aspirin, nsaids, and prevention of colon cancer · pge-2, colon tumors, resistance to anti-tumor...
TRANSCRIPT
![Page 1: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/1.jpg)
Mechanistic Studies of Aspirin and Prevention of Colorectal Cancer
Andrew T. Chan, MD, MPH
Division of Gastroenterology Massachusetts General Hospital
National Cancer Institute
Board of Scientific Advisors & National Cancer Advisory Board
June 23, 2014
![Page 2: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/2.jpg)
Colonoscopy: Effective but with limits
No screening
Colonoscopy screening
All CRC 1.0 0.44 (0.38-0.52)
Distal colorectal 1.0 0.24 (0.18-0.32)
Proximal colon 1.0 0.73 (0.57-0.92)
Nishihara et al, NEJM 2013
![Page 3: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/3.jpg)
Aspirin and adenoma trials Trial N Duration Dose Relative Risk Baron, NEJM 2003
1121 prior adenoma
3 years 81 mg 325 mg
0.83 (0.70-0.98) 0.96 (0.81-1.13)
Sandler, NEJM 2003
635 prior CRC
3 years 325 mg 0.65 (0.46-0.91)
Benamouzig, Gastro 2003
272 prior adenoma
1 year 160 mg 300 mg
0.85 (0.57-1.26) 0.61 (0.37-0.99)
Logan, Gastro 2008
945 prior adenoma
3 years 300mg 0.79 (0.63-0.99)
Ishikawa, Gut 2014
311 prior adenoma
2 years 100 mg 0.60 (0.36–0.98)
![Page 4: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/4.jpg)
Nurses’ Health Study (n=121,700)
Health Professionals Follow-up Study (n=51,539)
Study population
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012
Diet Aspirin BMI Med. Hist. Tobacco
Diet Aspirin BMI Med. Hist. Tobacco
1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012
![Page 5: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/5.jpg)
Duration of aspirin use and risk of CRC
1.04 0.89
1.0
0.67 0.68
P for trend = <0.0001
Chan et al, JAMA 2005
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0 1 to 5 6 to 10 11 to 20 > 20
Years of regular aspirin use
Mul
tivar
iate
rela
tive
risk
![Page 6: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/6.jpg)
Colorectal Cancer
0 3 6 9 12 15 180
.002
.004
.006
.008
.010
.012
.014
.016
AspirinPlacebo
Follow-up YearsNo. at RiskAspirin 19934 19443 18868 17975 15592 14617Placebo 19942 19467 18857 17977 15424 14358
Cum
ulat
ive
Inci
denc
e
p = 0.02
Aspirin use reduces risk of CRC: 18 year follow-up of WHS Trial
Cook et al, Ann Int Med 2013
![Page 7: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/7.jpg)
Aspirin reduces CRC in Lynch after long-term follow-up
Burn et al, Lancet 2011
Intention-to-treat HR=0.63; p=.12
Poisson IRR = 0.56; p=.05
![Page 8: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/8.jpg)
Nurses’ Health Study (n=121,700)
Health Professionals Follow-up Study (n=51,539)
Diet Aspirin BMI Med. Hist. Tobacco
Diet Aspirin BMI Med. Hist. Tobacco
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012
1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012
N=1,279 with Stage I, II, III CRC
![Page 9: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/9.jpg)
Aspirin use and CRC patient survival
Chan et al, JAMA 2009
![Page 10: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/10.jpg)
Aspirin and risk of GI bleeding
1.0 1.01 1.21
1.59 1.83
P trend = <.0001
Huang et al. Am J. Med 2011.
0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8
0 0.5 to 1.5 2 to 5 6 to 14 > 14 Standard tablets of aspirin per week
Mul
tivar
iate
rela
tive
risk
![Page 11: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/11.jpg)
U.S. Preventative Services Task Force 2007
• Recommends against routine use of aspirin or NSAIDs to prevent CRC in average risk individuals
• “Harms outweigh the benefits for the prevention of CRC”
![Page 12: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/12.jpg)
• Prostaglandin balance
• Wnt signaling
Can we exploit mechanism to personalize chemoprevention?
