Stem Cell Transplant Therapy With Campath-1H for Treating Advanced Mycosis Fungoides and Sezary Syndrome

Primary cutaneous T-cell lymphomas (CTCL) are a group of lymphoproliferative disorders characterized by localization of neoplastic T cells to the skin at presentation. Mycosis fungoides (MF) and its leukemic variant Sezary syndrome (SS) are the most prevalent forms of CTCL. While early stage MF is restricted to patches and plaques involving the skin, most patients eventually develop cutaneous tumors, generalized erythroderma, or dissemination to peripheral blood, lymph nodes or visceral organs. Currently existing therapy of tumor-stage and disseminated CTCL is palliative, with most patients dying within 1-5 years. The presence of CD8+ cells in close proximity to dermal neoplastic infiltrates in early stages of the disease, and the clinical response seen with some immunomodulatory agents suggests that CTCL may be potential targets for immunotherapy-based interventions.

Allogeneic stem cell transplantation is a curative treatment modality successfully employed in a number of hematologic malignancies. The curative effect of this approach is in part mediated by donor-derived T lymphocytes with reactivity for patient leukemic cells. The power of this graft versus leukemia effect (GVL) is best illustrated in patients with relapsed Chronic Myeloid Leukemia (CML) after an allogeneic bone marrow transplant, in whom a single donor lymphocyte infusion (DLI) can induce remission. We hypothesize that neoplastic T cells in MF/SS may similarly be susceptible to a graft vs. tumor (GVT) effect. Unfortunately, advanced patient age and a 25% to 35% risk of transplant related mortality (TRM) preclude the use of conventional 'dose- intensive' allogeneic peripheral blood stem cell transplantation (PBSCT) in patients with advanced CTCL who might otherwise benefit from this approach. The risk of TRM related to conditioning can be circumvented at least partially by using a reduced-intensity conditioning regimen to prepare the patient for transplantation.

In this study, we will treat male and non-pregnant female subjects between the ages of 18 and 70 years (both inclusive) suffering from advanced MF/SS with an allogeneic peripheral blood stem cell (PBSC) transplant from an HLA-matched family donor or an HLA matched (10/10 allele level match) unrelated donor. A low intensity, nonmyeloablative conditioning regimen employing the anti-CD52 monoclonal antibody Campath-1H (alemtuzumab) and fludarabine will be used to induce host immunosuppression to facilitate donor hematopoietic and lymphoid engraftment. We anticipate minimal host myelosuppression and consequently reduced early transplant toxicity with this conditioning regimen. Immune and hematopoietic reconstitution will be achieved by infusion of unmanipulated donor-derived granulocyte colony stimulation factor (G-CSF) mobilized peripheral blood stem cells. Infusion of donor lymphocytes in incremental doses will be used to promote engraftment or disease regression when indicated. Cyclosporine A (CSA) will be used as prophylaxis against graft vs host disease (GVHD), with dose adjustments made as necessary to favor complete donor chimerism and disease regression.

A total of up to 25 subjects (transplant recipients) will be treated on this protocol. The primary end point of this study is efficacy (proportion of subjects achieving a complete response). Other end points include assessment of donor-host chimerism in various hematopoietic and lymphoid cells, overall response, incidence of acute and chronic GVHD, graft failure, assessment of lymphoid subset reconstitution, transplant related morbidity and mortality and disease-free and overall survival and the outcomes of transplantation by the donor type (related vs. unrelated).

• INCLUSION CRITERIA-RECIPIENT:

Ages 18-70 years (both inclusive)

Stages IIb to IVb patients with MF (biopsy diagnostic or consistent with MF) who have progressed despite at least one treatment regimen and all patients with SS

AND

Anticipated median survival less than 5 years or debilitation as a result of their disease.

Recovery from acute toxicity of prior treatment for MF/SS (to less than or equal to grade 1 [CTCAE v3.0]) or stabilization of toxicity occurring from prior therapy for MF/SS.

HIV negative

ECOG performance status of 1 or less.

No major organ dysfunction precluding transplantation.

DLCO greater than or equal to 60 percent predicted

Left ventricular ejection fraction greater than or equal to 40 percent.

Less than or equal to 25 percent of liver involved with metastatic tumor by CT scan.

6/6 HLA matched family donor or 10/10 matched unrelated donor at the allelic level available

Ability to comprehend the investigational nature of the study and provide informed consent.

Inclusion criteria

-RELATED and UNRELATED DONOR:<TAB>

6/6 HLA- matched family donor or 10/10 HLA-matched unrelated donor

Age greater than or equal to 18 years

Ability to comprehend the investigational nature of the study and provide informed consent.

For unrelated donor, the NMDP unrelated donor inclusion criteria will be used as outlined in document (http://bethematch.org/WorkArea/DownloadAsset.aspx?id=1960).

Donor eligibility will be completed per NMDP standards and in accordance with most recent and stringent FDA guidelines.

Exclusion criteria

(ANY OF THE FOLLOWING)-RECIPIENT

Patient pregnant or lactating

Age greater than 70 or less than 18 years

ECOG performance status of 2 or more.

Psychiatric disorder or mental deficiency of the recipient or donor sufficiently severe as to make compliance with the BMT treatment unlikely and making informed consent impossible.

Major anticipated illness or organ failure incompatible with survival from BMT and where survival is considered insufficient to assess transplant outcome (i.e. less than 3 months).

DLCO less than 60 percent predicted

Left ventricular ejection fraction less than 40 percent

Serum creatinine greater than 2.0 mg/dl

Serum bilirubin greater than 4 mg/dl, transaminases greater than 5 times the upper limit of normal

HIV positive

History of other malignancies in the last five years with the exception of basal cell or squamous cell carcinoma of the skin

Evidence for CNS metastatic disease

Disease involving greater than 25 percent of the liver radiographically.

Exclusion criteria

(any of the following)-RELATED AND UNRELATED DONOR:

Donor pregnant or lactating

Age less than 18 years

HIV positive (donors who are positive for hepatitis B (HBV), hepatitis C (HCV) or human T-cell lymphotropic virus (HTLV-1) will be used at the discretion of the investigator following counseling and approval from the recipient).

Sickling hemoglobinopathy including HbSS or HbsC (for unrelated donors, testing for hemoglobinopathies will only be done when clinically indicated).

History of malignancy within 5 years except basal cell or squamous carcinoma of the skin.

Donor unfit to receive G-CSF and undergo apheresis (Uncontrolled hypertension, history of stroke, thrombocytopenia).

Psychiatric disorder or mental deficiency of the donor sufficiently severe as to make compliance with the BMT treatment unlikely and making informed consent impossible.