17
4/5/16 1 Development of New Treatment for Prostate Cancer W. Douglas Figg, Pharm.D. Center for Cancer Research National Cancer Institute National Institutes of Health, Bethesda, MD USA Disclosure Dr. Figg has no personal financial interest to disclose However, the NCI has licensed one of Dr. Figg’s patents to Celgene. Furthermore, the NCI has several CRADAs with pharamaceutical/biotech companies to support research in Dr. Figg’s laboratory. None of those data will be presented today The continuing education is managed and accredited by Professional Education Services Group in cooperation with The NIH Pharmacy Department. PESG, NIH, and all accrediting organization do not support or endorse any product or services mentioned in this activity. PESG and the NIH staff have no financial interest to disclose Learning Objectives 1. Describe the current treatment options for metastatic prostate cancer 2. Discuss the role of androgens and androgen transport plays in driving castration-resistant prostate cancer 3. Describe the regulation of OATP1B3 and the impact of genetic variations on androgen deprivation therapy 4. Describe the pathway from target identification, to screening for new agents, to preclinical evaluation and early phase clinical trials. Prostate Cancer Leading non-cutaneous cancer for men 220,800 men in US will be diagnosed* 27,540 men will die of prostate cancer each year* 91% are diagnosed with localized disease Local treatment: Surgery or XRT 15% - 35% will develop biochemical recurrence SEER estimate for 2015 Journal of Urology 1941 Prostate Cancer is Hormone-Dependent Prostate function depends on androgens Castration or estrogen led to glandular atrophy which could be reversed with androgens Patients with metastatic prostate cancer benefited from castration or estrogens Clarence Hodges 1914-2001 Medical student in the Huggins Lab and co-author of the J Urology paper Charles Huggins 1901-1997 Nobel Prize 1966 for that discovery Disease Continuum in Prostate Cancer Tumor volume Time Castra/on (Medical or Surgical) Docetaxel Death Radical/ XRT Metasta/c Symptoms Castra/on Resistant NonMetasta/c Asymptoma/c Castra/on Sensi/ve 2 nd line Hormonal therapy SipuleucelT Cabazitaxel Abiraterone Enzalutamide Alpharadin

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Page 1: Figg Pharmacotherapy Presentation Handout

4/5/16

1

Development of New Treatment for Prostate Cancer

W. Douglas Figg, Pharm.D. Center for Cancer Research

National Cancer Institute National Institutes of Health,

Bethesda, MD USA

Disclosure Dr. Figg has no personal financial interest to disclose

However, the NCI has licensed one of Dr. Figg’s patents to Celgene. Furthermore, the NCI has several CRADAs with pharamaceutical/biotech companies to support research in Dr. Figg’s laboratory. None of those data will be presented today

The continuing education is managed and accredited by Professional Education Services Group in cooperation with The NIH Pharmacy Department. PESG, NIH, and all accrediting organization do not support or endorse any product or services mentioned in this activity.

PESG and the NIH staff have no financial interest to disclose

Learning Objectives

1. Describe the current treatment options for metastatic prostate cancer 2. Discuss the role of androgens and androgen transport plays in driving castration-resistant prostate cancer 3. Describe the regulation of OATP1B3 and the impact of genetic variations on androgen deprivation therapy 4. Describe the pathway from target identification, to screening for new agents, to preclinical evaluation and early phase clinical trials.

Prostate Cancer

•  Leading non-cutaneous cancer for men •  220,800 men in US will be diagnosed* •  27,540 men will die of prostate cancer each year* •  91% are diagnosed with localized disease •  Local treatment: Surgery or XRT •  15% - 35% will develop biochemical recurrence

SEER estimate for 2015

Journal of Urology 1941 Prostate Cancer is Hormone-Dependent

•  Prostate function depends on androgens

•  Castration or estrogen led to glandular atrophy which could be reversed with androgens

•  Patients with metastatic prostate cancer benefited from castration or estrogens

Clarence Hodges 1914-2001 Medical student in the Huggins Lab and co-author of the J Urology paper