![Page 13: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/13.jpg)
![Page 14: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/14.jpg)
Aspirin and risk of CRC by COX-2 expression
Non-Users Regular Users All CRC 1.0 0.73 (0.62-0.86)
COX-2 negative 1.0 0.96 (0.73-1.26)
P heterogeneity=0.02
Chan et al, NEJM 2007
COX–2 positive 1.0 0.64 (0.52-0.78)
![Page 15: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/15.jpg)
Aspirin and CRC-specific mortality among CRC patients
Non-Users Regular Users All CRC 1.0 0.71 (0.53-0.95)
COX-2 negative CRC 1.0 1.22 (0.36-4.18)
P heterogeneity=0.04
Chan et al, JAMA 2009
COX-2 positive CRC 1.0 0.39 (0.20-0.76)
![Page 16: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/16.jpg)
Aspirin has greater specificity for COX-2 positive cancers
Aspirin preferentially reduces the risk of CRC and the spread of tumors for which growth depends, at least in part, on COX-2 function
![Page 17: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/17.jpg)
![Page 18: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/18.jpg)
Aspirin and CRC-specific mortality among CRC patients
Non-Users Regular Users All CRC 1.0 0.71 (0.53-0.95)
PIK3CA wildtype CRC 1.0 0.93 (0.68-1.28)
P heterogeneity=0.01
Liao et al, NEJM 2012
PIK3CA mutant CRC 1.0 0.18 (0.05-0.60)
![Page 19: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/19.jpg)
Aspirin and recurrence-free survival among CRC patients in VICTOR
Non-Users Regular Users All CRC 1.0 0.71 (0.53-0.95)
PIK3CA wildtype CRC 1.0 0.94 (0.59-1.24)
P heterogeneity=0.02
Domingo et al, JCO 2013
PIK3CA mutant CRC 1.0 0.11 (0.01-0.83)
![Page 20: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/20.jpg)
![Page 21: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/21.jpg)
15-Hydroxyprostaglandin dehydrogenase and CRC
• Ubiquitously downregulated in CRC • Knockout of 15-PGDH in mice PGE-2, colon tumors, resistance to anti-tumor
effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance to anti-adenoma effect of celecoxib
Yan et al, PNAS 2004; Yan et al, PNAS 2009
![Page 22: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/22.jpg)
Assessment of 15-PGDH in normal colon mucosa
• RNA extracted from normal colon in CRC
resections • RT-PCR to quantitate 15-PGDH mRNA
expression
Fink et al, Dig Dis Sci 2013
![Page 23: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/23.jpg)
Aspirin and risk of CRC by 15-PGDH in normal colon
Non-Users Regular Users All CRC 1.0 0.73 (0.62-0.86)
Low 15-PGDH 1.0 0.90 (0.63-1.27)
P heterogeneity=0.02
Fink et al, Sci Trans Med 2014
High 15-PGDH 1.0 0.49 (0.34-0.71)
![Page 24: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/24.jpg)
15-PGDH risk-stratifies individuals for aspirin chemoprevention
Aspirin may preferentially reduce the risk of CRC among individuals with sufficient colonic 15-PGDH
![Page 25: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/25.jpg)
![Page 26: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/26.jpg)
Urinary PGE-M
• Urinary metabolites (PGE-M) accurately reflect
systemic prostaglandin balance • PGE-M previously associated with CRC and
adenoma
![Page 27: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/27.jpg)
Nurses’ Health Study (N=121,700)
Study population
Diet Aspirin
Urine collection N=18,743
Controls N=420
Matching factors 1) Age 2) Date of urine 3) Year of endoscopy 4) Reason for endoscopy
Exclusions 1) Prior cancer 2) IBD 3) Polyposis
Adenoma N=420
1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012
![Page 28: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/28.jpg)
Risk of advanced adenoma by urine PGE-M
Ptrend = .02 .0
Bezawada et al, Can Prev Res 2014
1.37 1.2
1.82
0 0.5
1 1.5
2 2.5
3 3.5
1 2 3 4
Quartiles of Urinary PGE-M
Mul
tivar
iate
Rel
ativ
e R
isk
1.00
![Page 29: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/29.jpg)
Aspirin/NSAID use and risk of advanced adenoma by urine PGE-M
Non-Users Regular Users Any PGE-M 1.0 0.76 (0.53-0.99)
Low PGE-M (Q1) 1.0 1.31 (0.62-2.76)
Bezwada et al, Can Prev Res 2014
High PGE-M (Q 2,3,4) 1.0 0.65 (0.45-0.94)
![Page 30: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/30.jpg)
PGE-M risk-stratifies for aspirin chemoprevention
Aspirin/NSAIDs primarily risk of advanced adenoma in those with urine PGE-M
![Page 31: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/31.jpg)
Can we exploit mechanism to personalize chemoprevention?
