Combination Bortezomib-containing Regimens in Newly Diagnosed Patients With t (4; 14) Positive Multiple Myeloma
Combination Bortezomib-containing Regimens in Newly Diagnosed Patients With t (4; 14) Positive Multiple Myeloma
Given the disappointing results with routine ASCT in t(4;14) patients, we propose this open
 label phase II study of bortezomib along with dexamethasone and pegylated liposomal
 doxorubicin (Doxil/Caelyx), referred to as the DBd regimen, for 4 cycles, followed by
 post-induction therapy with cyclophosphamide + bortezomib + prednisone (referred to as the
 CyBorP regimen) for 8 cycles. Since patients with t(4;14) remain at high risk for relapse,
 maintenance therapy with dexamethasone weekly will be given until disease progression.
PROTOCOL SYNOPSIS A. TITLE: An Open-Label Phase II Study of the Efficacy of Combination
 Bortezomib-containing Regimens in the Treatment of newly diagnosed patients with t (4;14)
 positive Multiple Myeloma.

 B. RATIONALE: Between 15 and 20% of myeloma patients exhibit a t(4;14), which results in
 translocation of the receptor tyrosine kinase (TK) fibroblast growth factor receptor 3
 (FGFR3) from chromosome 4 to the Immunoglobulin H (IgH) locus. The presence of a t(4;14)
 appears to confer an extremely poor prognosis. Patients with this abnormality do not
 experience prolonged remissions after a single autologous stem cell transplant (ASCT) using
 high-dose melphalan, and the optimal therapy of this group has not yet been defined.
 Specifically, data from Princess Margaret Hospital and the Mayo Clinic both indicate that the
 median progression-free survival (PFS) is only about 8 months and overall survival 18-22
 months after ASCT. Unpublished data from the French Francophone Myeloma Intergroup (IFM)
 studies suggest that tandem transplants may improve these results modestly, but the outcome
 is still inferior compared with other cytogenetic subgroups.

 Initial unpublished observations suggested that t(4;14) patients with relapsed/refractory
 disease were uniquely sensitive to the new agent bortezomib. More recent information in
 larger numbers of patients indicates that responses to single agent bortezomib are seen in up
 to 50-65% of t(4;14) patients; the duration of response is similar to that seen in other
 subsets, i.e. in the range of 5-7 months. Combinations of bortezomib with agents such as
 doxorubicin, pegylated liposomal doxorubicin, thalidomide, cyclophosphamide, melphalan,
 thalidomide and corticosteroids have been evaluated in a number of clinical studies in
 recurrent myeloma, and the response rates (RR) appear to be improved compared to single agent
 bortezomib, and toxicity has been acceptable.

 In newly diagnosed myeloma patients, combinations such as vincristine, doxorubicin,
 dexamethasone (VAD) and thalidomide + dexamethasone are often utilized before ASCT. A study
 by Hussein et al. substituted pegylated liposomal doxorubicin for the conventional
 formulation of doxorubicin and noted a similar response rate with less grade 3/4 neutropenia,
 alopecia and sepsis; in addition, patients do not necessarily require a central venous
 catheter. More recently, Cavenagh et al. has reported remarkable activity with the so-called
 PAD regimen of bortezomib, doxorubicin and dexamethasone, with a combined Complete Remission
 (CR) + Partial Response (PR) rate of 67% following 1 cycle, and 93% after 4 cycles, with no
 impairment of the ability to collect blood stem cells for ASCT. Preliminary data from an
 ongoing Canadian phase II study of Doxil/Caelyx + Bortezomib + Dexamethasone (DBd), in which
 pegylated liposomal doxorubin, bortezomib and dexamethasone are combined, has produced
 encouraging results to date with minimal toxicity. In that study, DBd therapy was given for 4
 cycles before ASCT independently of cytogenetic classification.

