multiple myeloma Flashcards
RVD is…
Rvd = lenalidomide (Revlimid), Bortezomib (Velcade) and dexamethasone (VRd) (1 g q month).
newly approved agents for MM
monoclonal antibodies
CAR T-cell
ADC’s
BiTES
bortezomib MOA
proteasome inhibitor, protein production halts, leading to apoptosis
prognosis in general/progress in treatment
people are living longer but they are still dying (MM can’t be cured yet)
IMiDs means
immunomodulatory drugs
new monoclonal antibody added to RvD
darzalex
primary problems with CAR T cell therapy
cost + *access (not available most places)
sequential vs combined therapy in MM
combined therapy better (multiple populations of cells), so 3 drug regimens are standard of care (triplet therapy)
response assessment
M-protein level + BMB
How is CR defined?
- NO evidence of disease in marrow or serum.
- NO monoclonal (M) protein in serum or urine by immunofixation with no current evidence of soft tissue plasmacytoma.
- Less than 5 percent clonal plasma cells on bone marrow aspirate
What is concept of MRD testing?
minimal residual disease
- response criteria for MM, prognostic marker but we don’t know how it influences management yet
- use NGS or next generation flow
most impt prognosticator
not CR, but durability of CR
MGUS risk of progression
1%
smoldering myeloma risk of progression
10%
Mm can progress to what?
Plasma cell leukemia
Branching concept in oncology
there are clonal populations of cells and subclonal
In remission in myeloma you may just be suppressing one population while another progresses
most common presentation of multiple myeloma
fatigue from anemia, bone pain, fractures
What are the high risk FISH markers?
del17p
t(4;14)
1q gain
Also (t(14:16), t(14;20)??)
darzalex generic name
daratumumab
what are the plasma cell dyscrasias?
- Plasma cell myeloma, AKA multiple myeloma
- MGUS
- Solitary plasmacytoma
- Primary amyloidosis
- POEMS
- Light and heavy chain deposition diseases
diagnostic criteria for MGUS
1) serum M protein >3 g/dL
2) Clonal plasma cells >10% of bone marrow
3) Absence of end-organ damage
diagnostic criteria for smoldering MM
1) serum M protein >3
2) clonal plasma cells 10-59% of bone marrow
3) no end-organ damage or other myeloma defining event
How is solitary plasmacytoma defined?
Clonal plasma cell mass + NO bone marrow involvement or end organ damage from monoclonal plasma cells. (less than 10% of clonal marrow plasma cells)
- plasmacytoma if patient has MM, is just a plasmacytoma
POEMS stands for
Polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy, skin changes
pathophys of AL amyloidosis
systemic deposition of amyloid protein composed of immunoglobulin light chains
How is MM risk stratified?
Primarily based on chromosomal translocations and LDH level
Risk stratification scoring system
Revised-International Scoring System (RISS)
Variables used for staging in R-ISS?
Serum B2M, albumin, LDH, and genetics (translocations)
general treatment approach for MM
Induction therapy –> collect stem cells if candidate –>
HCT or continuation on therapy if not HCT candidate
Stem cell transplant method used for MM
autologous
age cutoff for HSCT
65
Contraindications to HSCT at most centers in the US
1) Age >77 years
2) Frank cirrhosis of the liver
3) Eastern Cooperative Oncology Group (ECOG) performance status 3 or 4 unless due to bone pain (table 4)
4) New York Heart Association functional status Class III or IV
renal function and eligibility for HCT
Autologous HCT may be safely performed among patients with all stages of kidney disease, even among patients on dialysis. Renal impairment appears to have no adverse effect on either the quality of stem cell collection or engraftment following autologous HCT
bortezomib side effects
peripheral neuropathy, thrombocytopenia, herpes zoster reactivation (viral prophylaxis with acyclovir required)
bortezomib metabolism
- hepatic, dose adjustment for liver dysfunction required
thalidomide SE profile
peripheral neuropathy, constipation, fatigue, edema, somnolence, VTE
lenalidomide SE’s
Fatigue + myelosuppression + constipation/diarrhea + peripheral edema + fever + VTE
lenalidomide metabolism
renal
why are bisphosphonates used in MM?
- decrease risk of skeletal fractures and improve bone-related pain
formulation and dosing of bisphosphonates
Once monthly IV infusion
bisphosphonates SE profile
hypocalcemia, renal insufficiency, osteonecrosis of the jaw
evidence for autologous HCT in MM
- Improved PFS, mixed evidence for OS
when are autologous hematopoietic stem cells collected after induction therapy for MM patients?
Usually after 2-4 months of herapy and cytoreduction by 50% (partial remission)
can someone undergo a second HCT?
Yes, usually enough stem cells are collected to perform two autologous HCTs
Treatment modification for MM patient who is candidate for autologous HCT?
