How to evaluate vitamin and iron deficiency in practice?
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1 How to evaluate vitamin and iron deficiency in practice? Y Beguin University of Liège Belgium
2 COI DECLARATION Advisory board : Vifor, Pharmacosmos, Amgen Speakers bureau : Vifor, Amgen Consultant : Amgen, Helsinn
3 B12 & folate deficiency in cancer
4 VITAMIN B12 Vitamin B12 : metabolism & deficiency Requirements : 2-5 µg/day (meat, fish, egg, milk) Absorption requires intrinsic factor (IF) secreted by gastric parietal cells for absorption in terminal ileum Storage : 2-5 mg (liver) enough for 2-4 yrs
5 VITAMIN B12 Vitamin B12 : metabolism & deficiency Requirements : 2-5 µg/day (meat, fish, egg, milk) Absorption requires intrinsic factor (IF) secreted by gastric parietal cells for absorption in terminal ileum Storage : 2-5 mg (liver) enough for 2-4 yrs Deficiency - Inappropriate diet : malnutrition, vegetarian diet - Defective IF * Biermer = pernicious anemia (autoimmune gastric atrophy) * Gastrectomy - Malabsorption : caeliac disease, tropical sprue, Crohn, ileal resection - Competition * Bacteria : blind loop syndrome (diverticulae or localized inflam.) * Fish tapeworm (Diphyllobothrium latum) 3-7% of cancer patients
6 VITAMIN B12 Vitamin B12 deficiency : diagnosis Vitamin B12 in serum pg/ml Stage 1 Serum B12 normal to < 200 pg/ml Stage 2 (1-2 yrs) Serum B12 < 150 pg/ml Macrocytosis, hypersegmented neutrophils Stage 3 (> 3 yrs) Serum B12 < 100 pg/ml Megaloblastic anemia, anisopoikilocytosis, N retics LDH & bilirubin, SeFe & Tsat Thrombocytopenia, leucopenia Hunter s glossitis & neuropathy (spinal cord degeneration)
7 VITAMIN B12 Vitamin B12 deficiency : diagnosis Vitamin B12 in serum pg/ml Stage 1 Serum B12 normal to < 200 pg/ml Stage 2 (1-2 yrs) Serum B12 < 150 pg/ml Macrocytosis, hypersegmented neutrophils Stage 3 (> 3 yrs) Serum B12 < 100 pg/ml Megaloblastic anemia, anisopoikilocytosis, N retics LDH & bilirubin, SeFe & Tsat Thrombocytopenia, leucopenia Hunter s glossitis & neuropathy (spinal cord degeneration) Biermer - Gastric parietal cell antibodies : 80-90% but nonspecific - Intrinsic factor antibodies : 55% but specific - Abnormal Schilling absorption test corrected by IF
8 FOLATE Folate : metabolism & deficiency Requirements : µg/day (liver, nuts, vegetables) Absorption in proximal jejunum Storage : mg (RBC) enough for 3-4 mo
9 FOLATE Folate : metabolism & deficiency Requirements : µg/day (liver, nuts, vegetables) Absorption in proximal jejunum Storage : mg (RBC) enough for 3-4 mo Deficiency - Poor nutrition : poverty, age, alcoholism - Malabsorption * Caeliac disease, tropical sprue, Crohn * Drugs : phenytoin, barbiturates, valproate, OC, nitrofurantoin - Increased needs : pregnancy, hyperplastic erythropoiesis, dialysis, exfoliative dermatitis - Altered usage * Alcoholism * Anti-folate drugs : MTX, trimetoprim, pyrimethamin, pentamidine 0.5-1% of cancer patients
10 FOLATE Folate deficiency : diagnosis Folate in serum Folate in RBC 5-18 ng/ml ng/ml Stage 1 (3 wks) serum folate Stage 2 (7 wks) Hypersegmented neutrophils Stage 3 (16 wks) RBC folate Macrocytosis Stage 4 (20 wks) : as B12 deficiency without glossitis/neuropathy Megaloblastic anemia, anisopoikilocytosis, N retics LDH & bilirubin, SeFe & Tsat Thrombocytopenia, leucopenia
11 B12 OR FOLATE DEFICIENCY Treatment Vitamin B12 (give also 5 mg/d folate) - IM : hydroxocobalamin > cyanocobalamin * 1 mg / d x 5, 1 mg / wk x 5, 1 mg / mo if necessary (Biermer ) - PO (if mild deficiency) : mg/d apart from meals Folate (not without verifying that B12 is normal) - PO : mg/d x 2 mo + 5 mg/d thereafter if necessary Rest, O 2 : if severe anemia Monitor K : possible hypokalemia Avoid transfusions : worsened leucopenia/thrombocytopenia Treat underlying cause