Charles Huggins 1901-1997 Nobel Prize 1966 for that discovery

Disease Continuum in Prostate Cancer

Tumor    volume  

Time  

Castra/on  (Medical  or  Surgical)  

Docetaxel  

Death  

Radical/  XRT  

Metasta/c  

Symptoms  

Castra/on  Resistant  

Non-­‐Metasta/c  

Asymptoma/c  

Castra/on  Sensi/ve  

2nd-­‐line  Hormonal  therapy  

Sipuleucel-­‐T  

Cabazitaxel  Abiraterone  Enzalutamide  Alpharadin  

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2

FDA  Approvals  -­‐  mCRPC  Indica/ons    First  Line  Treatment  – Docetaxel  –  2004  

•  Plus  Prednisone  •  Plus  Estramus/ne  

–  Sipuleucel-­‐T  -­‐  2010  •  Asymptoma/c  or  minimally  symptoma/c  

–  Radium-­‐223  –  2013  •  Symptoma/c  bone  metastasis  

– Abiraterone  –  2013  •  Plus  Prednisone  

–  Enzalutamide  -­‐  2014  

Second  Line  Treatment  (Indica/on  based  on  prior  docetaxel  treatment)  

– Cabazitaxel  –  2010  •  Plus  Prednisone  

– Abiraterone  –  2011  •  Plus  Prednisone  

– Enzalutamide  –  2012  

TAX-327 – Docetaxel Efficacy Endpoints

Tannock  IF,  et.  al.  NEJM  2004;351(15):1502-­‐1512  

TAX-327 – Docetaxel

Safety and Tolerability

Tannock  IF,  et.  al.  NEJM  2004;351(15):1502-­‐1512  

SWOG 99-16 – Docetaxel + Estramustine Overall Survival

Petrylak  DP  et.  al.  NEJM  2004;351(15):1513-­‐1520  

TROPIC – Cabazitaxel + Prednisone Overall Survival

De  Bono  JS,  et.  al.  Lancet  2010;376:1147-­‐54  

TROPIC – Cabazitaxel + Prednisone Overall Survival – Subgroup Analysis

De  Bono  JS,  et.  al.  Lancet  2010;376:1147-­‐54  

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3

TROPIC – Adverse Events

De  Bono  JS,  et.  al.  Lancet  2010;376:1147-­‐54  

Cholesterol

Pregnenolone

17α-OH-pregnenolone 17α-OH-progesterone

Progesterone Aldosterone

Cortisol

Androstenedione

DHT

CYP17

Androstenediol Testosterone

DHEA

HSD17B2/3

HSD3B1/2

SRD5A1/2/3

HSD3B1/2

HSD3B1/2

CYP17

CYP17 CYP17

HSD17B2/3

CYP1B1, CYP3A,CYP3A5, CYP3A43

metabolites

CYP19 estradiol

CYP19 estone

3β-diol 3α-diol

3α-dG

HSD3BAndrostanedione

HSD17B

SRD5A1

AndrosteroneHSD17B3

HSD17B2/3

HSD3B1/2

HSD3B

Androgen Pathway and Genes Involved in Androgen Biosynthesis and Metabolism

COU-AA-301 – Abiraterone Post-Chemotherapy Efficacy Endpoints

De  Bono  JS,  et.  al.  NEJM  2011;364:1995-­‐2005  

COU-AA-301 – Abiraterone Adverse Events

De  Bono  JS,  et.  al.  NEJM  2011;364:1995-­‐2005  

COU-AA-302 - Abiraterone

1st Line

Ryan  CJ,  et.  al.  NEJM  2013;368(2):138-­‐148  

COU-AA-302 – Abiraterone Adverse Events

Ryan  CJ,  et.  al.  NEJM  2013;368(2):138-­‐148  

Page 4: Figg Pharmacotherapy Presentation Handout

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4

T or DHT

AR

OATP1B3

Nucleus

Androgen Diffusion Androgen transportA. B.

