A Neoadjuvant Study of Androgen Ablation Combined With Cyclophosphamide and GVAX Vaccine for Localized Prostate Cancer

A Neoadjuvant Study of Androgen Ablation Combined With Cyclophosphamide and GVAX Vaccine for Localized Prostate Cancer

A Neoadjuvant Immunologic Study of Androgen Deprivation Therapy Combined With a Granulocytemacrophage-colony Stimulating Factor F-secreting Allogeneic Prostate Cancer Vaccine and Low-dose Cyclophosphamide in Men With High-risk Localized Prostate Cancer Undergoing Radical Prostatectomy

This research is being done to see if an investigational prostate cancer vaccine, called GVAX, can safely be given together with a single intravenous injection of a drug called cyclophosphamide to men that will undergo surgery to remove their cancerous prostate glands who have also received standard hormonal therapy.

Cancer immunotherapy refers broadly to approaches which attempt to treat cancer by activating immune responses directed against malignant tissue. Prostate GVAX is an allogeneic cell-based prostate cancer vaccine composed of two irradiated cell lines (PC3 and LNCaP) that have been genetically modified to secrete granulocyte-macrophage colony-stimulating factor (granulocytemacrophage-colony stimulating factor). The release of granulocytemacrophage-colony stimulating factor by these modified tumor cells serves to recruit dendritic cells which then present tumor antigens to T-cells, thus initiating antitumor immune responses. However, abundant preclinical data show that, when used alone, cell-based immunotherapy is unable to break specific T-cell tolerance in tumor-bearing hosts. Studies in an autochthonous prostate cancer mouse model have shown that giving low-dose cyclophosphamide prior to a cell-based granulocytemacrophage-colony stimulating factor-secreting vaccine abrogates immune tolerance through augmentation of CD8+ T cell infiltration in the prostate, transient depletion of regulatory T cells (Tregs), and increased expression of dendritic cell maturation markers. Enhancement of antitumor immunity has also been observed in other preclinical models where cyclophosphamide was given in sequence with granulocytemacrophage-colony stimulating factor-secreting immunotherapy for the treatment of breast and pancreatic cancers. These preclinical data are supported by early-phase clinical trials combining GVAX with low-dose cyclophosphamide in pancreatic and breast cancers. Furthermore, emerging evidence suggests that androgen deprivation therapy (ADT) itself has profound effects on the host immune system, resulting in thymic regeneration and enhancement of antitumor immunity. In addition, preclinical and clinical studies demonstrate that ADT augments prostate cancer-specific immune responses induced by immunotherapy, suggesting that ADT may act synergistically with immunotherapy. Based on data from mouse models as well as human clinical trials, it has been suggested that prostate cancer immunotherapy may be most effective when administered in the setting of an androgen-suppressed environment. Building on these findings, investigators have designed a study to assess the use of ADT given alone or administered following immunization with low-dose cyclophosphamide and prostate GVAX, in patients undergoing radical prostatectomy. Investigators aim (1) to determine whether ADT is immunogenic in men with localized prostate cancer by evaluating T-cell infiltration in harvested prostate glands; (2) to determine whether administering ADT after low-dose cyclophosphamide and prostate GVAX augments immune infiltration into the prostate gland; and (3) to investigate whether this combinatorial immuno-hormonal approach is safe and feasible. Investigators hypothesize that the combination of ADT and cyclophosphamide/GVAX will produce significantly greater antitumor immune responses than would ADT used alone.

Degarelix will be administered as three 80 mg subcutaneous injections, for a total dose of 240 mg at 14 (±3) days prior to surgery. A telephone follow-up interview (or an in-person clinic visit) to evaluate for adverse events will occur 28 (±21) days after prostatectomy. Patients will then be followed by their urologists according to standard institutional practices, but will require prostate-specific antigen evaluations every 3 (±1) months during year 1 and every 6 (±2) months during years 2-3.

Cyclophosphamide will be given at a dose of 200 mg/m2 as a single intravenous infusion. 1 day later, prostate GVAX will be administered as five 0.8-mL intradermal injections of PC3 (2.5 × 108 cells) and five 0.5-mL intradermal injections of LNCaP (2.5 × 108 cells), for a total dose of 5 × 108 cells. On day 14, Degarelix will be administered as three 80 mg subcutaneous injections, for a total dose of 240 mg.

