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Multiple myeloma

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Multiple myeloma

Multiple myeloma
Micrograph of a plasmacytoma, the histologic correlate of multiple myeloma. H&E stain
Classification and external resources
Specialty Hematology and oncology
ICD-10 C90.0
ICD-9-CM 203.0
ICD-O M9732/3
OMIM 254500
DiseasesDB 8628
MedlinePlus 000583
eMedicine med/1521
MeSH D009101

Multiple myeloma (myelo- + -oma, "marrow" + "tumor"), also known as plasma cell myeloma, myelomatosis, or Kahler's disease (after Otto Kahler), is a cancer of plasma cells, a type of white blood cell normally responsible for producing antibodies.[1] In multiple myeloma, collections of abnormal plasma cells accumulate in the bone marrow, where they interfere with the production of normal blood cells. Most cases of multiple myeloma also feature the production of a paraprotein—an abnormal antibody which can cause kidney problems. Bone lesions and hypercalcemia (high blood calcium levels) are also often encountered.[1]

Multiple myeloma is diagnosed with blood tests (serum protein electrophoresis, serum free kappa/lambda light chain assay), bone marrow examination, urine protein electrophoresis, and X-rays of commonly involved bones. Multiple myeloma is considered to be incurable but treatable. Remissions may be induced with steroids, chemotherapy, proteasome inhibitors, immunomodulatory drugs such as thalidomide or lenalidomide, and stem cell transplants. Radiation therapy is sometimes used to reduce pain from bone lesions.[1] Multiple myeloma develops in 6.1 per 100,000 people per year.[2] It is more common in men and, for unknown reasons, is twice as common in African Americans as it is in White Americans. With conventional treatment, median survival is 3–4 years, which may be extended to 5–7 years or longer with advanced treatments. Multiple myeloma is the second most common hematological malignancy in the U.S. (after non-Hodgkin lymphoma), and constitutes 1% of all cancers.[1] The five year survival rate is 45%.[3]

Contents

  • Signs and symptoms 1
    • Bone pain 1.1
    • Anemia 1.2
    • Kidney failure 1.3
    • Infection 1.4
    • Neurological symptoms 1.5
  • Diagnosis 2
    • Investigations 2.1
    • Work-up 2.2
    • Diagnostic criteria 2.3
    • Staging 2.4
  • Pathophysiology 3
  • Treatment 4
    • Initial therapy 4.1
    • Maintenance therapy 4.2
    • Relapse 4.3
    • Palliative care 4.4
  • Prognosis 5
    • Genetic testing 5.1
  • Epidemiology 6
    • UK 6.1
  • Other animals 7
  • See also 8
  • References 9
  • External links 10

Signs and symptoms

Because many organs can be affected by myeloma, the symptoms and signs vary greatly. A mnemonic sometimes used to remember some of the common symptoms of multiple myeloma is CRAB: C = Calcium (elevated), R = Renal failure, A = Anemia, B = Bone lesions.[4] Myeloma has many other possible symptoms, including opportunistic infections (e.g., pneumonia). CRAB symptoms and proliferation of monoclonal plasma cells in the bone marrow are part of the diagnostic criteria of multiple myeloma.

Bone pain

Illustration showing the most common site of bone lesions in vertebrae

Bone pain affects almost 70% of patients and is the most common symptom.[5] Myeloma bone pain usually involves the spine and ribs, and worsens with activity. Persistent localized pain may indicate a pathological bone fracture. Involvement of the vertebrae may lead to spinal cord compression or kyphosis. Myeloma bone disease is due to the overexpression of Receptor Activator for Nuclear Factor κ B Ligand (RANKL) by bone marrow stroma. RANKL activates osteoclasts, which resorb bone. The resultant bone lesions are lytic (cause breakdown) in nature and are best seen in plain radiographs, which may show "punched-out" resorptive lesions (including the "pepper pot" appearance of the skull on radiography). The breakdown of bone also leads to release of calcium into the blood, leading to hypercalcemia and its associated symptoms.

Anemia

The anemia found in myeloma is usually normocytic and normochromic. It results from the replacement of normal bone marrow by infiltrating tumor cells and inhibition of normal red blood cell production (hematopoiesis) by cytokines.

Kidney failure

Kidney failure may develop both acutely and chronically.

