samples were collected for pharmacogenetic and drug-level analysis of tamoxifen and metabolites. Regression analysis indicated that besides CYP2D6, the recently described CYP3A4*22 genotype, seasonal variation, and concomitant use of CYP2D6-inhibiting antidepressants were significant predictors of endoxifen concentration. Of note, genetic variation explained 33 % of the variability while non-genetic variables accounted for 13 %. Given the proposed notion of a sub-therapeutic endoxifen concentration for predicting breast cancer recurrence, we set the therapeutic threshold at 18 nM, the 20th percentile for endoxifen level among enrolled patients in this cohort. Nearly 70 % of CYP2D6 poor metabolizers as well as extensive metabolizers on potent CYP2D6-inhibiting antidepressants exhibited endoxifen levels below 18 nM, while carriers of CYP3A4*22 were twofold less likely to be in sub-therapeutic range. Unexpectedly, endoxifen levels were 20 % lower during winter months than mean levels across seasons, which was also associated with lower vitamin D levels. CYP3A4*22 genotype along with sunshine exposure and vitamin D status may be unappreciated contributors of tamoxifen efficacy. The identified covariates along with demographic variables were integrated to create an endoxifen concentration prediction algorithm to pre-emptively evaluate the likelihood of individual patients falling below the optimal endoxifen concentration.


PMID:23580071 [PubMed - as supplied by publisher]
__________________
Male Breast Cancer, DX 5/15/09, IDC, STAGE 1, 1.7 cm, HER2+++, ER+(95%)/PR+(75%), Ki67 40%, grade 3, 0/5 nodes, TX: mastectomy, TCH finished 7/19/10, radiation 6 wks., Tamoxifen on going, bisphosphonate 24 mos.
1rarebird is offline   Reply With Quote
Old 04-15-2013, 12:38 PM   #2
Laurel
Senior Member
 
Laurel's Avatar
 
Join Date: May 2008
Location: Hershey, PA. Live The Sweet Life!
Posts: 2,005
Re: Vitamin D levels linked to Tamoxifen response

Interesting, Bird. Thanks!
__________________

Smile On!
Laurel


Dx'd w/multifocal DCIS/IDS 3/08
7mm invasive component
Partial mast. 5/08
Stage 1b, ER 80%, PR 90%, HER-2 6.9 on FISH
0/5 nodes
4 AC, 4 TH finished 9/08
Herceptin every 3 weeks. Finished 7/09
Tamoxifen 10/08. Switched to Femara 8/09
Bilat SPM w/reconstruction 10/08
Clinical Trial w/Clondronate 12/08
Stopped Clondronate--too hard on my gizzard!
Switched back to Tamoxifen due to tendon pain from Femara

15 Years NED
I think I just might hang around awhile....

Laurel is offline   Reply With Quote
Old 12-30-2015, 03:02 AM   #3
Loorry
Junior Member
 
Join Date: Nov 2015
Posts: 1
Re: Vitamin D levels linked to Tamoxifen response

The metabolites analysis at drug test level should be very reliable. Very impressive.
Loorry is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 08:08 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright HER2 Support Group 2007 - 2021
free webpage hit counter