Androgens Prostate Cancer

Enzalutamide

AFFIRM – Enzalutamide (Post-Chemo)    

Scher  HI,  et.  al.  NEJM  2013;367(13):1187-­‐1188  

AFFIRM – Enzalutamide Adverse Events

Scher  HI,  et.  al.  NEJM  2013;367(13):1187-­‐1188  

PREVAIL – Enzalutamide 1st Line

Beer  TM,  et.  al.  NEJM  2014;371(5);424-­‐433    

PREVAIL – Enzalutamide Adverse Events

Beer  TM,  et.  al.  NEJM  2014;371(5);424-­‐433    

PREVAIL - Enzalutamide

Beer  TM,  et.  al.  NEJM  2014;371(5);424-­‐433    

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Journal of Urology 1941 Prostate Cancer is Hormone-Dependent

•  Prostate function depends on androgens

•  Castration or estrogen led to glandular atrophy which could be reversed with androgens

•  Patients with metastatic prostate cancer benefited from castration or estrogens

Clarence Hodges 1914-2001 Medical student in the Huggins Lab and co-author of the J Urology paper

Charles Huggins 1901-1997 Nobel Prize 1966 for that discovery

Failure to ADT was Thought to Result in Androgen Independent, Androgen Insensitive and Hormone

Refractory Disease

Urology 1995

Charles Sawyers (Nature Med 2004): Increased androgen receptor confers resistance to anti-androgen therapy

For 80 years androgens were thought to enter cell only by passive diffusion

Passive  diffusion  

Testosterone  

Testosterone  

 

DHT    

 

For 80 years androgens were thought to enter cell only by passive diffusion –

Is it possible there is more to the story?                  

Passive  diffusion  

Testosterone  

 

Organic Anion Transporting Polypeptides

u  Family of 11 transporters u  Encoded by SLC genes u  Xenobiotics: >100 drugs comprising >15 classes are

known to be transported by OATPs

Sissung  TM  et  al.  (Figg)  Mol  Biotechnol  2010  

Page 6: Figg Pharmacotherapy Presentation Handout

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6

OATP1B3  (formerly  known  as  OATP8)  is  a  Liver  Protein  Encoded  by  SLCO1B3  (formerly  known  as  

SLC21A8)  

OATP1B3  is  “liver-­‐specific”  

Konig  et  al.  J  Biol  Chem  2000  

OATP1B3 is a Liver Transporter      

Smith NF et al. (Figg) Expert Opin Drug Metab Toxicol 2005

Expressed on basolateral membrane of hepatocyte Involved in “uptake” of substrates

Membrane Expression of OATP1B3 in the Liver    

 

OATP1B3 antibody (H-52): sc-98981, which is a rabbit polyclonal antibody raised against amino acids 651 – 702 mapping at the C-terminus of OATP1B3 of human origin. The dilution we used was 1:100 and the antigen retrieval was performed using the steamer with sodium citrate buffer at pH 6.0.

SLCO1B3 Gene Coding Region Variants Nucleotide Change AA Change Exon

69C>T Arg23Arg 1 334T>G Ser112Ala 3 439A>G Thr147Ala 4 699G>A Met233Ile 6 759T>A Arg253Arg 7 767G>C Gly256Ala 7 924A>T Thr308Thr 7

1557A>G Ala519Ala 11 1559A>C His520Pro 11 1593A>G Thr531Thr 11 1614T>C Val538Val 11 1679T>C Val560Ala 11 1833G>A Gly611Gly 13 1997G>A Ser659Ser 14

Polymorphisms in the OATP1B3 Protein

Two Major SNPs are in Complete Linkage Disequilibrium of 334T>G (exon 3 - Ser112Ala) and

699G>A (exon 6 - Met233Ile)

Ethnic Groups Haplotype 334T>G 699G>A Frequency European Caucasian 1 G A 0.804

2 T G 0.168 3 T A 0.021 4 G G 0.005

American Caucasian 1 G G 0.878 2 T G 0.122

Smith N et al. (Figg) Clin Pharmcol Ther 2007

Caucasians 97% to 99% linkage

Page 7: Figg Pharmacotherapy Presentation Handout

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7

Substrates of OATP1B3 •  Billirubin •  BQ-123 •  Bromosulfophthalein •  Cholylcystokinin 8 •  Deltorphin II •  Demthylphalloin •  Dehydroepiandrosterone