The most common cause of kidney failure in multiple myeloma is due to proteins secreted by the malignant cells. Myeloma cells produce monoclonal proteins of varying types, most commonly immunoglobulins (antibodies) and free light chains, resulting in abnormally high levels of these proteins in the blood. Depending on the size of these proteins, they may be excreted through the kidneys. Kidneys can be damaged by the tubulopathic effects of proteins or light chains. Increased bone resorption leads to hypercalcemia and causes nephrocalcinosis thereby contributing to the kidney failure. Amyloidosis is a distant third in the causation. Patients with amyloidosis have high levels of amyloid protein that can be excreted through the kidneys and cause damage to the kidneys and other organs.

Light chains produce myriad effects which can manifest as the Fanconi syndrome (type II renal tubular acidosis).

Other causes include hyperuricemia, recurrent infections (pyelonephritis), and local infiltration of tumor cells.

Infection

The most common infections are

  • Multiple myeloma at DMOZ

External links

  1. ^ a b c d Raab MS, Podar K, Breitkreutz I, Richardson PG, Anderson KC (July 2009). "Multiple myeloma". Lancet 374 (9686): 324–39.  
  2. ^ a b "SEER Stat Fact Sheets: Myeloma". NCI Surveillance, Epidemiology, and End Results Program. Retrieved 18 August 2014. 
  3. ^ "SEER Stat Fact Sheets: Myeloma". NCI. Retrieved 18 June 2014. 
  4. ^ a b c International Myeloma Working Group (2003). "Criteria for the classification of monoclonal gammopathies, multiple myeloma and related disorders: a report of the International Myeloma Working Group". Br. J. Haematol. 121 (5): 749–57.  
  5. ^ Longo, Dan (2012). Harrison's Principles of Internal Medicine 18th Edition. Mc Graw Hill Medical. p. 938.  
  6. ^ Chapel HM, Lee M (1994). "The use of intravenous immune globulin in multiple myeloma". Clin. Exp. Immunol. 97 (Suppl 1): 21–4.  
  7. ^ Hargreaves RM, Lea JR, Griffiths H, et al. (1995). "Immunological factors and risk of infection in plateau phase myeloma (stable phase)" (PDF). J. Clin. Pathol. 48 (3): 260–6.  
  8. ^ Lonial, Sagar, and Jonathan L. Kaufman. "Non-secretory myeloma: a clinician's guide." Oncology (Williston Park, NY) 27.9 (2013): 924-8.
  9. ^ Mitchell, Richard Sheppard; Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson. "Multiple myeloma". Robbins Basic Pathology (8th ed.). Philadelphia: Saunders. p. 455.  
  10. ^ Frigyesi I (Jan 2014). "Robust isolation of malignant plasma cells in multiple myeloma". Blood 123 (9): 1336–40.  
  11. ^ Kyle RA, Rajkumar SV (January 2009). "Criteria for diagnosis, staging, risk stratification and response assessment of multiple myeloma". Leukemia 23 (1): 3–9.  
  12. ^ a b Greipp PR, San Miguel J, Durie BG, et al. (2005). "International staging system for multiple myeloma". J. Clin. Oncol. 23 (15): 3412–20.  
  13. ^ Durie BG, Salmon SE (1975). "A clinical staging system for multiple myeloma. Correlation of measured myeloma cell mass with presenting clinical features, response to treatment, and survival". Cancer 36 (3): 842–54.  
  14. ^ Federico Caligaris-Cappio; Manlio Ferrarini (1997). Human B Cell Populations. Chemical Immunology 67. Switzerland: S. Karger AG. p. 105.  
  15. ^ a b c Kyle RA, Rajkumar SV (2004). "Multiple myeloma". N. Engl. J. Med. 351 (18): 1860–73.  
  16. ^ Tricot G (2000). "New insights into role of microenvironment in multiple myeloma.". Lancet 355 (9200): 248–50.  
  17. ^ Korde N, Kristinsson SY, Landgren O (2011). "Monoclonal gammopathy of undetermined significance (MGUS) and smoldering multiple myeloma (SMM): novel biological insights and development of early treatment strategies".  
  18. ^ Kyle, R.A., Rajkumar, S.V. (2008). "Multiple myeloma". Blood. 111 (6): 2962–72.  
