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Abstract Number: 2749

A Phase 1 Study of FPA008, an Anti-Colony Stimulating Factor 1 Receptor (anti-CSF1R) Antibody in Patients (pts) with Rheumatoid Arthritis (RA): Preliminary Results

Lei Zhou1, Robert Sikorski1, Seema Rogers1, Stefan Costin2, Mariusz Korkosz3, Maria Jaraczewska-Baumann4, Péterfai Éva5, Bernadette Rojkovich6, Janos Bartalos7, Emma Masteller1, Hong Xiang1, Brian Wong1 and Julie Hambleton1, 1Five Prime Therapeutics, Inc., South San Francisco, CA, 2PRA Heath Sciences, Berlin, Germany, 3Malopolskie Centrum Medyczne, The University Hospital in Krakow, Krakow, Poland, 4MedPolonia Sp. z o.o, Poznan, Poland, 5Drug Research Center, Balatonfüred, Hungary, 6Hospitaller Brothers of St. John of God, Budapest, Hungary, 7PRA Hungary Ltd, Budapest, Hungary

Meeting: 2015 ACR/ARHP Annual Meeting

Date of first publication: September 29, 2015

Keywords: DMARDs, Macrophage, monoclonal antibodies, osteoclasts and rheumatoid arthritis (RA)

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Session Information

Date: Tuesday, November 10, 2015

Session Title: Rheumatoid Arthritis - Small Molecules, Biologics and Gene Therapy Poster III

Session Type: ACR Poster Session C

Session Time: 9:00AM-11:00AM

Background/Purpose: FPA008 is a humanized IgG4 anti-CSF1R antibody that blocks the binding of CSF1 and IL34 ligands to CSF1R, resulting in inhibition of the activation and survival of inflammatory macrophages and osteoclasts, thus providing a potential therapeutic benefit in RA. Data from healthy volunteers in this 3-part Phase 1 study were reported previously (J Hambleton et al., ACR Annual Meeting 2014). Here, we report preliminary results from Part 3 in RA pts.

Methods: Part 3 consists of open-label dose escalation and randomized portions. In the open-label portion, FPA008 is being evaluated at 1, 3, and 6 mg/kg IV every 14 days for 2 or 3 doses. Three to 9 RA pts without adequate response to biologic or nonbiologic disease modifying anti-rheumatic drugs (DMARDs) are treated in each dose cohort.  All pts are required to be on stable dose methotrexate (MTX) during the study.  ACR 20/50/70, EULAR responses as well as change in DAS 28 from baseline and MRI are assessed at wks 4 and 12. The randomized portion will be based upon the open-label results.

Results:  As of May 13, 2015, 3 pts each were treated with FPA008 at 1 or 3 mg/kg for 2 doses. The median age was 59, ranging from 53 to 66 yrs old. Five were female and one was male. No pts had prior biologic DMARDs. Median MTX dose was 17.5 mg, ranging from 10 mg to 25 mg wkly with 3 pts requiring methylprednisolone 2 to 4 mg daily. All 3 pts receiving 1 mg/kg completed the study (through Study Day 141) and all 3 pts receiving 3 mg/kg completed the Study Day 85 visit. Reduction in CD14+CD16++ nonclassical monocytes were observed as expected. Reported treatment-related AEs were periorbital edema/eyelid edema  in the 3 mg/kg cohort and all were self-limiting.  Expected, reversible dose-dependent asymptomatic elevations of AST, ALT, LDH and CK were noted, but not associated with abnormalities in total bilirubin, troponin, aldolase or EKGs.

Preliminary efficacy data are reported below:

FPA008 Dose Cohort

Day-1

Week 4

Week 12

Dose regimen

Subjects

DAS28CRP

ACR 20/50/70

ACR hybrid

EULAR

DAS28CRP

DAS28 change

ACR 20/50/70

ACR Hybrid

EULAR

DAS28CRP

DAS28 change

1 mg/kg x 2 doses

3101

3.44

0

-5.14%

no

3.74

-0.31

0

-6.00%

no

3.83

-0.39

3102

4.35

0

11%

moderate

3.26

1.09

0

6.29%

moderate

3.22

1.13

3103

7.06

ACR50

52.86%

moderate

3.87

3.19

ACR50

53.86%

moderate

5.22

1.83

3 mg/kg x 2 doses

3104

4.17

ACR 20

49.99%

good

2.94

1.23

0

19.99%

moderate

3.55

0.62

3105

5.40

0

19.99%

good

2.28

3.12

0

8.57%

moderate

4.44

0.96

3106

4.50

0

-1.43%

no

4.13

0.37

0

8.71%

moderate

3.73

0.77

Conclusion: FPA008 was well tolerated up to 3 mg/kg in RA pts with no new safety signals.  Dose escalation is ongoing. Updated safety, PK/PD and preliminary efficacy from open-label dose escalation will be presented. 


Disclosure: L. Zhou, Five Prime Therapeutics, 5; R. Sikorski, Five Prime Therapeutics, 1,Five Prime Therapeutics, 3; S. Rogers, Five Prime Therapeutics, 1,Five Prime Therapeutics, 3; S. Costin, None; M. Korkosz, None; M. Jaraczewska-Baumann, None; P. Éva, None; B. Rojkovich, None; J. Bartalos, None; E. Masteller, Five Prime Therapeutics, 1,Five Prime Therapeutics, 3; H. Xiang, Five Prime Therapeutics, 1,Five Prime Therapeutics, 3; B. Wong, Five Prime Therapeutics, 1,Five Prime Therapeutics, 3; J. Hambleton, Five Prime Therapeutics, 1,Five Prime Therapeutics, 3.

To cite this abstract in AMA style:

Zhou L, Sikorski R, Rogers S, Costin S, Korkosz M, Jaraczewska-Baumann M, Éva P, Rojkovich B, Bartalos J, Masteller E, Xiang H, Wong B, Hambleton J. A Phase 1 Study of FPA008, an Anti-Colony Stimulating Factor 1 Receptor (anti-CSF1R) Antibody in Patients (pts) with Rheumatoid Arthritis (RA): Preliminary Results [abstract]. Arthritis Rheumatol. 2015; 67 (suppl 10). https://acrabstracts.org/abstract/a-phase-1-study-of-fpa008-an-anti-colony-stimulating-factor-1-receptor-anti-csf1r-antibody-in-patients-pts-with-rheumatoid-arthritis-ra-preliminary-results/. Accessed March 7, 2021.
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