Oral bisphosphonate use and breast cancer incidence in postmenopausal women.
OBJECTIVE
Emerging clinical evidence suggests intravenous bisphosphonates may inhibit breast cancer while oral bisphosphonates have received limited evaluation regarding breast cancer influence.


METHODS
The association between oral bisphosphonate use and invasive breast cancer was examined in postmenopausal women enrolled onto the Women's Health Initiative (WHI). We compared a published hip fracture prediction model, which did not incorporate bone mineral density (BMD), with total hip BMD in 10,418 WHI participants who had both determinations. To adjust for potential BMD difference based on bisphosphonate use, the hip fracture prediction score was included in multivariant analyses as a BMD surrogate.


RESULTS
Of the 154,768 participants, 2,816 were oral bisphosphonate users at entry (90% alendronate, 10% etidronate). As calculated hip fracture risk score was significantly associated with both BMD (regression line = 0.79 to 0.0478 log predicted fracture; P < .001; r = 0.43) and breast cancer incidence (P = .03), this variable was incorporated into regression analyses to adjust for BMD difference between users and nonusers of bisphopshonate. After 7.8 mean years of follow-up (standard deviation, 1.7), invasive breast cancer incidence was lower in bisphosphonate users (hazard ratio [HR], 0.68; 95% CI, 0.52 to 0.88; P < .01) as was incidence of estrogen receptor (ER) -positive invasive cancers (HR, 0.70; 95% CI, 0.52 to 0.94, P = .02). A similar but not significant trend was seen for ER-negative invasive cancers. The incidence of ductal carcinoma in situ was higher in bisphosphonate users (HR, 1.58; 95% CI, 1.08 to 2.31; P = .02).


CONCLUSIONS
Oral bisphosphonate use was associated with significantly lower invasive breast cancer incidence, suggesting bisphosphonates may have inhibiting effects on breast cancer.
Chlebowski
Rowan T
RT
Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA 90502, USA. rchlebowski@gmail.com
Chen
Zhao
Z
Cauley
Jane A
JA
Anderson
Garnet
G
Rodabough
Rebecca J
RJ
McTiernan
Anne
A
Lane
Dorothy S
DS
Manson
Joann E
JE
Snetselaar
Linda
L
Yasmeen
Shagufta
S
O'Sullivan
Mary Jo
MJ
Safford
Monika
M
Hendrix
Susan L
SL
Wallace
Robert B
RB
D000284:Administration, Oral; D000368:Aged; D019386:Alendronate / Q000627:therapeutic use; D050071:Bone Density Conservation Agents / Q000627:therapeutic use*; D001943:Breast Neoplasms / Q000453:epidemiology*; D004164:Diphosphonates / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D015994:Incidence; D008875:Middle Aged; D012306:Risk
D050071:Bone Density Conservation Agents; D004164:Diphosphonates; D019386:Alendronate