 Given the disappointing results with routine ASCT in t(4;14) patients, we propose this open
 label phase II study of bortezomib along with dexamethasone and pegylated liposomal
 doxorubicin (Doxil/Caelyx), referred to as the DBd regimen, for 4 cycles, followed by
 post-induction therapy with cyclophosphamide + bortezomib + prednisone (referred to as the
 CyBorP regimen) for 8 cycles. Since patients with t(4;14) remain at high risk for relapse,
 maintenance therapy with dexamethasone weekly will be given until disease progression. This
 approach will test the hypothesis that bortezomib-based therapy can improve the outcome of
 newly diagnosed t(4;14) multiple myeloma patients.

 C. OBJECTIVES OF THE STUDY: To evaluate the efficacy of the DBd regimen given as induction
 therapy, followed by post-induction therapy with CyBorP and maintenance therapy with
 dexamethasone in t(4;14) positive multiple myeloma (MM) patients.

 Primary Objectives

 -  To determine the time to progression (TTP) with this treatment regimen. Secondary
 Endpoints

 -  To determine the objective response rate following DBd induction therapy

 -  To determine the duration of response following DBd induction therapy

 -  To determine the objective response rate following CyBorP post-induction therapy

 -  To determine the duration of response following CyBorP post-induction therapy

 -  To determine PFS

 -  To determine overall survival

 -  To determine the safety profile of this regimen

 -  To examine the ability of bortezomib based regimens to repress FGFR3 signaling

 D. STUDY DESIGN: This is an open-label, Phase II study of induction therapy with bortezomib,
 pegylated liposomal doxorubicin (Doxil/Caelyx) and dexamethasone as initial therapy in
 patients with t(4;14). Each 21 day-cycle consists of bortezomib 1.3 mg/m2 (given as an I.V.
 bolus on Days 1, 4, 8, and 11) followed by a 10-day rest period (Days 12 to 21). DOXIL/CAELYX
 30 mg/m2 will be given after bortezomib as at least a 1-hour I.V. infusion on Day 4 of each
 21-day cycle. Dexamethasone 40 mg PO will be given on days 1-4, days 8-11 and days 15-18
 during the first cycle. For the subsequent 3 cycles, dexamethasone 40 mg PO will be given on
 days 1-4 and days 11-14. Patients who do not experience disease progression may undergo
 elective, as per the attending physician's discretion, stem cell mobilization followed by
 stem cell collection and cryopreservation. Patients will then receive post-induction therapy
 with cyclophosphamide + bortezomib + prednisone (1.5 mg/m2 bortezomib on days 1, 8, and 15
 I.V. + cyclophosphamide 300 mg/m2 PO weekly + prednisone 100 mg PO on alternate days) for 8
 monthly 28 day cycles, followed by maintenance therapy with 40 mg of dexamethasone weekly per
 month until disease progression occurs.

 E. PATIENT CHARACTERISTICS: Untreated multiple myeloma patients who are t(4;14) positive by
 fluorescence in situ hybridization (FISH) will be considered for the study. Exclusion
 criteria include inadequate liver function aspartate aminotransferase (AST} and alanine
 aminotransferase (ALT) > 2.5 times the upper limit of normal), thrombocytopenia (platelets <
 50 X 109/L), neutropenia (absolute neutrophil count < 1.0 x 109/L), pregnant or lactating
 women, and women of childbearing potential (WCBP) who are not using adequate contraception
 and Left Ventricular Ejection Fraction (LVEF) below the institutional Lower Limit Normal
 (LLN) or less than 40%; whichever value is higher. A patient may have received up to 4 months
 of other anti myeloma therapy, as part of the induction therapy, prior enrollment and still
 be considered eligible to participate in the study, as long as the patient's multiple myeloma
 has not progressed in the current regimen and the other eligibility criteria are met.

 F. STATISTICAL PLAN: The TTP from initiation of chemotherapy in patients treated with ASCT
 for this subset is approximately 12 months. An increase in TTP from 12 to 21 months would be
 of clinical significance. Using an 80% power to detect this time difference in a two-sided
 comparison patient, a sample size of 36 evaluable patients is required. This calculation
 assumes that each patient will be evaluated at a fixed time of 24 months. Assuming a 20%
 drop-out rate, a total sample size of 45 patients will be required.