Degarelix Acetate is a gonadotropin-releasing hormone (GnRH) receptor antagonist. It works by decreasing the amount of testosterone in the body,which the tumor needs to grow.

Cyclophosphamide as a potent enhancer of immune responses to GVAX. cyclophosphamide is used as an immune suppressor in many autoimmune disorders.

GVAX is granulocytemacrophage -colony stimulating factor -secreting allogeneic cell-based vaccine as immunotherapy for prostate cancer

CD8+ T cell infiltration (quantified as log[CD8 density]) into the prostate from harvested prostate glands in men with localized prostate cancer receiving neoadjuvant Androgen deprivation therapy alone (2 weeks prior to surgery), or cyclophosphamide and GVAX followed by Androgen deprivation therapy, (with cyclophosphamide/GVAX administered 4 weeks prior to prostatectomy, and Androgen deprivation therapy administered 2 weeks prior to prostatectomy).

Tissue androgen concentrations (testosterone, dihydrotestosterone), and androgen receptor (AR) protein expression in prostate specimens

Number of participants with generation of novel antibodies to prostate-associated antigens in the serum of patients, after the initiation of protocol therapy

Percentage of participants in each arm who were free of prostate specific antigen recurrence (i.e. prostate specific antigen remained undetectable after prostatectomy) at 24 months after undergoing surgery.

Inclusion Criteria: Histologically confirmed adenocarcinoma of the prostate (clinical stage T1c-T3b, N0, M0) without involvement of lymph nodes, bone, or visceral organs Initial prostate biopsy is available for central pathologic review, and is confirmed to show at least 2 positive cores and a maximum Gleason sum of ≥ 7 Radical prostatectomy has been scheduled at Johns Hopkins Hospital Age ≥ 21 years Eastern Cooperative Oncology Group performance status 0-1, or Karnofsky score ≥ 70% Adequate bone marrow, hepatic, and renal function: White Blood Count > 3,000 cells/mm3 Absolute neutrophil count > 1,500 cells/mm3 Hemoglobin > 9.0 g/dL Platelet count > 100,000 cells/mm3 Serum creatinine < 2.0 mg/dL Serum bilirubin < 2 mg/dL Alanine aminotransferase < 2 × upper limit of normal (ULN) Aspartate aminotransferase < 2 × ULN Alkaline phosphatase < 2 × ULN Willingness to provide written informed consent and HIPAA authorization for the release of personal health information, and the ability to comply with the study requirements (note: HIPAA authorization will be included in the informed consent) Willingness to use barrier contraception from the time of cyclophosphamide and/or GVAX administration until the time of prostatectomy. Exclusion Criteria: Presence of known lymph node involvement or distant metastases Other histologic types of prostate cancers such as ductal, sarcomatous, lymphoma, small cell, and neuroendocrine tumors Prior radiation therapy, hormonal therapy, biologic therapy, or chemotherapy for prostate cancer Prior immunotherapy/vaccine therapy for prostate cancer Previous or concurrent use of cyclophosphamide Concomitant treatment with other hormonal therapy or 5a-reductase inhibitors Current use of systemic corticosteroids or use of corticosteroids within 4 weeks of enrollment (inhaled corticosteroids for asthma or Chronic obstructive pulmonary disease are permitted) Use of experimental agents for prostate cancer within the past 3 months Known allergy to cyclophosphamide or G-colony stimulating factor /granulocytemacrophage-colony stimulating factor Known hypersensitivity to materials of bovine origin (e.g. fetal bovine serum), or other components of GVAX which include Dimethyl sulfoxide and hydroxyethyl starch as well as small amounts of porcine trypsin and DNase History or presence of autoimmune disease requiring systemic immunosuppression (including but not limited to: inflammatory bowel disease, systemic lupus erythematosus, vasculitis, rheumatoid arthritis, scleroderma, multiple sclerosis, hemolytic anemia, Sjögren syndrome, and sarcoidosis) Other concurrent malignancies, with the exception of non-melanoma skin cancers and superficial bladder cancer Uncontrolled major active infectious, cardiovascular, pulmonary, hematologic, or psychiatric illnesses that would make the patient a poor study candidate Known prior or current history of HIV and/or hepatitis B/C