Immunoglobulin-Related Amyloidosis Medication
- Author: Slavomir Urbancek, MD, PhD; Chief Editor: Emmanuel C Besa, MD more...
Medication Summary
Melphalan plus prednisone is considered standard therapy for L chain–type amyloidosis, with any myeloma regimen offering a reasonable therapeutic choice.
An anthracycline analogue of 4'-iodo-4'-deoxydoxorubicin is the first small molecule found with in vivo activity to solubilize L chain–type amyloid deposits. The antiamyloid activity of 4'-iodo-4'-deoxydoxorubicin was discovered fortuitously when it was being evaluated as a chemotherapy agent in multiple myeloma. A patient with myeloma and L chain–type amyloidosis excreted L chains into the urine and improved symptomatically within days. 4'-Iodo-4'-deoxydoxorubicin was then demonstrated to bind to amyloid fibrils, although the parent compound, doxorubicin, does not.
Five of 8 patients in the first pilot trial of 4'-iodo-4'-deoxydoxorubicin responded with clinical improvement unrelated to any cytotoxic effect on the plasma cell clone.[23] From 1995 to 1997, 4'-iodo-4'-deoxydoxorubicin was administered to another 42 patients in Europe. Of the 42 patients, 13 had disease responses and 15 demonstrated stabilized disease. However, the clinical responses were transient, and the disease typically progressed after a period of months. From 1999 to 2000, 4'-iodo-4'-deoxydoxorubicin was studied for treatment of L chain–type amyloidosis in a phase II trial at 2 US centers. Results from this trial are not yet available.
The ideal use of small molecule amyloid inhibitors, such as 4'-iodo-4'-deoxydoxorubicin, likely lies in combination with cytotoxic chemotherapy, both to decrease clonal L-chain production and to mobilize deposited L chains. Various small molecules that bind to amyloid fibrils of the L chain – type amyloid and other types are under investigation.
Diuretics are the mainstay of therapy for L chain – type amyloidosis – related congestive heart failure. The optimal degree of diuresis is often difficult to judge. When edema is troubling and symptomatic postural hypotension is not present, fluid can be removed with careful diuresis. Conversely, hypotension resulting from a low ejection fraction and/or autonomic neuropathy may limit diuretic use.
Digoxin and calcium channel blockers are contraindicated in cardiac amyloidosis, because these agents bind to amyloid fibrils, which may worsen heart failure and produce arrhythmias.
Immunosuppressive Agents
Class Summary
Two slightly different regimens of melphalan and prednisone have been used in 2 large studies. Either regimen can be used to treat this condition.
Melphalan (Alkeran) and prednisone (Deltasone, Orasone, Meticorten)
Melphalan reduces clonal plasma cell population. Inhibits mitosis by cross-linking DNA strands. Individual tolerance to melphalan varies. Adjust dosage after the first cycle, based on the degree of cytopenia in the previous cycles. Nadir counts appear 2-3 wk following administration. Should be taken on an empty stomach. Prednisone reduces clonal plasma cell population.
Antineoplastic Agent, Proteasome Inhibitor
Class Summary
Proteasome inhibitors are antineoplastic agents that inhibit cell growth and proliferation.
Bortezomib (Velcade)
First drug approved of anticancer agents known as proteasome inhibitors. The proteasome pathway is an enzyme complex existing in all cells. This complex degrades ubiquitinated proteins that control the cell cycle and cellular processes and maintains cellular homeostasis. Reversible proteasome inhibition disrupts pathways supporting cell growth, thus decreases cancer cell survival.
Immunosuppressant Agents
Class Summary
Immunosuppressant agents may suppress the production of factors that mediate immune reactions.
Thalidomide (Thalomid)
Immunomodulatory agent that may suppress excessive production of tumor necrosis factor-alpha (ie, TNF-alpha) and may downregulate selected cell-surface adhesion molecules involved in leukocyte migration. Because of concerns regarding teratogenicity, thalidomide can only be prescribed by registered physicians and dispensed by registered pharmacists. Patients must participate in ongoing surveys to receive therapy, and only a 28-day supply can be prescribed at a time. Indicated in conjunction with dexamethasone to treat newly diagnosed multiple myeloma.
Lenalidomide (Revlimid)
Indicated for transfusion-dependent MDS subtype of deletion 5q cytogenetic abnormality. Structurally similar to thalidomide. Elicits immunomodulatory and antiangiogenic properties. Inhibits proinflammatory cytokine secretion and increases anti-inflammatory cytokines from peripheral blood mononuclear cells.
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| Trial | N | ORR % | CR/Near CR % | Very good PR % |
| Bortezomib Monotherapy Jagannath et al[18] Anderson et al[14] Dispenzieri et al[15] | 49 63 42 | 49 40 52 | 10 10 0 | 2 NR 5 |
| Bortezomib/Dexamethasone Jagannath et al[18] Harousseau et al[16] | 49 48 | 88 67 | 18 21 | 20 10 |
| Bortezomib/ Doxorubicin/ Dexamethasone Oakervee et al (standard dose)[19] Popat et al (reduced dose)[20] | 21 19 | 95 89 | 29 16 | 33 26 |
| Bortezomib/PLD/Dexamethasone Jakubowiak et al[21] | 28 | 89 | 32 | 21 |