  19. ^ Multiple myeloma chemotherapy regimens
  20. ^ San Miguel, J.F.; et al. (2008). "Bortezomib plus Melphalan and Prednisone for Initial Treatment of Multiple Myeloma". N. Engl. J. Med. 359 (9): 906–917.  
  21. ^ Curran M, McKeage K. (2009). "Bortezomib: A Review of its Use in Patients with Multiple Myeloma". Drugs 69 (7): 859–888.  
  22. ^ Durie, B.G.M. (2008). "Treatment of Myeloma — Are We Making Progress?". N. Engl. J. Med. 359 (9): 964–6.  
  23. ^ Abraham J (2009). "Advances in multiple myeloma treatment: lenalidomide and bortezomib" (PDF). Community Oncology 6 (2): 53–55.  
  24. ^ Johnson WJ, Kyle RA, Pineda AA, O'Brien PC, Holley KE (April 1990). "Treatment of renal failure associated with multiple myeloma. Plasmapheresis, hemodialysis, and chemotherapy". Arch. Intern. Med. 150 (4): 863–9.  
  25. ^ Paul M, Walker F, Bear RA (November 1982). "Plasmapheresis therapy in a patient with multiple myeloma". Can Med Assoc J 127 (10): 956.  
  26. ^ Harousseau J.-L. (2009). "Maintenance therapy in multiple myeloma". Hematology Reviews 1 (2): e12.  
  27. ^ "Managing the side effects of lenalidomide and bortezomib" (PDF). Community Oncology: 58. 2009. 
  28. ^ The American Society of Clinical Oncology has made this recommendation based on various cancers. See  
  29. ^ Snowden JA, Ahmedzai S, Ashcroft J, et al. (2010). "Guidelines for Supportive Care in Myeloma" (PDF). British Committee for Standards in Haematology. 
  30. ^ Higginson IJ, Evans CJ (2010). "What is the evidence that palliative care teams improve outcomes for cancer patients and their families?". Cancer J 16 (5): 423–35.  
  31. ^ Lorenz KA, Lynn J, Dy SM, Shugarman LR, Wilkinson A, Mularski RA, et al. (2008). "Evidence for improving palliative care at the end of life: a systematic review.". Ann Intern Med 148 (2): 147–59.  
  32. ^ Child JA, Morgan GJ, Davies FE, et al. (May 2003). "High-dose chemotherapy with hematopoietic stem-cell rescue for multiple myeloma". N. Engl. J. Med. 348 (19): 1875–83.  
  33. ^ Seiter, K; Shah, D; Chansky, HA; Gellman, H; Grethlein, SJ; Krishnan, K; Rizvi, SS; Schmitz, MA; Talavera, F; Thomas, LM (23 December 2013). Besa, EC, ed. "Multiple Myeloma Treatment & Management". Medscape Reference. WebMD. Retrieved 2 January 2013. 
  34. ^ Avet-Loiseau H, Li C, Magrangeas F, et al. (September 2009). "Prognostic significance of copy-number alterations in multiple myeloma". J. Clin. Oncol. 27 (27): 4585–90.  
  35. ^ "WHO Disease and injury country estimates". World Health Organization. 2009. Retrieved Nov 11, 2009. 
  36. ^ Lozano, R (Dec 15, 2012). "Global and regional mortality from 235 causes of death for 20 age groups in 1990 and 2010: a systematic analysis for the Global Burden of Disease Study 2010.". Lancet 380 (9859): 2095–128.  
  37. ^ Collins CD (2005). "Problems monitoring response in multiple myeloma". Cancer Imaging 5 (Spec No A): S119–26.  
  38. ^ a b Koura DT, Langston AA (August 2013). "Inherited predisposition to multiple myeloma". Ther Adv Hematol 4 (4): 291–7.  
  39. ^ "Myeloma statistics". Cancer Research UK. Retrieved 28 October 2014. 
  40. ^ Ettinger, Stephen J.; Feldman, Edward C. (1 June 2000). Textbook of Veterinary Internal Medicine: Diseases of the Dog and Cat 1. W.B. Saunders. pp. 516–9.  
  41. ^ MacAllister C, Qualls C, Tyler R, Root CR (August 1987). "Multiple myeloma in a horse". J. Am. Vet. Med. Assoc. 191 (3): 337–9.  
  42. ^ a b c Matus, R.E.; Leifer, C.E.; MacEwen, E.G.; Hurvitz, A.I. (1986). "Prognostic factors for multiple myeloma in the dog". J Am Vet Med Assoc 11 (188): 1288–92.  
  43. ^ MacEwan, E.G.; Hurvitz, A.I. (1977). "Diagnosis and Management of Monoclonal Gammopathies". Vet Clin North American Small Animal Practice 7: 119. 

