Carfilzomib:  days
Plans to receive maintenance treatment within  days post-engraftment (e.g. Lenalidomide, Bortezomib, Pomalidomide, Thalidomide, Carfilzomib, etc.)
Proteasome inhibitor therapy (e.g. bortezomib or carfilzomib) - weeks
Patients not able to tolerate lenalidomide or carfilzomib or dexamethasone
ARM : Must have prior exposure to an immunomodulatory drug (IMiD) and proteasome inhibitor (PI) and have had  prior regimens/lines of therapy; but there is no maximum number of prior regimens, and prior autologous bone marrow transplant is acceptable if >  weeks from transplantation; patients may have received prior carfilzomib (sensitive, relapsed and refractory [having progressed while receiving carfilzomib or within  days of stopping carfilzomib] are all eligible), but must be >  weeks from last dosing of carfilzomib
ARM : Must have had at least  but no more than  prior lines of anti-myeloma therapy; may be refractory to lenalidomide but sensitive to carfilzomib; prior exposure to carfilzomib is allowed but may not be refractory to carfilzomib; subjects must be >=  weeks from last carfilzomib therapy
Patients may have received prior carfilzomib (sensitive, relapsed and refractory all eligible);  response and duration of prior carfilzomib therapy must be known
Male subjects must agree to practice contraception for at least  days after the last dose of carfilzomib, and must agree not to donate sperm for at least  days after the last dose of carfilzomib
Prior treatment with carfilzomib for lymphoma
Male subjects must agree not to donate semen or sperm while taking pomalidomide and/or carfilzomib until at least  days after the last pomalidomide/carfilzomib dose
Known allergies to carfilzomib or Captisol
Pts who have received prior treatment with carfilzomib (Phase II only)
Pts who have received prior treatment with both carfilzomib & pomalidomide (Phase I only)
For patients that relapse following a response to prior treatment with bortezomib or carfilzomib, six months must have elapsed since the last dose of treatment
The patient is refractory to carfilzomib or bortezomib; (refractory is defined as patients who never achieved a response and progressed while on carfilzomib or bortezomib or within  days of completing treatment)
Patients must have been previously treated with an immunomodulatory drug (IMiD) and proteasome inhibitor, must be refractory to carfilzomib defined as progression on or within  months of a carfilzomib-containing therapy, and must be progressing
Patients eligible for this trial will be those who have failed carfilzomib either as a single agent as the last form of therapy, or carfilzomib in combination with dexamethasone, or carfilzomib in combination with revlimid and dexamethasone; given the potential for compounding/worsening toxicities with the addition of cabozantinib to carfilzomib, patients eligible for the trial will have to have had very good tolerance to carfilzomib in the context of described regimens, with resolved prior toxicity to grade  or better, and no toxicities due to carfilzomib that required dose reductions to less than  mg/m^
Allergy to carfilzomib or cabozantinib or any excipients
Subjects who have carfilzomib-related posterior reversible encephalopathy syndrome (PRES) and thrombotic microangiopathy (TMA) should not be challenged with carfilzomib
Must have received at least  consecutive cycles of a bortezomib- or carfilzomib-containing regimen, and either:
Achieved at least a partial response (PR) and did not have PD during treatment with or within  days after the last dose of bortezomib or carfilzomib, OR
Had bortezomib and/or carfilzomib intolerance (defined as discontinuation because of drug-related adverse events (AEs) before completion of the planned treatment course) without PD before the start of the next regimen.
Subjects not able to tolerate elotuzumab, lenalidomide, carfilzomib, or dexamethasone
Prior treatment with carfilzomib
Patients must be at least  weeks from last treatment with a proteasome inhibitor (e.g., bortezomib, carfilzomib) at time of treatment on this protocol
No prior irinotecan or carfilzomib
Are refractory to bortezomib or carfilzomib at the last exposure before this study (defined as participants having PD while receiving bortezomib or carfilzomib therapy or within  days after ending bortezomib or carfilzomib therapy).
Criteria  Prior therapy with carfilzomib is allowed as long as the patient had at least a PR to most recent therapy with carfilzomib, was not removed due to toxicity, did not relapse within  days from discontinuation of carfilzomib, and will have at least a -month carfilzomib treatment-free interval from last dose received until first study treatment. (Patients may receive maintenance therapy with drugs that are not proteasome inhibitors or CD antibodies during this -month carfilzomib treatment free interval)
Subjects must have been treated with at least  prior therapies including a proteasome inhibitor and a cereblon-binding agent\r\n* Subjects who are refractory to carfilzomib may enroll throughout the trial; carfilzomib refractory status is defined by IMWG criteria: disease that is nonresponsive while on salvage therapy, or progresses within  days of last therapy in patients who have achieved minimal response (MR) or better at some point previously before then progressing in their disease course\r\n* In the twice weekly dosing cohort of the study, enrollment will be limited to patients meeting carfilzomib refractory status\r\n* In the weekly dosing cohort, it will be required that one of the expansion cohorts ( subjects) enrolls carfilzomib refractory subjects and the other ( subjects) enrolls carfilzomib/proteasome inhibitor (PI) naive/sensitive subjects
Male patients must agree not to donate semen or sperm while they are taking carfilzomib and  days after the last carfilzomib dose.