 G. STUDY DESIGN: It is assumed that the new regimen will not be of further interest in
 t(4;14) positive myeloma patients if the TTP from the time of starting induction therapy is
 less than 21 months. Each patient will be followed every month until disease progression and
 then after every 6 moths up to 5 years for survival. An interim analysis will also be
 performed after 12 patients have completed the post-induction therapy with cyclophosphamide +
 bortezomib + prednisone (CyBorP).

 H. PATIENT ACCRUAL AND STUDY DURATION: Patients with t(4;14) represents only 15% of all
 myeloma patients, as such, accrual will be highly dependant on number of participating
 centers. It is estimated that approximately 350 newly-diagnosed patients will require
 cytogenetic screening in order to meet the accrual target. Accrual is expected to be complete
 within 48 months. Additional time is required, of course, to allow the response data to
 mature. All patients registered in the study will be accounted for (screen failures +
 enrolled patients). The number of patients who are not evaluable, who died or withdrew before
 treatment began will be specified. The distribution of follow-up times will be described and
 the number of patients lost to follow-up will be monitored.

 I. EFFICACY PARAMETERS: Beginning in cycle 1, the response to treatment will be determined
 during each cycle using the International Myeloma Working Group uniform response criteria for
 multiple myeloma as outlined in Section 11.0. Responses will be assessed by monoclonal
 protein, monoclonal paraprotein (M protein) quantification from serum and a 24-hour urine
 collection (including immunofixation, if needed), bone marrow plasma cells, assessment of
 lytic lesions, and soft tissue plasmacytomas. For patients with light chain disease or
 non-secretory myeloma, a serum sample for Free Lite chain testing will be obtained and the
 results will be compared to the levels reported quantified in the urine.

 J. REGISTRATION: Patients will be registered by completing the eligibility and enrollment
 checklist and forwarding it by fax to the Multiple Myeloma Research Coordinator at Princess
 Margaret Hospital at 416-946-4419, between the hours of 9 am and 4 pm Eastern Standard Time,
 up to 5 business days prior commencement of cycle 1 day 1. The research coordinator should
 also be contacted by phone at 416 946-4627. The checklist will be verified and a patient
 number will be assigned for eligible patients.

 K. SAMPLE PROCESSING: Centralized screening will be employed at Princess Margaret Hospital.
 Following informed consent site should send two fresh heparinized (green top tube) marrow
 samples (5cc per tube or best available) by overnight courier (see Appendix VI for shipping
 and notification instructions) for t4;14 screening test. Tri-color fluorescence in situ
 hybridization (FISH) for t(4;14) will be performed and reported back to referring site within
 5-7 working days.
Inclusion Criteria:

 -  Patients previously diagnosed with MM based on criteria from the International Myeloma
 Working Group (IMWG)

 -  Patients who have 'measurable' disease

 -  Age 18 years at the time of signing Informed Consent

 -  A patient may have received up to 4 months of other anti myeloma therapy, as part of
 the induction therapy, prior enrollment and still be considered eligible to
 participate in the study, as long as the patient's multiple myeloma has not progressed
 on the current regimen and the other eligibility criteria are met.

 -  Patient is t(4;14) positive on screening assay.

 Exclusion Criteria:

 -  Concomitant therapy medications that include corticosteroids (> 10 mg per day of
 prednisone or equivalent) or other therapy that is or may be active against myeloma
 prior to day 1 (with the exception of radiation therapy or induction therapy as
 described under the above inclusion criteria section

 -  Peripheral neuropathy of Grade 2 or greater.

 -  Patients with evidence of mucosal or internal bleeding and/or refractoriness to
 platelet transfusions (i.e., unable to maintain a platelet count 50 x 109 /L).

 -  Patients with an absolute neutrophil count (ANC) < 1.0 x 109/L. Treatment to raise the
 ANC, such as granulocyte colony-stimulating factor (G-CSF) or granulocyte-macrophage
 colony-stimulating factor (GM-CSF) is not allowed within 14 days of study entry.

 -  Patients with hemoglobin < 80 g/L despite transfusion.

 -  Pregnant or lactating women