12 Iron deficiency in cancer
13 IRON METABOLISM Internal iron exchanges Circulating RBC 25 mg Erythroid marrow Iron turnover in mg per day; 1 mg iron is lost per day 3 mg Liver Plasma 1 mg Intestinal absorption 3 mg Fe Macrophages (RE cells) 25 mg
14 Nicolas, Blood Cells Mol Dis 29:327, 2002 IRON METABOLISM Regulation by hepcidin Hypoxia Erythropoiesis Iron deficiency Inflammation Iron overload
15 IRON DEFICIENCY Absolute vs functional Absolute iron deficiency µ anemia = no iron stores : ferritin < 20 µg/l in N individual < 100 µg/l in infl/cancer patient Functional iron deficiency = iron stores present but ID in erythroid bone marrow a) Iron sequestration in macrophages µ / N anemia - Inflammation (ACD, anemia of chronic disease) b) Increased iron requirements N anemia - EPO therapy
16 FUNCTIONAL IRON DEFICIENCY ACD (cancer, inflammation) ID erythropoiesis despite normal-increased iron stores Impaired iron absorption (1 mg/d) Inhibition of storage iron release (25 mg/d) Mediator = hepcidin 40% of cancer patients ASH slide bank
17 FUNCTIONAL IRON DEFICIENCY ACD (cancer, inflammation) ID erythropoiesis despite normal-increased iron stores Impaired iron absorption (1 mg/d) Inhibition of storage iron release (25 mg/d) Mediator = hepcidin 40% of cancer patients FID Hypochromic microcytic anemia if long duration Normochromic normocytic anemia if short duration SeFe & TSat N- Ferritin ASH slide bank
18 ID in cancer Diagnostic parameters
19 IRON PARAMETERS Storage iron : serum ferritin Circulating RBC Erythroid marrow Liver Macrophages (RE cells) Plasma
20 FERRITIN Serum ferritin Represents iron stores (macrophages and hepatocytes) 1 µg/l = 120 µg/kg storage iron Low ferritin < 20 µg/l (12-30 according to assay) 100% specific for iron deficiency Normal range varies with age and sex ASH slide bank
21 FERRITIN Serum ferritin in inflammation Conditions with falsely elevated serum ferritin Inflammation (including cancer) Lower limit = 100 (40 120) µg/l Lower levels define absolute ID in cancer patients
22 FERRITIN Serum ferritin in inflammation Conditions with falsely elevated serum ferritin Inflammation (including cancer) Lower limit = 100 (40 120) µg/l Lower levels define absolute ID in cancer patients Normal Inflammation Serum ferritin (µg/l) Adequate iron stores Absolute ID
23 FERRITIN Serum ferritin interpretation Conditions with falsely elevated serum ferritin Inflammation (including cancer) Lower limit = 100 (40 120) µg/l Lower levels define absolute ID in cancer patients Some forms of cancer (e.g. neuroblastoma) Renal failure (lower limit µg/l) Liver damage Hyperthyroidism Poorly controlled diabetes mellitus (ferritin glycosylation) Hyperferritin-cataract syndrome Benign hyperferritinemia
24 FERRITIN Serum ferritin interpretation Conditions with falsely elevated serum ferritin Inflammation (including cancer) Lower limit = 100 (40 120) µg/l Lower levels define absolute ID in cancer patients Some forms of cancer (e.g. neuroblastoma) Renal failure (lower limit µg/l) Liver damage Hyperthyroidism Poorly controlled diabetes mellitus (ferritin glycosylation) Hyperferritin-cataract syndrome Benign hyperferritinemia Absolute ID = no iron stores ferritin < 20 µg/l in normal individual < 100 µg/l in cancer patient
25 IRON PARAMETERS Plasma iron : transferrin saturation Circulating RBC Erythroid marrow Liver Macrophages (RE cells) Plasma
26 TRANSFERRIN SATURATION Normal SeFe 8-30 µmol/l Tsat % Fe Fe Red blood cells Macrophages Plasma Transferrin Marrow Senescent RBCs taken-up by macrophages Recycling and storage of iron from red blood cells Dynamic equilibrium of transferrin saturation Sufficient iron available for erythropoiesis