References

See also

In dogs, multiple myeloma accounts for around 8% of all haemopoietic tumors. Multiple myeloma occurs in older dogs, and is not particularly associated with either males or females. No breeds appear over represented in case reviews that have been conducted.[42] Diagnosis in dogs is usually delayed due to the initial non specificity and range of clinical signs possible. Diagnosis usually involves bone marrow studies, X-rays, and plasma protein studies. In dogs, protein studies usually reveal the monoclonal gammaglobulin elevation to be IgA or IgG in equal incidence.[42] In rare cases the globulin elevation is IgM, which is referred to as Waldenström's macroglobulinemia.[43] The prognosis for initial control and return to good quality of life in dogs is good. 43% of dogs started on a combination chemotheraputic protocol achieved complete remission. Long-term survival is normal, with a median of 540 days reported.[42] The disease eventually recurs, but becomes resistant to available therapies. The complications of kidney failure, sepsis, or pain can lead to an animal's death, frequently by euthanasia.

Multiple myeloma affects many other species. The disease has been diagnosed in dogs,[40] cats, and horses.[41]

Other animals

Myeloma is the 17th most common cancer in the UK (around 4,800 people were diagnosed with the disease in 2011), and it is the 16th most common cause of cancer death (around 2,700 people died in 2012).[39]

UK

A familial predisposition to myeloma exists.[38] Hyperphosphorylation of a number of proteins - the paratarg proteins - a tendency which is inherited in an autosomal dominant manner appears a common mechanism in these families. This tendency is more common in African American patients with myeloma and may contribute to the higher rates of myeloma in this group.[38]

Multiple myeloma affects slightly more men than women. African Americans and Native Pacific Islanders have the highest reported incidence of this disease in the United States and Asians the lowest. Results of a recent study found the incidence of myeloma to be 9.5 cases per 100,000 African Americans and 4.1 cases per 100,000 Caucasian Americans. Among African Americans, myeloma is one of the top 10 leading causes of cancer death.

Multiple myeloma is the second most prevalent blood cancer (10%) after non-Hodgkin's lymphoma.[37] It represents approximately 1% of all cancers and 2% of all cancer deaths.

Multiple myeloma, globally, resulted in about 74,000 deaths in 2010 up from 49,000 in 1990.[36] In the United States in 2014, there will be an estimated 24,050 new cases (incidence) and 11,090 deaths (mortality).[2] These numbers are based on assumptions made using data from 2011, which estimated the prevalence as 83,367 people, the incidence as 6.1 per 100,000 people per year, and the mortality as 3.4 per 100,000 people per year.

Age-standardized death from lymphomas and multiple myeloma per 100,000 inhabitants in 2004.[35]
  no data
  less than 1.8
  1.8–3.6
  3.6–5.4
  5.4–7.2
  7.2–9
  9–10.8
  10.8–12.6
  12.6–14.4
  14.4–16.2
  16.2–18
  18–19.8
  more than 19.8

Epidemiology

Array-based karyotyping cannot detect balanced translocations, such as t(4;14) seen in ~15% of MM. Therefore, FISH for this translocation should also be performed if using SNP arrays to detect genome-wide copy number alterations of prognostic significance in MM.

  1. Virtual karyotyping identified chromosomal abnormalities in 98% of MM cases
  2. del(12p13.31) is an independent adverse marker
  3. amp(5q31.1) is a favorable marker
  4. The prognostic impact of amp(5q31.1) over-rides that of hyperdiploidy and also identifies patients who greatly benefit from high-dose therapy.

SNP array karyotyping can detect copy number alterations of prognostic significance that may be missed by a targeted FISH panel.[34] In MM, lack of a proliferative clone makes conventional cytogenetics informative in only ~30% of cases.

Prognostic markers such as these are always generated by retrospective analyses, and it is likely that new treatment developments will improve the outlook for those with traditionally "poor-risk" disease.

Cytogenetic analysis of myeloma cells may be of prognostic value, with deletion of chromosome 13, non-hyperdiploidy and the balanced translocations t(4;14) and t(14;16) conferring a poorer prognosis. The 11q13 and 6p21 cytogenetic abnormalities are associated with a better prognosis.

Some myeloma centers now employ genetic testing, which they call a “gene array.” By examining DNA, oncologists can determine if patients are high risk or low risk of the cancer returning quickly following treatment.