Sulfate •  Digoxin •  Dihydromicrocystin-LR •  Docetaxel •  D-penicillamin enkephalin •  Fluo-3 •  Glycholate •  Leukotriene C4

 

•  Methotrexate •  Monoglucuronosyl bilirubin •  Estradiol-17β-Glucuronide •  Estrone-3-sulfate •  Ouabain •  Paclitaxel •  Pitavastatin •  Rifampin •  Taurocholate •  T3 (triiodothronine) •  T4 (thyroxin)

Smith  NF  et  al.  (Figg)  Expert  Opin  Drug  Metab  Toxicol  2005  

SNPs in SLCO1B3 Effect on Pharmacokinetics

•  Is there a difference in the PK of docetaxel between wild-type and variant?

SNPs in SLCO1B3 Effect on Pharmacokinetics

•  Is there a difference in the PK of docetaxel between wild-type and variant? NO

SNPs in SLCO1B3 Effect on Pharmacokinetics  

•  Is there a difference in the PK of docetaxel between wild-type and variant?

•  But we did see a difference in overall survival between the two groups (wild-type and variant)

Substrates of OATP1B3 •  Billirubin •  BQ-123 •  Bromosulfophthalein •  Cholylcystokinin 8 •  Deltorphin II •  Demthylphalloin •  Dehydroepiandrosterone

Sulfate (DHEA) •  Digoxin •  Dihydromicrocystin-LR •  Docetaxel •  D-penicillamin enkephalin •  Fluo-3 •  Glycholate •  Leukotriene C4

 

•  Methotrexate •  Monoglucuronosyl bilirubin •  Estradiol-17β-Glucuronide •  Estrone-3-sulfate •  Ouabain •  Paclitaxel •  Pitavastatin •  Rifampin •  Taurocholate •  T3 (triiodothronine) •  T4 (thyroxin)

Smith  NF  et  al.  (Figg)  Expert  Opin  Drug  Metab  Toxicol  2005  

Is OATP1B3 Expressed in Prostate Tissue by Immunofluorescence?

Goat polyclonal OATP1B3 primary antibody  

Hamada  et  al.  (Figg)  Clin  Cancer  Res  2008  

Page 8: Figg Pharmacotherapy Presentation Handout

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8

Is there a difference in OATP1B3 SNP frequency between patients with cancer and normal volunteers?

Is there a difference in OATP1B3 SNP frequency between patients with cancer and normal volunteers? NO

In patients with prostate cancer, is there a difference in outcome between those with wild-type and those with variant?

Clinically OATP1B3 Polymorphisms Affect Outcome

Hamada et al. (Figg) Clin Cancer Res 2008  

Sharifi et al. (Figg) Br J Urology 2008  

Overall Survival   Development of CRPC  

334 T>G (n=180)

var/var – decrease transport function

GG TT, TG

                             

TT, GG = 45/180, 6.4years vs. GG = 135/180, 8.5 years (p=0.020)

No difference in age at diagnosis Gleason score or clinical stage at diagnosis between the two groups

Clinically OATP1B3 Polymorphisms Affect Outcome

Hamada et al. (Figg) Clin Cancer Res 2008  

Sharifi et al. (Figg) Br J Urology 2008  

Survival   Development of CRPC  

334 T>G

GG – decrease function TT, TG

                             

(n=68)

We next asked “Does OATP1B3 Transport Testosterone?”

•  OATP1B3 polymorphisms are related to nearly two-fold increased uptake of testosterone with the 334T-allele vs. the 334G-allele.

•  Transient transfection cells

Wt Heterozygote Homo

Hamada et al. (Figg) Clin Cancer Res 2008

l

Page 9: Figg Pharmacotherapy Presentation Handout

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9

Chae YJ et al. J Pharmaceut Sci 2012

Korean Group replicated our initial findings in 2012 for Testosterone Uptake

T or DHT

AR

Nucleus

Androgen DiffusionA. B.

