Lymphoplasmacytic lymphoma medical therapy

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sara Mohsin, M.D.[2]

Overview

Risk stratification determines the protocol of management used for Waldenström macroglobulinemia. There is no treatment for asymptomatic Waldenström macroglobulinemia. The mainstay of treatment for symptomatic Waldenström macroglobulinemia is Rituximab +/- Chemotherapy. Hyperviscosity syndrome is a medical emergency and requires prompt treatment with plasmapheresis.

Medical Therapy

There's no cure for WM/LPL with current therapies. Instead, the treatment goals are to control symptoms and prevent end-organ damage, while maximizing quality of life. There is no standard therapy for the treatment of WM. While various drugs and combinations have demonstrated to have provided clinical benefit, hence, there are several different options for treating Waldenström macroglobulinemia depending on stage of the disease:

Watchful waiting/active surveillance for asymptomatic/Smoldering Waldenström's Macroglobulinemia

There is no treatment for asymptomatic Waldenström macroglobulinemia. As LPL develops slowly and may not need to be treated right away, it is monitored by healthcare team every 3-6 months which is known as watchful waiting/active surveillance and treatment is started when symptoms appear, such as hyperviscosity syndrome, or there are signs that the disease is progressing more quickly. Active surveillance includes monitoring of the following laboratory parameters:

• Complete blood count (CBC) with differential
• Complete metabolic panel (CMP)
• Immunoglobulin levels in the serum (quantitative)
• Serum protein electrophoresis

Symptomatic Waldenström's Macroglobulinemia

Symptomatic patients with waldenström macroglobulinemia are started on chemotherapy depending on the stage.

• Initial stage of waldenström's macroglobulinemia associated with:

• Neuropathy
• Anemia or cytopenias
• Low-volume nodal involvement
• Asymptomatic splenomegaly

• Late stage of Waldenström's macroglobulinemia associated with:

• Adenopathy
• Symptomatic splenomegaly
• Cytopenias
• Hyperviscosity syndrome
• Neuropathy
• Constitutional symptoms

• Men and women with childbearing potential should receive counseling about the potential effect of treatment on their fertility and options for fertility-preserving measures.
• Chemotherapy drugs that may be used with or without prednisone include:
  • Chlorambucil (Leukeran)
  • Fludarabine (Fludara)
  • Bendamustine (Treanda)
  • Cyclophosphamide (Cytoxan, Procytox)

• Combinations of chemotherapy drugs that may be used include:
  • DRC – dexamethasone (Decadron, Dexasone), rituximab (Rituxan) and cyclophosphamide
  • BRD – bortezomib (Velcade) and rituximab, with or without dexamethasone
  • CVP – cyclophosphamide, vincristine (Oncovin) and prednisone
  • R-CVP – CVP with rituximab
  • Thalidomide (Thalomid) and rituximab

Treatment Regimen	Drugs	Side effects
CHOP-R regimen	Cyclophosphamide Doxorubicin Vincristine Prednisone Rituximab	Nausea Alopecia Granulocytopenia Cardiotoxicity Mucositis
Ibrutinib	Ibrutinib	Fatigue Cytopenia Bleeding Atrial fibrillation Opportunistic infection
Rituximab	Rituximab	Infusion related reaction Hepatitis B reaction Progressive multi-focal leukoencephaloptahy
FR regimen	Fludarabine Rituximab	Neutropenia (63%) Thrombocytopenia Pneumonia
BDR regimen	Bortezomib Dexamethasone Rituximab	Peripheral neuropathy - reversible in 61% of patients Infections
DRC regimen	Dexamethasone Rituximab Cyclophosphamide	Neutropenia
CR regimen	Cladribine Rituximab	Anemia Neurological symptoms Symptomatic cryoglobulinemia Thrombocytopenia
IR regimen	Ibrutinib Rituximab	Anemia Neurological symptoms Symptomatic cryoglobulinemia Thrombocytopenia Atrial fibrillation

Helical computed tomographic scanning showed ground-glass shadowing in bilateral lungs before prednisone treatment and a recovery at 1 week post-treatment.Source: Bai X. et al, Department of Hematology, Beijing Tiantan Hospital, Capital Medical University 6 Tiantan Xili Dongcheng District, Beijing, 100050, China.

Hyperviscosity syndrome

• Waldenström macroglobulinemia complicated with hyperviscosity syndrome is a medical emergency and requires prompt treatment with plasmapheresis.
• Plasmapheresis temporarily lowers IgM levels by removing some of the abnormal IgM from the blood, which makes blood thinner.
• Plasmapheresis is usually given until chemotherapy starts to work.
• Plasmapheresis is combined with chemotherapy to control the disease for a longer period of time.

Initial treatment of Waldenstrom macroglobulinemia

Does the patient has an indication for LPL/WM treatment? B symptoms (recurrent fever, night sweats, weight loss, fatigue, hyperviscosity, bulky/symptomatic lymphadenopathy, symptomatic hepatosplenomegaly, symptomatic organomegaly or organ/tissue infiltration, WM associated peripheral neuropathy, cold agglutinin hemolytic anemia, symptomatic cryoglobulinemia, immune hemolytic anemia and/or thrombocytopenia, WM associated AL amyloidosis, WM associated nephropathy, hemoglobin = or < 10g/dl, platelet count = or < 100 x 10'9/L.

Yes

No

Does the patient has symptoms associated with hyperviscosity such as: Oronasal bleeding, blurred vision, headaches, dizziness, paresthesias, retinal vein engorgement, flame-shaped hemorrhages, papilledema, stupor or coma.

No

Yes

For smoldering/asymptomatic WM, just follow up every 4-6 months with CBC and monoclonal protein levels.

Assess degree of symptom burden in WM pateint.

Consider emergent plasmapheresis for treatment of hyperviscosity

Low

Moderate/High

Following are the 2 options for patients with low tumor burden with minimal symptoms: Single agent Rituximab. Rituximab + chemotherapy as with high burden disease.

Following 2 are the preferred regimens for moderate/severe symptoms or high tumor burden: Bendamustine + rituximab. Dexamethasone & rituximab + cyclophosphamide

Drug of choice for Bing-Neel Syndrome

Many recent studies have shown to be Ibrutinib (560mg), an oral Bruton's tyrosine kinase inhibitor, with or without concurrent Rituximab, as a drug of choice for treatment of Bing-Neel syndrome. It works by penetrating the blood brain barrier.

One or more of the following treatments can be given for lymphoplasmacytic lymphoma.

Targeted therapy

• Targeted therapy uses drugs to target specific molecules (such as proteins) on the surface of cancer cells. These molecules help send signals that tell cells to grow or divide. By targeting these molecules, the drugs stop the growth and spread of cancer cells while limiting harm to normal cells.
• Targeted therapy drugs used alone or in combination to treat lymphoplasmacytic lymphoma include rituximab, bortezomib and ibrutinib (Imbruvica).

Immunotherapy

• Immunotherapy works by stimulating, boosting, restoring or acting like the body’s immune system to create a response against cancer cells. Immunomodulatory drugs are a type of immunotherapy that interferes with the growth and division of cancer cells.
• Thalidomide is a type of immunomodulatory drug that may be used to treat lymphoplasmacytic lymphoma.

Radiation therapy

In some rare cases, external beam radiation therapy may be required to treat LPL that develops outside of the lymphatic system (called extralymphatic disease).