Genetic testing

The prognoses for patients with multiple myeloma, as those with other diseases, are not the same for everyone. The average age of onset is 70 years. Older patients often are experiencing other serious diseases, which affect survival. Younger patients might have much longer survival rates.

The International Staging System can help to predict survival, with a median survival (in 2005) of 62 months for stage 1 disease, 45 months for stage 2 disease, and 29 months for stage 3 disease.[12]

With high-dose therapy followed by autologous stem cell transplantation, the median survival has been estimated in 2003 to be approximately 4.5 years, compared to a median of approximately 3.5 years with "standard" therapy.[32] Overall the 5-year survival rate is around 35%.[33]

Prognosis

Palliative care is appropriate at any stage of multiple myeloma and can be provided alongside curative treatment. In addition to addressing symptoms of cancer, palliative care helps manage unwanted side-effects, such as pain and nausea related to treatments.[30][31]

Multiple national cancer treatment guidelines recommend early palliative care for people with advanced multiple myeloma at the time of diagnosis as well as for anyone who has significant symptoms.[28][29]

Palliative care

Kidney failure in multiple myeloma can be acute (reversible) or chronic (irreversible). Acute kidney failure typically resolves when the calcium and paraprotein levels are brought under control. Treatment of chronic kidney failure is dependent on the type of kidney failure and may involve dialysis.

In the 21st century, more patients have survived longer, as a result of stem cell transplant (with their own or a donor's) and treatments combining bortezomib (Velcade), dexamethasone and melphalan or cyclophosphamide. This seems to maintain the monoclonal peak at a reasonable level. Survival expectancy has risen. New treatments are under development.

Later in the course of the disease, "treatment resistance" occurs. This may be a reversible effect,[15] and some new treatment modalities may re-sensitize the tumor to standard therapy. For patients with relapsed disease, bortezomib is a recent addition to the therapeutic arsenal, especially as second line therapy, since 2005. Bortezomib is a proteasome inhibitor. Also, lenalidomide (Revlimid), a less toxic thalidomide analog, is showing promise for treating myeloma. The newly approved thalidomide derivative pomalidomide (Pomalyst in the US) may be used for relapsed and refractory multiple myeloma.

The natural history of myeloma is of relapse following treatment. This may be attributed to tumour heterogeneity. Depending on the patient's condition, the prior treatment modalities used and the duration of remission, options for relapsed disease include re-treatment with the original agent, use of other agents (such as melphalan, cyclophosphamide, thalidomide or dexamethasone, alone or in combination), and a second autologous stem cell transplant.

Relapse

In 2009 maintenance therapy with thalidomide, lenalidomide, or bortezomib was still of questionable benefit.[27]

Sometimes after the initial treatment an ongoing maintenance therapy is offered. A 2009 review of maintenance therapy concluded "In younger patients, post-ASCT maintenance therapy with thalidomide appears to increase tumor burden reduction further, which translates in[to] prolonged PFS (Progression-free survival)."[26]

Maintenance therapy

Treatment of related hyperviscosity syndrome may be required to prevent neurologic symptoms or kidney failure.[24][25]

A 2009 review noted "Deep venous thrombosis and pulmonary embolism are the major side effects of thalidomide and lenalidomide. Lenalidomide causes more myelosuppression, and thalidomide causes more sedation. Chemotherapy-induced peripheral neuropathy and thrombocytopenia are major side effects of bortezomib."[23]

Patients over age 65 and patients with significant concurrent illness often cannot tolerate stem cell transplantation. For these patients, the standard of care has been chemotherapy with melphalan and prednisone. Recent studies among this population[20] suggest improved outcomes with new chemotherapy regimens, e.g., with bortezomib.[21] Treatment with bortezomib, melphalan, and prednisone had an estimated overall survival of 83% at 30 months, lenalidomide plus low-dose dexamethasone an 82% survival at 2 years and melphalan, prednisone and lenalidomide had a 90% survival at 2 years. Head-to-head studies comparing these regimens have not been performed.[22]

Initial treatment of multiple myeloma depends on the patient’s age and comorbidities. In recent years, high-dose chemotherapy with autologous hematopoietic stem-cell transplantation has become the preferred treatment for patients under the age of 65. Prior to stem-cell transplantation, these patients receive an initial course of induction chemotherapy. The most common induction regimens used today are lenalidomidedexamethasone, bortezomib based regimens, and lenalidomide–dexamethasone.[18][19] Autologous stem cell transplantation (ASCT), the transplantation of a patient’s own stem cells after chemotherapy, is the most common type of stem cell transplantation for multiple myeloma. It is not curative, but does prolong overall survival and complete remission. Allogeneic stem cell transplantation, the transplantation of a healthy person’s stem cells into the affected patient, has the potential for a cure, but is used in a very small percentage of patients (and in the relapsed setting, not as part of initial treatment).[15] Furthermore, there is a 5–10% treatment-associated mortality rate associated with allogeneic stem cell transplant.