OATP1B3 in Prostate Cancer

T or DHT

AR

OATP1B3

Nucleus

Androgen Diffusion Androgen transportA. B.

OATP1B3 in Prostate Cancer

Originally Pressler et al. (Figg) PLoSOne 2011, but repeated with new primers in 2015

Which Normal Tissues/Cancers Express SLCO1B3?

384 RNA samples encompassing 22 different tumor types with matched normal tissue

Pressler et al. (Figg) PLoSOne 2011

Which Normal Tissues/Cancers Express SLCO1B3?

SLCO1B3 RNA is frequently expressed in normal hepatic tissues and testis Pressler et al. (Figg) PLoSOne 2011

Which Normal Tissues/Cancers Express SLCO1B3?

SLCO1B3 RNA is frequently expressed in liver, pancreas, prostate and testicular cancer

Page 10: Figg Pharmacotherapy Presentation Handout

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10

Pressler et al. (Figg) PLoSOne 2011

Which Normal Tissues/Cancers Express SLCO1B3?

SLCO1B3 RNA is occasionally expressed (less than 20%) in esophagus, lung, ovarian and bladder cancer Pressler et al. (Figg) PLoSOne 2011

Which Normal Tissues/Cancers Express SLCO1B3?

But prostate goes from no expression in normal tissue to more than 50% of the tumors expressing SLCO1B3

SLCO1B3 HRE HRE ARE

Putative Hypoxia and Androgen Regulatory Elements located upstream of SLCO1B3

What Regulates Expression? SLCO1B3 Expression in Prostate Cancer Cell Lines  

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

SLCO1B3                                                                                                                          ct-­‐SLCO1B3  

CRPC cell lines express ~100- to 1,000-fold more SLCO1B3 than do hormone sensitive prostate cancer cell lines

SLCO1B3 Expression in Prostate Cancer Cell Lines  

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

SLCO1B3                                                                                                                          ct-­‐SLCO1B3  

Cobalt chloride is a chemical inducer of hypoxia-like response Cobalt chloride had no affect on SLCO1B3

SLCO1B3 Expression in Prostate Cancer Cell Lines

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

lt-­‐SLCO1B3                                                                                                                          ct-­‐SLCO1B3                    

Dog

Dog

Chetomin (CTM) has been shown by our group to block the interaction of HIF and p300 [Cook et al. (Figg) J Biol Chem 2009] We hypothesized it would block the effect of hypoxia

Page 11: Figg Pharmacotherapy Presentation Handout

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SLCO1B3 Expression in Prostate Cancer Cell Lines

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

SLCO1B3                                                                                                                          ct-­‐SLCO1B3  

Dog

Dog

Chetomin increased the expression of SLCO1B3 in the two hormone sensitive cell lines (LNCaP and 22Rv1) Chetomin slightly decreased the expression of SLCO1B3 in the two CRPC cells lines (PC3 and DU145)

SLCO1B3 Expression in Prostate Cancer Cell Lines

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

SLCO1B3                                                                                                                          ct-­‐SLCO1B3  

The combination of CTM and CoCl2 increased the expression of OATP1B3 in the 22Rv1 cell line, but had no effect on the other three cell lines

Is OATP1B3 and HIF1α Colocalized in Prostate Tissue? The answer is yes based on IHC staining

OATP1B3   HIF1A   No  primary  Ab  

OATP1B3   HIF1A   No  primary  Ab  

What Regulates Expression?  