Patients may not have received any prior carfilzomib treatment
Patient must have been eligible for and initially randomized to Arm  (low dose carfilzomib), begun cycle  of treatment, and progressed prior to completing  cycles of protocol therapy
For carfilzomib-lenalidomide-dexamethasone (KRd) regimen: newly diagnosed myeloma. For carfilzomib-dexamethasone (CFZ-dex) regimen: relapsed or refractory disease
Subjects with relapsed/refractory MM who have received at least two prior lines of therapy including lenalidomide and either bortezomib or carfilzomib and have demonstrated disease progression on or within  days of the completion of the most recent treatment regimen.
Patients must have failed treatment with lenalidomide and a proteasome inhibitor (bortezomib, carfilzomib, or ixazomib) alone or in combination.
Any prior treatment with carfilzomib
Prior treatment with carfilzomib or oprozomib
Is refractory to VELCADE or another PI, like ixazomib and carfilzomib (had progression of disease while receiving VELCADE therapy or within  days of ending VELCADE therapy or another PI therapy, like ixazomib and carfilzomib
Prior treatment with either carfilzomib or oprozomib
Prior therapy with carfilzomib if discontinued due to toxicity
Intolerance to previous bendamustine, carfilzomib or dexamethasone or mannitol; subjects who are allergic to bortezomib are not excluded
Prior dose limiting toxicity from carfilzomib or lenalidomide
Prior carfizolmib is not required but is allowed if a patient had at least  cycles of carfilzomib alone or in combination with a dose of at least / mg/m, as long as the patient :
Had at least a partial response to prior carfilzomib therapy
Was not removed from carfilzomib therapy due to toxicity, unless approved by the medical monitor
Male subjects must agree not to donate semen or sperm while taking lenalidomide and/or carfilzomib and  days after the last lenalidomide/carfilzomib dose
Patients should be proteasome inhibitor naive (including bortezomib and carfilzomib) OR have received less than  cycles of therapy with a bortezomib or carfilzomib containing regimen and were not refractory to the bortezomib or carfilzomib based regimen (less than a PR or progression on or within  days of discontinuation)
Prior therapy with any proteasome inhibitor other than bortezomib or carfilzomib
Confirmed relapsed or refractory multiple myeloma (MM) or plasma cell leukemia (PCL); patients should have received at least  prior treatment regimen; prior treatment must have included at least one full cycle of a proteasome inhibitor (e.g., bortezomib) and at least one full cycle of an immunomodulatory (IMiD) (e.g., thalidomide, lenalidomide or pomalidomide); patients who have had prior ARRY- and carfilzomib will be allowed in the dose escalation phase, however prior ARRY- and carfilzomib will be excluded in the dose expansion cohort  of part A; there will be  cohorts in the dose expansion of part A: cohort  will be patients who are carfilzomib sensitive; cohort  will be patients who are carfilzomib refractory
Patients who have received any previous carfilzomib treatment
Prior treatment with carfilzomib, filanesib, or any other KSP inhibitor.
Known hypersensitivity to carfilzomib
Subjects must have progressed on standard dose/schedule of carfilzomib without having had any carfilzomib related grade  or  toxicities
Prior therapy with carfilzomib is allowed as long as the patient had at least a PR to prior carfilzomib therapy, was not removed from carfilzomib therapy due to toxicity, and had at least a -month carfilzomib treatment-free interval from last dose received until first study treatment. (Patients may receive maintenance therapy with drugs that are not in the proteasome inhibitor class during this  month carfilzomib treatment-free interval). The exception to this is patients randomized or previously randomized in any other Onyx-Sponsored Phase  trial.
c. carfilzomib. Demonstrated disease progression on or within d of completion of carfilzomib therapy
Prior carfilzomib treatment
Not received carfilzomib within  months ( days) of Cycle  Day  (CD), and
Did not discontinue carfilzomib treatment because of adverse effects.
For Concomitant Treatment: No prior treatment with MRZ or any other PIs, including BTZ, carfilzomib (CFZ), or ixazomib (IXZ)