Initial therapy

In addition to direct treatment of the plasma cell proliferation, bisphosphonates (e.g., pamidronate or zoledronic acid) are routinely administered to prevent fractures; they have also been observed to have direct anti-tumor effect even in patients without known skeletal disease. If needed, red blood cell transfusions or erythropoietin can be used for management of anemia. Bortezomib has the first therapeutic proteasome inhibitor approved by the U.S. FDA for treating relapsed multiple myeloma.

Treatment for multiple myeloma is focused on therapies that decrease the clonal plasma cell population and consequently decrease the signs and symptoms of disease. If the disease is completely asymptomatic (i.e. there is a paraprotein and an abnormal bone marrow population but no end-organ damage), as in asymptomatic ("smoldering") myeloma, treatment is typically deferred, or restricted to clinical trials.[17]

Treatment

The produced antibodies are deposited in various organs, leading to kidney failure, polyneuropathy and various other myeloma-associated symptoms.

Production of cytokines[16] (especially IL-6) by the plasma cells causes much of their localised damage, such as osteoporosis, and creates a microenvironment in which the malignant cells thrive. Angiogenesis (the attraction of new blood vessels) is increased.

A chromosomal translocation between the immunoglobulin heavy chain gene (on chromosome 14, locus q32) and an oncogene (often 11q13, 4p16.3, 6p21, 16q23 and 20q11[15]) is frequently observed in patients with multiple myeloma. This mutation results in dysregulation of the oncogene which is thought to be an important initiating event in the pathogenesis of myeloma. The result is proliferation of a plasma cell clone and genomic instability that leads to further mutations and translocations. The chromosome 14 abnormality is observed in about 50% of all cases of myeloma. Deletion of (parts of) chromosome 13 is also observed in about 50% of cases.

The immune system keeps the proliferation of B cells and the secretion of antibodies under tight control. When chromosomes and genes are damaged, often through rearrangement, this control is lost. Often, a promoter gene moves (or translocates) to a chromosome where it stimulates an antibody gene to overproduction.

Multiple myeloma develops in B lymphocytes after they have left the part of the lymph node known as the germinal center. The normal cell line most closely associated with MM cells is generally taken to be either an activated memory B cell or the precursor to plasma cells, the plasmablast.[14]

B lymphocytes start in the bone marrow and move to the lymph nodes. As they progress, they mature and display different proteins on their cell surface. When they are activated to secrete antibodies, they are known as plasma cells.

Pathophysiology

  • A: serum creatinine < 2 mg/dL (< 177 μmol/L)
  • B: serum creatinine > 2 mg/dL (> 177 μmol/L)

Stages I, II, and III of the Durie-Salmon staging system can be divided into A or B depending on serum creatinine:

  • stage I: all of
    • Hb > 10g/dL
    • normal calcium
    • Skeletal survey: normal or single plasmacytoma or osteoporosis
    • Serum paraprotein level < 5 g/dL if IgG, < 3 g/dL if IgA
    • Urinary light chain excretion < 4 g/24h
  • stage II: fulfilling the criteria of neither I nor III
  • stage III: one or more of
    • Hb < 8.5g/dL
    • high calcium > 12 mg/dL
    • Skeletal survey: Three or more lytic bone lesions
    • Serum paraprotein > 7g/dL if IgG, > 5 g/dL if IgA
    • Urinary light chain excretion > 12g/24h

First published in 1975, the Durie-Salmon staging system[13] is still in use. However, one of the limitations of the Durie-Salmon staging system is the subjectivity in determining the extent of bone disease.

Durie-Salmon staging system

Note that the ISS should be used only in patients who meet diagnostic criteria for myeloma. Patients with MGUS and asymptomatic myeloma who have kidney dysfunction from unrelated causes such as diabetes or hypertension may have elevated β2M levels from the kidney dysfunction and cannot be considered as stage III myeloma. This is one of the limitations of the ISS. It does not really quantify tumor burden or extent unlike staging systems used in other cancers. It is more of a prognostic index rather than a true staging system. For this reason, it is recommended that the ISS be used along with the Durie-Salmon Staging System (see below).