So we are still trying to understand what regulates OATP1B3 -

androgens don’t seem to play a role; however, p300 seems to play a role (and HIF to a lesser extent)

Cholesterol

Pregnenolone

17α-OH-pregnenolone 17α-OH-progesterone

Progesterone Aldosterone

Cortisol

Androstenedione

DHT

CYP17

Androstenediol Testosterone

DHEA

HSD17B2/3

HSD3B1/2

SRD5A1/2/3

HSD3B1/2

HSD3B1/2

CYP17

CYP17 CYP17

HSD17B2/3

CYP1B1, CYP3A,CYP3A5, CYP3A43

metabolites

CYP19 estradiol

CYP19 estone

3β-diol 3α-diol

3α-dG

HSD3BAndrostanedione

HSD17B

SRD5A1

AndrosteroneHSD17B3

HSD17B2/3

HSD3B1/2

HSD3B

Androgen Pathway and Genes Involved in Androgen Biosynthesis and Metabolism

Cholesterol

Pregnenolone

17α-OH-pregnenolone 17α-OH-progesterone

Progesterone Aldosterone

Cortisol

Androstenedione

DHT

CYP17

Androstenediol Testosterone

DHEA

HSD17B2/3

HSD3B1/2

SRD5A1/2/3

HSD3B1/2

HSD3B1/2

CYP17

CYP17 CYP17

HSD17B2/3

CYP1B1, CYP3A,CYP3A5, CYP3A43

metabolites

CYP19 estradiol

CYP19 estone

3β-diol 3α-diol

3α-dG

HSD3BAndrostanedione

HSD17B

SRD5A1

AndrosteroneHSD17B3

HSD17B2/3

HSD3B1/2

HSD3B

Androgen Pathway and Genes Involved in Androgen Biosynthesis and Metabolism

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Androgen Uptake in OATP1B3 Expressing CHO Cells

Km is the concentration that yields half-maximal velocity and Vmax is the maximum velocity in Chinese hamster ovary cells

Testosterone          Dihydrotestosterone   Androstenedione  

Androstenedione  

Dihydrotestosterone  

Testosterone  

Using the Knowledge that Chetomin Upregulates OATP1B3 in LNCaP Cells

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

lt-­‐SLCO1B3                                                                                                                          ct-­‐SLCO1B3  

Chet

omin

3H-Testosterone Uptake in LNCaP Cells

Chetomin increased Testosterone uptake at 30 min and 60 min

30 min after 3H-T addition 60 min after 3H-T addition

Time (hr) post-treatment Time (hr) post-treatment

Doxycycline-induced OATP1B3 Lentiviral inducible expression system

LNCaP Cells 22Rv1 Cells

Does Testosterone Affect Cell Proliferation in OATP1B3 Expressing Cells?

Lentiviral inducible expression system

CDSFBS

25pM

250p

M2.5

nM25

nM0

50000

100000

150000

Day 2: Testosterone

Cel

l Cou

nt

NO DOXDOX

Preliminary

Testosterone Plasma Concentration in OATP1B3 Knock-Out/Knock-In Mice

Higher AUC in KO: 112 vs 96 hr*nmol/L; p=0.00048

slco1a/b  cluster  knockout  mice  with  humanized  SLCO1B3  knock-­‐in    Preliminary

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Liver Testosterone Concentration is Higher in OATP1B3 Knock-In Mice

slco1a/b  cluster  knockout  mice  with  humanized  SLCO1B3  knock-­‐in    Preliminary

AUC0-60 of T in liver is 1316 vs 1150 hr*nmol/L in Knock-in vs Knock-out (p=0.0005)

Ursolic  acid  was  selected  as  the  most  selec/ve  OATP1B3  inhibitor.  

§  Steroid hormone backbone structure (triterpine)

§  Peels of fruits (e.g., apples) and in herbs (e.g., rosemary)

§  1449 PubMed cites, many describing biochemical effects: •  May have a role in the PK interactions with grapefruit juice and

CYP3A4 substrates. CYP3A4 inhibition <10uM •  Tumor apoptosis •  Aromatase inhibition •  Inhibition of cell signaling

Ursolic Acid Inhibition of Uptake with Ursolic Acid in OATP1B3 Expressing CHO Cells

Ki  is  the  inhibi/on    dissocia/on  constant  in  Chinese    hamster  ovary  cells  