Avoid prolonged therapy with alkylating agents (cyclophosphamide or melphalan) or lenalidomide, which can interfere with stem cell collection
what are the alkylating agents?
cyclophosphamide or melphalan
what does early and late stem cell transplant refer to?
early = immediate transplant following induction therapy late = transplant after relapse
most commonly used induction regimen for standard-risk myeloma
RvD (bortezomib, lenalidomide, dexamethasone)
management of frail patient with MM
Usually 2 drug regimen like bortezomib or lenalidomide with dexamethasone (VD or RD)
Maintenance therapy after induction and HCT
- Lenalidomide-based
- consider adding Bortezomib
How is disease progression defined?
- new serum calcium >11.5
- increase in size of a preexisting bony lesion or plasmacytoma
- appearance of new bony lesions or plasmacytomas
- 25% increase in serum or urine monoclonal immunoglobulin, bone marrow clonal plasma cell percentage, change in kappa/lambda serum FLC ratio.
management of VTE risk with lenalidomide
IF average risk = aspirin daily
IF elevated risk = warfarin
Diagnosis of patient with isolated bone mass + biopsy showing 5% monoclonal plasma cells without other end-organ involvement
solitary plasmacytoma
High risk MM defined as
1) t(14;20)
2) t(14;16)
3) del17p
4) LDH>upper limit of normal
5) evidence of plasma cell leukemia
type of stem cell transplant typically used in MM
autologous
R-ISS incorporates
Beta2 + LDH + albumin + FISH
Factors influencing early vs delayed HCT
Patient preference, risk stratification (early HCT is preferred for high-risk MM), patient age (as age approaches 70, early HCT is preferred), response and tolerability to the initial chemotherapy regimen, insurance approval (some insurers do not cover stem cell harvest and cryopreservation without immediate transplantation), and whether centers have the facilities and resources for long-term storage of stem cells
why there is a limit to number of cycles with MM before stem cells
bortezomib will eventually knock out stem cells
revlimid regulation
Highly regulated because it causes a lot of birth defects. You have to fill out a form after each month. This can occasionally cause delays.
Revlimid formulation
Pill
Bortezomib formulation
Sub q injection
Initial workup if concern for myeloma
SPEP/UPEP + Serum free light chain (FLC) assay
what is M protein
Monoclonal Immunoglobulin produced by clonal population of plasma cells
diagnosis
Clonal bone marrow plasma cells ≥10% or biopsy-proven bony or extramedullary plasmacytoma* and any one or more of the following myeloma-defining events: Hypercalcemia (greater than 11) Renal insufficiency (Cr>2) Anemia (Hgb <10) One or more osteolytic lesions
Imaging for lytic lesions
Whole body noncon CT (just looking at bone)
PET/CT
OR MRI
What is CyBorD regimen?
Cyclophosphamide + Bortezomib + Dexamethasone
Use of CyBorD
Induction therapy for patients with previously untreated multiple myeloma, prior to autologous stem cell transplantation (ASCT).
Initial Management of patient eligible for HCT
Induction therapy with a triplet regimen for three to four months to reduce the number of tumor cells in the bone marrow and peripheral blood, lessen symptoms, and mitigate end-organ damage –> stem cell collection.
Initial management of patient ineligible for HCT
8 to 12 cycles of initial therapy with a triplet regimen –> maintenance therapy until disease progression or unacceptable toxicity
Management of frail, old patient not thought to be candidate for triplet therapy
doublet therapy - hold bortezomib, given lenalidomide and low dose dexamethasone until progression
Why is acyclovir given?
Prophylaxis for herpes zoster due to bortezomib
Indication for PPI
GI ppx if receiving decadron
Preferred induction therapy regimens per NCCN for transplant candidates
RvD firstline
CyBorD if renal failure
prophylaxis recommendations with high dose decadron
1) PCP prophylaxis
2) zoster prophylaxis
3) antifungal ppx (don’t see people do this)
What is an SPEP and relevance to MM
- Serum proteins are separated by an electrical currents into five major fractions by size and electrical charge
- MM appears as a spike in the gamma globulin region
Relation of AL amyloidosis to MM
MM can lead to amyloidosis
Revlimid trade name
Lenalidomide
Bortezomib trade name
Velcade
How to test for minimum residual disease
NGS or next generation flow
Induction regimen typically used for patients with renal failure
CyBorD
Demographic RF’s for MM
More common in men
More common in African Americans
RF’s for developing MM
BMI
?
Presentation
Usually asymptomatic
- fatigue/weakness from anemia
- bone pain
- weight loss
Relation of M protein to total serum protein
*total serum protein level may be normal in patients with MM (eg in light chain MM because free light chains seldom rises to a level that affects the total protein)