  • Stage I: β2 microglobulin (β2M) < 3.5 mg/L, albumin ≥ 3.5 g/dL
  • Stage II: β2M < 3.5 mg/L and albumin < 3.5 g/dL; or β2M 3.5–5.5 mg/L irrespective of the serum albumin
  • Stage III: β2M ≥ 5.5 mg/L

The International Staging System (ISS) for myeloma was published by the International Myeloma Working Group in 2005:[12]

International Staging System

Staging

Related conditions include solitary plasmacytoma (a single tumor of plasma cells, typically treated with irradiation), plasma cell dyscrasia (where only the antibodies produce symptoms, e.g., AL amyloidosis), and POEMS syndrome (peripheral neuropathy, organomegaly, endocrinopathy, monoclonal plasma cell disorder, skin changes).

  • Asymptomatic /smouldering myeloma:
  • Serum paraprotein >30 g/L AND/OR
  • Clonal plasma cells >10% on bone marrow biopsy AND
  • NO myeloma-related organ or tissue impairment
  • Monoclonal gammopathy of undetermined significance (MGUS):
  • Serum paraprotein <30 g/L AND
  • Clonal plasma cells <10% on bone marrow biopsy AND
  • NO myeloma-related organ or tissue impairment

Note: Recurrent infections alone in a patient who has none of the CRAB features is not sufficient to make the diagnosis of myeloma. Patients who lack CRAB features but have evidence of amyloidosis should be considered as amyloidosis and not myeloma. CRAB like abnormalities are common with numerous diseases, and it is imperative that these abnormalities are felt to be directly attributable to the related plasma cell disorder and every attempt made to rule out other underlying causes of anemia, kidney failure, etc.

  • Symptomatic myeloma:
  • Clonal plasma cells >10% on bone marrow biopsy or (in any quantity) in a biopsy from other tissues (plasmacytoma)
  • A monoclonal protein (paraprotein) in either serum or urine (except in cases of true non-secretory myeloma)
  • Evidence of end-organ damage felt related to the plasma cell disorder (related organ or tissue impairment, ROTI, commonly referred to by the acronym "CRAB"):

In 2003, the International Myeloma Working Group[4] agreed on diagnostic criteria for symptomatic myeloma, asymptomatic myeloma and MGUS (monoclonal gammopathy of undetermined significance), which was subsequently updated in 2009:[11]

Diagnostic criteria

The prognosis of myeloma varies widely depending upon various risk factors. The Mayo Clinic has developed a risk-stratification model termed Mayo Stratification for Myeloma and Risk-adapted Therapy (mSMART) which divides patients into high-risk and standard-risk categories. Patients with deletion of chromosome 13 or hypodiploidy by conventional cytogenetics, t(4;14), t(14;16) or 17p- by molecular genetic studies, or with a high plasma cell labeling index (3% or more) are considered to have high-risk myeloma.

This assay, the serum free light chain assay, has recently been recommended by the International Myeloma Working Group for the screening, diagnosis, prognosis, and monitoring of plasma cell dyscrasias.

The recent introduction of a commercial immunoassay for measurement of free light chains potentially offers an improvement in monitoring disease progression and response to treatment, particularly where the paraprotein is difficult to measure accurately by electrophoresis (for example in light chain myeloma, or where the paraprotein level is very low). Initial research also suggests that measurement of free light chains may also be used, in conjunction with other markers, for assessment of the risk of progression from monoclonal gammopathy of undetermined significance (MGUS) to multiple myeloma.

Other useful laboratory tests include quantitative measurement of IgA, IgG, IgM (immunoglobulins) to look for immune paresis, and beta-2 microglobulin which provides prognostic information. On peripheral blood smear the rouleaux formation of red blood cells is commonly seen, though this is not specific.