Androstenedione  

Dihydrotestosterone  

Testosterone  

Androstenedione  Dihydrotestosterone  Testosterone  

3H-Testosterone Uptake in LNCaP Cells

30 min after 3H-T addition 60 min after 3H-T addition

Ursolic Acid inhibited Testosterone uptake at 30 min and 60 min

Time (hr) post-treatment Time (hr) post-treatment

siRNA for SLCO1B3 decreased 3H-Testosterone Uptake in DU145 Cells  

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

Rel

ativ

e G

ene

Exp

ress

ion

Log(

100,

000*

2^-d

Ct)

Untrea

tedCoC

l2CTM

CoCl2

+ CTM

0

1

2

3

4LNCaP22Rv1PC3DU145

SLCO1B3                                                                                                                          ct-­‐SLCO1B3  

0  

0.01  

0.02  

0.03  

0.04  

0.05  

0.06  

10 min

[T]/[

prot

ein]

(nM

/ug)

Time

Du145  

No Treatment

Knockdown

Knockdown + UA

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Disease Continuum in Prostate Cancer

Tumor    volume  

Time  

Castra/on  (Medical  or  Surgical)  

Docetaxel  

Death  

Radical/  XRT  

Metasta/c  

Symptoms  

Castra/on  Resistant  

Non-­‐Metasta/c  

Asymptoma/c  

Castra/on  Sensi/ve  

2nd-­‐line  Hormonal  therapy  

Sipuleucel-­‐T  

Cabazitaxel  Abiraterone  Enzalutamide  Alpharadin  

+  OATP1B3  Inhibitor  

OATP1B3 Inhibitor Screen Primary  screen:  Natural  product  extracts  (n=209,859)  Small  molecules  (n=67,391)  

MTX-­‐Fluorescein   INHIBITOR  

Tetracyclin-­‐inducible  OATP1B3-­‐GFP      in  LNCaP  

GFP

+  doxycycline  vs  

-­‐  doxycycline  

OATP1B3 Inhibitor Screen Primary  screen:  Natural  product  extracts  (n=209,859)  Small  molecules  (n=67,391)  

Secondary  screen  (mulSple  cell  lines,  [3H]-­‐androgens:  Top  ~25  hits  from  the  primary  screen  

+  doxycycline  vs  

-­‐  doxycycline  

[3H]-­‐androgen   INHIBITOR  

Tetracyclin-­‐inducible  OATP1B3-­‐GFP    in  LNCaP,  22Rv1,  LAPC-­‐4  

GFP

OATP1B3 Inhibitor Screen Primary  screen:  Natural  product  extracts  (n=209,859)  Small  molecules  (n=67,391)  

TerSary  screen  (ARE-­‐luciferase  reporter  assay):  Hits  from  secondary  screen  (n=?)   LNCaP  (+  doxyxcycline)  

vs  LNCaP  (-­‐  doxycycline)  

Androgen   INHIBITOR  

AR  

Nucleus  

ARE  luc  

GFP

Secondary  screen  (mulSple  cell  lines,  [3H]-­‐androgens:  Top  ~25  hits  from  the  primary  screen  

Eovist

•  Gadoxetate disodium (Eovist, Bayer) is an MRI imaging agent which is FDA-approved for detecting hepatocellular carcinoma (HCC)

•  Normal hepatocytes express OATP1B3 while some HCC lesions do not

•  Those HCCs that do take up Eovist have been shown to express OATP1B3

Eovist in HCC

Pre-Eovist Post-Eovist

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Eovist

• We asked

Could Eovist help elucidate OATP1B3 clinical function in patients with prostate cancer?

Eovist

•  Eovist imaging trial is currently accruing (n=19 enrolled) –  Image 10 patients with localized disease –  Image 10 patients with metastatic CRPC patients

•  All patients required biopsy of tumor and OATP1B3 IHC staining

Eovist Patient #2: 72 y/o male with localized prostate cancer PSA 18.41, Gleason 4+4=8, clinical T2a

* Numerous blastic bony metastases Left iliac bone lesion shows no 18F-NaF uptake by PET/CT

Eovist Patient #15 - 70yo with CRPC

Baseline T1W MRI 60 minute post-Eovist injection T1W MRI

Left iliac lesion shows delayed phase Eovist uptake Is that lesion a lytic lesion rather than a blastic lesion?

