Sipuleucel-T

Sipuleucel-T
Vaccine description
Target disease Prostate cancer
Type Protein subunit
Clinical data
Trade names Provenge
AHFS/Drugs.com FDA Professional Drug Information
MedlinePlus a611025
Pregnancy
category
  • N/A (only approved in men)
Legal status
Routes of
administration		 Intravenous
Identifiers
CAS Number 917381-47-6 YesY
ATC code L03AX17
PubChem SID 85151648
ChemSpider none
UNII 8Q622VDR18 N
KEGG D06644 YesY
ChEMBL CHEMBL1237024 N
 NYesY (what is this?)  (verify)

Sipuleucel-T (APC8015, trade name Provenge),[1][2] manufactured by Dendreon Corporation, is a cell-based cancer immunotherapy for prostate cancer (CaP). It is a personalized treatment that works by programming a patient's own immune system to seek out cancer spreading in the body, and attack it as if it were foreign. It must be prepared specifically for each patient.

While referred to as a therapeutic vaccine that treats the cancer, as compared to a preventive vaccine, which prevents infectious disease, sipuleucel-T is an immunostimulant.

In metastatic prostate cancer, it has extended survival by median 4.1 months (IMPACT Phase III trial data).[3] Improvements in 3-year survival rates have also been shown, with 31.7% of treated patients surviving for 36 months vs. 23.0% in the control arm.[4] The treatment cost $93,000 at FDA approval, but rose to over $100,000 in 2014.[5]

On February 20, 2015, Valeant Pharmaceuticals received approval to purchase all Dendreon assets (including Provenge).

Treatment method

A course of sipuleucel-T treatment consists of three basic steps:

  1. A patient's own white blood cells, primarily dendritic cells, a type of antigen-presenting cells (APCs), are extracted in a leukapheresis procedure.
  2. The blood product is sent to a production facility and incubated with a fusion protein (PA2024) consisting of two parts,
    1. the antigen prostatic acid phosphatase (PAP), which is present in 95% of prostate cancer cells, and
    2. an immune signaling factor granulocyte-macrophage colony stimulating factor (GM-CSF) that helps the APCs to mature.
  3. The activated blood product (APC8015) is returned from the production facility to the infusion center and re-infused into the patient to cause an immune response against cancer cells carrying the PAP antigen.[6][7]

A complete sipuleucel-T treatment repeats three courses, with two weeks between successive courses.[8]

Use

Sipuleucel-T is used to treat people with metastatic, asymptomatic, hormone-refractory prostate cancer (HRPC). Other names for this stage are metastatic castrate-resistant (mCRPC) and androgen independent (AI) or (AIPC). This stage leads to mCRPC with lymph node involvement and distal (distant) tumors; this is the lethal stage of CaP. The prostate cancer staging designation is T4,N1,M1c.[6][7][9]

Clinical trials that have reported

Sipuleucel-T showed overall survival (OS) benefit to patients in three double-blind randomized phase III clinical trials, D9901,[7] D9902a,[10][11] and IMPACT.[6]

The IMPACT trial[6] served as the basis for licensing approval of sipuleucel-T by the FDA. This trial enrolled 512 patients with asymptomatic or minimally symptomatic metastatic HRPC randomized in a 2:1 ratio. The median survival time for sipuleucel-T patients was 25.8 months comparing to 21.7 months for placebo-treated patients. Overall survival was statistically significant (P=0.032). However, a better control group would have included patients receiving white blood cells incubated with GM-CSF alone, so that the main difference between the two groups would have been the tumor antigen. Furthermore, the longer survival without tumor shrinkage or change in progression is surprising. This may suggest the effect of an unmeasured variable.[9] Nevertheless, the IMPACT trial was conducted pursuant to a FDA Special Protocol Assessment (SPA), a set of guidelines binding trial investigators to specific agreed-upon parameters with respect to trial design, procedures, and endpoints measured; trial regulatory value as the basis for FDA approval as well as overall scientific integrity were thus prioritized and ensured via such compliance.

The D9901 trial[7] enrolled 127 patients with asymptomatic metastatic HRPC randomized in a 2:1 ratio. The median survival time for patients treated with sipuleucel-T was 25.9 months comparing to 21.4 months for placebo-treated patients. Overall survival was statistically significant ([[P-value | P=0.01]]).

The D9902a trial[10] was designed like the D9901 trial but enrolled 98 patients. The median survival time for patients treated with sipuleucel-T was 19.0 months comparing to 15.3 months for placebo-treated patients, but did not reach statistical significance.

Side effects

The most common side effects include: bladder pain; bloating or swelling of the face, arms, hands, lower legs, or feet; bloody or cloudy urine; body aches or pain; chest pain; chills; confusion; cough; diarrhea; difficult, burning, or painful urination; difficulty with breathing; difficulty with speaking up to inability to speak; double vision; sleeplessnes; and inability to move the arms, legs, or facial muscles.[12][13]

Regulatory approval and reimbursement

Sipuleucel-T was approved by the U.S. Food and Drug Administration (FDA) on April 29, 2010, to treat asymptomatic or minimally symptomatic metastatic HRPC.[14][15]

Shortly afterward, sipuleucel-T was added to the compendium of cancer treatments published by the National Comprehensive Cancer Network (NCCN) as a "category 1" (highest recommendation) treatment for HRPC. The NCCN Compendium is used by Medicare and major health care insurance providers to decide whether a treatment should be reimbursed.[16][17]