Historically, the CD138 has been used to isolate myeloma cells for diagnostic purposes. However, this antigen disappears rapidly ex vivo. Recently, however, it was discovered that the surface antigen CD319 (SLAMF7) is considerably more stable and allows robust isolation of malignant plasma cells from delayed or even cryopreserved samples.[10]

A bone marrow biopsy is usually performed to estimate the percentage of bone marrow occupied by plasma cells. This percentage is used in the diagnostic criteria for myeloma. Immunohistochemistry (staining particular cell types using antibodies against surface proteins) can detect plasma cells which express immunoglobulin in the cytoplasm and occasionally on the cell surface; myeloma cells are typically CD56, CD38, CD138, CD319 positive and CD19 and CD45 negative.[4] Cytogenetics may also be performed in myeloma for prognostic purposes, including a myeloma-specific FISH and Virtual Karyotype.

The work-up of suspected multiple myeloma includes a skeletal survey. This is a series of X-rays of the skull, axial skeleton and proximal long bones. Myeloma activity sometimes appear as "lytic lesions" (with local disappearance of normal bone due to resorption), and on the skull X-ray as "punched-out lesions" (pepper pot skull). Magnetic resonance imaging (MRI) is more sensitive than simple X-ray in the detection of lytic lesions, and may supersede skeletal survey, especially when vertebral disease is suspected. Occasionally a CT scan is performed to measure the size of soft tissue plasmacytomas. Bone scans are typically not of any additional value in the workup of myeloma patients (no new bone formation; lytic lesions not well visualized on bone scan).

A 59-year-old patient presented with a left facial droop and a known history of multiple myeloma. A CT of the brain was performed looking for a cerebral cause. The brain appeared normal. Close inspection revealed a lytic lesion in the left temporal bone (right side of image), and focused reconstructions of the petrous temporal bones confirmed a lytic lesion involving the mastoid segment of the facial nerve canal. Red arrows: lesion; green arrow: normal contralateral facial nerve canal. The lytic lesion was one of many in the skull and is consistent with a myeloma deposit.

Work-up

Additional findings may include: a raised calcium (when osteoclasts are breaking down bone, releasing calcium into the bloodstream), raised serum creatinine due to reduced kidney function, which is mainly due to casts of paraprotein deposition in the kidney, although the cast may also contain complete immunoglobulins, Tamm-Horsfall protein and albumin.[9]

In theory, multiple myeloma can produce all classes of immunoglobulin, but IgG paraproteins are most common, followed by IgA and IgM. IgD and IgE myeloma are very rare. In addition, light and or heavy chains (the building blocks of antibodies) may be secreted in isolation: κ- or λ-light chains or any of the five types of heavy chains (α-, γ-, δ-, ε- or μ-heavy chains). Patients without evidence of a monoclonal protein may have "nonsecretory" myeloma (not producing immunoglobulins); this represents approximately 3% of all multiple myeloma patients.[8]

The presence of unexplained anemia, kidney dysfunction, a high erythrocyte sedimentation rate (ESR), lytic bone lesions, elevated beta-2 microglobulin, and/or a high serum protein (especially raised globulins or immunoglobulin) may prompt further testing. The globulin level may be normal in established disease. A doctor will request protein electrophoresis of the blood and urine, which might show the presence of a paraprotein (monoclonal protein, or M protein) band, with or without reduction of the other (normal) immunoglobulins (known as immune paresis). One type of paraprotein is the Bence Jones protein which is a urinary paraprotein composed of free light chains (see below). Quantitative measurements of the paraprotein are necessary to establish a diagnosis and to monitor the disease. The paraprotein is an abnormal immunoglobulin produced by the tumor clone.

Serum protein electrophoresis showing a paraprotein (peak in the gamma zone) in a patient with multiple myeloma.

Investigations

Diagnosis

When the disease is well-controlled, there may be neurological symptoms resulting from current treatments, some of which may cause peripheral neuropathy, manifesting itself as numbness or pain in the hands, feet, and lower legs.

Some problems (e.g., weakness, confusion and fatigue) may be due to anemia or hypercalcemia. Headache, visual changes and retinopathy may be the result of hyperviscosity of the blood depending on the properties of the paraprotein. Finally, there may be radicular pain, loss of bowel or bladder control (due to involvement of spinal cord leading to cord compression) or carpal tunnel syndrome and other neuropathies (due to infiltration of peripheral nerves by amyloid). It may give rise to paraplegia in late presenting cases.

Neurological symptoms

[7] therapy to reduce the risk of infection.immunoglobulin may benefit from replacement hypogammaglobulinemia level is typically elevated in multiple myeloma, the majority of the antibodies are ineffective monoclonal antibodies from the clonal plasma cell. A selected group of patients with documented immunoglobulin The increased risk of infection is due to immune deficiency. Although the total [6]

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