Left iliac bony lesion was biopsied under CT guidance - result was metastatic poorly-differentiated carcinoma consistent with prostatic adenocarcinoma

Baseline T1W MRI 60 minute post-Eovist injection T1W MRI

Left iliac lesion shows delayed phase Eovist uptake Is that lesion a lytic lesion rather than a blastic lesion?

Left iliac bony lesion was biopsied under CT guidance - result was metastatic poorly-differentiated carcinoma consistent with prostatic adenocarcinoma

These data support that OATP1B3 is expressed clinically in prostate cancer and is a functional transporter in patients

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Trial Treatment OS (mo) NCI Thalidomide 18.0 Tannock Docetaxel-P 18.9

Why has our Triple Therapy Regimen Been More Active than some Combination Regimens in CRPC

Trial Treatment OS (mo) MAINSAIL Docetaxel-P/Lenalidomide 17.7 NCI Thalidomide 18.0 Tannock Docetaxel-P 18.9 VENICE Docetaxel-P/Aflibercept 22.1 CALGB Docetaxel-P/Bevacizumab 22.6

Why has our Triple Therapy Regimen Been More Active than some Combination Regimens in CRPC

Trial Treatment OS (mo) MAINSAIL Docetaxel-P/Lenalidomide 17.7 NCI Thalidomide 18.0 Tannock Docetaxel-P 18.9 VENICE Docetaxel-P/Aflibercept 22.1 CALGB Docetaxel-P/Bevacizumab 22.6 NCI Docetaxel-P/Bev/Lenalidomide 24.6 NCI Docetaxel-P/Estra/Thalidomide 24.7 NCI Docetaxel-P/Thalidomide 26.4 NCI Docetaxel-P/Bev/Thalidomide 28.2

Why has our Triple Therapy Regimen Been More Active than some Combination Regimens in CRPC Selected  testosterone-­‐related  mechanisms  for  

maintaining  AR  signaling  during  ADT  

Normal  regula/on  

nuc   AR  

T  (from  testes)  

DHT  

nuc   AR-­‐mut  

T  (low  conc.)  

DHT  DHEA  

AR-­‐muta/on  confers  androgen  promiscuity  

AR-­‐overexpression  confers  hypersesi/vity  during  ADT  

nuc   AR  

T  (low  conc.)  

DHT  AR  AR  

nuc   AR  

T  (from  tumor)  

DHT  

T  T  

T  

T  

Increased  intratumoral  androgen  produc/on  

Testosterone  scavenging  mechanisms  (e.g.  thru  OATP1B3  

and  OATP2B1)  

nuc   AR  

T  (low  conc.)  

DHT  

A.   B.  

Normal  

C.  

D.   E.  

Bedside Bench

Bedside Bench Acknowledgements for OATP Project

Statistics Sect, NCI Seth Steinberg David Venzon Pathology, NCI Maria Merino Vanessa Moreno Imaging Program, NCI Pete Choyke Baris Turkbey Clinical Colleagues, NCI Bill Dahut Rave Madan James Gulley Univ. of Pisa Romano Danesi VCU Jurgen Venitz

Figg Laboratory, NCI Tristan Sissung Cindy Chau Douglas Price Cody Peer Alex Sparreboom* Nima Sharifi* Akinobu Hamada* Ariel Ley Jon Strope Edel McCrea Shaunna Beedie Julie Barnes Kellie Reece* Sarah Troutman* Shawn Spencer* Nicola Smith* Tyler Kirkland* Caitlin Baum* Andrew Goey Tessa Campbell* Linda Johnson* Alesia Holly

* Left the NCI

Univ. Vienna Walter Jager Steffan Brenner Univ. Kentucky Wooin Lee Lab Cancer Biol & Genetics, NCI Ji Luo Lab of Cell Biology, NCI Suneet Shukla

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Disclosure

Obtaining CME/CE Credit If you would like to receive continuing education credit for this activity, please visit: http://nih.cds.pesgce.com

Thank You!

Questions