• Prostaglandin balance
• Wnt signaling
![Page 32: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/32.jpg)
![Page 33: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/33.jpg)
![Page 34: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/34.jpg)
![Page 35: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/35.jpg)
![Page 36: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/36.jpg)
GWAS hits for CRC
Position/Gene rs# Minor Allele MAF OR
(95%CI) P-value
8q24 rs6983267 T 0.50 0.83 (0.81-0.85) 7x10-30
18q21/SMAD7 rs4939827 T 0.49 0.85 (0.81-0.89) 1x10-28
15q13/CRAC1 (HMPS)
rs4779584 rs10318 T 0.18 1.26
(1.19-1.34) 4x10-14
10p14 rs10795668 A 0.33 1.25 (1.19-1.32) 3x10-13
8q23.3/EIF3H rs16892766 C 0.07 0.89 (0.86-0.91) 3x10-18
+ > 30 more
Tomlinson et al, Nat Gen 2007, 2008; Zanke et al, Nat Gen 2007; Tenesa et al, Nat Gen 2008; Broderick et al, Nat Gen 2007; Cogent et al, Nat Gen 2008; Houlston et al, Nat Gen 2010
![Page 37: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/37.jpg)
Pomerantz et al, Nat Genet 2009; Tuupanen et al, Nat Genet 2009
![Page 38: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/38.jpg)
Pomerantz et al, Nat Genet 2009; Tuupanen et al, Nat Genet 2009
![Page 39: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/39.jpg)
rs6983267 and risk of CRC
OR
(P trend, 0.02) (P trend, 0.03) (P trend, 0.002)
0
0.2
0.4
0.6
0.8
1
1.2
NHS HPFS All
GG GT
TT
GG
GT TT
GG
GT
TT
Nan et al, JNCI 2013
![Page 40: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/40.jpg)
rs6983267 and MYC expression
OR
GG
GT
TT
P trend=0.03
Nan et al, JNCI 2013
![Page 41: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/41.jpg)
Aspirin and risk of CRC risk by rs6983267 genotype
OR
P for interaction=0.01
0
0.2
0.4
0.6
0.8
1
1.2
All GG GT TT P<0.0001 P=0.96 P<0.0001 P=0.002
Non-users
Regular users
Non-users
Non-users
Non-users
Regular users
Regular users Regular
users
Nan et al, JNCI 2013
![Page 42: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/42.jpg)
![Page 43: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/43.jpg)
Rs6983267 risk stratifies for aspirin chemoprevention
• T allele risk of CRC and MYC expression
• Benefit of aspirin on CRC appears limited to individuals ≥ one T allele
![Page 44: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/44.jpg)
Summary • Overwhelming evidence supports a
benefit of aspirin on CRC development • Aspirin may improve CRC survival • Mechanisms by which aspirin prevents
cancer can be exploited to risk-stratify for chemoprevention
![Page 45: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/45.jpg)
Acknowledgements
• UM CA167552, P01 CA087969,P50 CA127003, R01 CA137178, K07 CA107412
• Participants of NHS and HPFS • Co-investigators/Collaborators
– Shuji Ogino – Walter Willett – Charlie Fuchs – Ed Giovannucci
![Page 46: Aspirin, NSAIDS, and Prevention of Colon Cancer · PGE-2, colon tumors, resistance to anti-tumor effect of celecoxib • Pilot study in APC Trial 15-PGDH in normal colon = resistance](https://reader033.vdocuments.mx/reader033/viewer/2022043001/5f78e2ab72bade3cc6051433/html5/thumbnails/46.jpg)
MGH/DFHCC/HSPH Translational Epidemiology Group
• Faculty – Hongmei Nan, Reiko Nishihara, Manish Gala
• Fellows – Xabier Garcia-de-Albeniz, Linda Hiraki, Ed Huang, Amit Joshi, Hamed Khalili, Xiaomei Liao
• Doctoral students – Mingyang Song • Medical students – Navya Bezawada,
Raaj Mehta