Clinical trials on going

As of August 2014, the PRO Treatment and Early Cancer Treatment (PROTECT) trial, a phase IIIB clinical trial started in 2001, was tracking subjects but no longer enrolling new subjects.[18] Its purpose is to test efficacy for patients whose CaP is still controlled by either suppression of testosterone by hormone treatment or by surgical castration. Such patients have usually failed primary treatment of either surgical removal of the prostate, (EBRT), internal radiation, BNCT or (HIFU) for curative intent. Such failure is called biochemical failure and is defined as a PSA reading of 2.0 ng/mL above nadir (the lowest reading taken post primary treatment).[19]

As of August 2014, a clinical trial administering sipuleucel-T in conjunction with ipilimumab (Yervoy) was tracking subjects but no longer enrolling new subjects; the trial evaluates the clinical safety and anti-cancer effects (quantified in PSA, radiographic, and T cell response) of the combination therapy in patients with advanced prostate cancer.[20]

References

  1. ↑ Plosker GL (January 2011). "Sipuleucel-T: in metastatic castration-resistant prostate cancer". Drugs 71 (1): 101–8. doi:10.2165/11206840-000000000-00000. PMID 21175243.
  2. ↑ Immunostimulatory composition
  3. ↑ Lacroix, Marc (2014). Targeted Therapies in Cancer. Hauppauge , NY: Nova Sciences Publishers. ISBN 978-1-63321-687-7.
  4. ↑ Kantoff, Philip (July 29, 2010). "Sipuleucel-T Immunotherapy for Castration-Resistant Prostate Cancer". The New England Journal of Medicine 363 (5): 411–22. doi:10.1056/NEJMoa1001294. PMID 20818862.
  5. ↑ Exclusive: Questionable data propped up cancer drug Provenge, By Sharon Begley, Reuters, Oct 11, 2012
  6. 1 2 3 4 Kantoff PW; Higano CS; Shore ND; Berger ER; Small EJ; Penson DF; Redfern CH; Ferrari AC; Dreicer R; Sims RB; Xu Y; Frohlich MW; Schellhammer PF (July 2010). "Sipuleucel-T immunotherapy for castration-resistant prostate cancer" (PDF). N. Engl. J. Med. 363 (5): 411–22. doi:10.1056/NEJMoa1001294. PMID 20818862.
  7. 1 2 3 4 Small EJ, Schellhammer PF, Higano CS, Redfern CH, Nemunaitis JJ, Valone FH, Verjee SS, Jones LA, Hershberg RM (July 2006). "Placebo-controlled phase III trial of immunologic therapy with sipuleucel-T (APC8015) in patients with metastatic, asymptomatic hormone refractory prostate cancer" (PDF). J. Clin. Oncol. 24 (19): 3089–94. doi:10.1200/JCO.2005.04.5252. PMID 16809734.
  8. ↑ "Sipuleucel-T: APC 8015, APC-8015, prostate cancer vaccine - Dendreon". Drugs R D 7 (3): 197–201. 2006. doi:10.2165/00126839-200607030-00006. PMID 16752945.
  9. 1 2 Longo DL (July 2010). "New therapies for castration-resistant prostate cancer". N. Engl. J. Med. 363 (5): 479–81. doi:10.1056/NEJMe1006300. PMID 20818868.
  10. 1 2 Higano C, Burch P, Small E, Schellhammer P, Lemon R, Verjee S, Hershberg R (October 2005). Immunotherapy (APC8015) for androgen independent prostate cancer (AIPC): final progression and survival data from a second Phase 3 trial. 13th European Cancer Conference. Paris.
  11. ↑ Mason K (2005-11-02). "New treatment options for patients with prostate cancer". ECCO-the European CanCer Organisation.
  12. ↑ "Sipuleucel-T (Intravenous Route) - Side Effects". Mayo Clinic. Retrieved 22 April 2015.
  13. ↑ "Package Insert and Patient Information - Provenge (PDF - 157KB)" (PDF). U.S. Food and Drug Administration (FDA). Retrieved 22 April 2015.
  14. ↑ Richwine L (2010-04-29). "U.S. FDA OKs Dendreon's prostate cancer vaccine". Reuters. Retrieved 2010-04-30.
  15. ↑ "Approval Letter - Provenge". Food and Drug Administration. 2010-04-29.
  16. ↑ "NCCN Guidelines and NCCN Compendium Updated". Retrieved 2011-01-08.
  17. ↑ "NCCN Drugs & Biologics Compendium".
  18. ↑ "NCT00779402: Provenge for the Treatment of Hormone Sensitive Prostate Cancer". ClinicalTrials.gov. US National Institutes of Health.
  19. ↑ Roach M; Hanks G; Thames H; Schellhammer P; Shipley WU; Sokol GH; Sandler H (July 2006). "Defining biochemical failure following radiotherapy with or without hormonal therapy in men with clinically localized prostate cancer: recommendations of the RTOG-ASTRO Phoenix Consensus Conference". Int. J. Radiat. Oncol. Biol. Phys. 65 (4): 965–74. doi:10.1016/j.ijrobp.2006.04.029. PMID 16798415.
  20. ↑ "Sipuleucel-T and ipilimumab clinical trials". ClinicalTrials.gov. US National Institutes of Health.

External links

 This article incorporates public domain material from the U.S. National Cancer Institute document "Dictionary of Cancer Terms".

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