27 TRANSFERRIN SATURATION Normal SeFe 8-30 µmol/l Tsat % Fe Fe Red blood cells Macrophages Plasma Transferrin Marrow Senescent RBCs taken-up by macrophages Recycling and storage of iron from red blood cells Dynamic equilibrium of transferrin saturation Sufficient iron available for erythropoiesis
28 Red blood cells Macrophages Plasma transferrin Marrow TRANSFERRIN SATURATION (Functional) iron deficiency Absolute ID Empty iron stores
29 Red blood cells Macrophages Plasma transferrin Marrow TRANSFERRIN SATURATION (Functional) iron deficiency Absolute ID Empty iron stores Functional ID (Inflammation/cancer) Blocked iron release FID
30 TRANSFERRIN SATURATION (Functional) iron deficiency Absolute ID Empty iron stores Functional ID (Inflammation/cancer) Blocked iron release FID TSat < 20% %HYPO > 5% CHr < 28 pg Functional ID (EPO therapy) FID Iron need exceeds delivery Red blood cells Macrophages Plasma transferrin Marrow
31 IRON PARAMETERS Erythroid marrow: stfr Circulating RBC Erythroid marrow Liver Macrophages (RE cells) Plasma
32 stfr (mg/l) SOLUBLE TRANSFERRIN RECEPTOR ACD vs. ID vs. combined ACD+ID stfr 3-7 µg/l Infl (ACD) ID ACD + ID Normal
33 IRON PARAMETERS RBC iron: % HYPO and CHr Circulating RBC Erythroid marrow Liver Macrophages (RE cells) Plasma
34 RBC INDICES %HYPO & CHr Hypochromic erythrocytes Normal : < 5% ID erythropoiesis : > 5 10 % long term indicator of ID erythropoiesis (RBC lifespan : 120 d) % Hypo 24.4% Brugnara, Blood 83:3100, 1994
35 Number of cells RBC INDICES %HYPO & CHr Hypochromic erythrocytes Normal : < 5% ID erythropoiesis : > 5 10 % long term indicator of ID erythropoiesis (RBC lifespan : 120 d) % Hypo 24.4% Hb content of reticulocytes (CHr) Normal : pg ID erythropoiesis : < 28 pg short term indicator of ID erythropoiesis (Retic lifespan : 4 d) Day 0 Day 4 Day 13 MCH CHr 0 Haemoglobin (pg/cell) Brugnara, Blood 83:3100, 1994
36 RBC INDICES %HYPO & CHr Hypochromic erythrocytes Normal : < 5% ID erythropoiesis : > 5 10 % long term indicator of ID erythropoiesis (RBC lifespan : 120 d) % Hypo 24.4% Hb content of reticulocytes (CHr) Normal : pg ID erythropoiesis : < 28 pg short term indicator of ID erythropoiesis (Retic lifespan : 4 d) Brugnara, Blood 83:3100, 1994
37 IRON METABOLISM Hepcidin Circulating RBC Erythroid marrow Liver Macrophages (RE cells) Plasma Intestinal absorption
38 HEPCIDIN Serum hepcidin NL = normal, CRP = inflammation, MM = multiple myeloma, ACKD & PCKD = adult & pediatric CKD (not dialyzed), IDA = ID anemia, Ganz et al. Blood 2008;112:4292
39 IRON DEFICIENCY Cancer : absolute vs functional ID Low Tsat Absolute ID Low Ferritin Functional ID N-High
40 IRON DEFICIENCY Cancer : absolute vs functional ID Low Tsat Absolute ID Low Ferritin Functional ID N-High Absolute iron deficiency Depleted body iron stores Low serum ferritin (< 100 ng/ml) TSAT < 20%
41 IRON DEFICIENCY Cancer : absolute vs functional ID Low Tsat Absolute ID Low Ferritin Functional ID N-High Absolute iron deficiency Functional iron deficiency Depleted body iron stores Low serum ferritin (< 100 ng/ml) TSAT < 20% Inadequate iron supply to meet demand despite normal or abundant iron stores Normal or high ferritin (> 100 ng/ml) TSAT < 20%
42 IRON DEFICIENCY IN CANCER ID in cancer At initial diagnosis (40%) Monthly during FU Absolute ID (no iron stores) Ferritin < 100 ng/ml Low hepcidin Functional ID (iron stores +/++) Ferritin 100 ng/ml High hepcidin IDA TSAT <20% ACD Microcytic hypochromic A Microcytic hypochromic A (chronic) Normocytic normochromic A (acute) IV iron ESA + IV iron
43 FUNCTIONAL ID Overcoming hepcidin block with IV iron Ferroportin RBC Tf Hentze et al, Cell 142:24, 2010 Delaby et al, Blood 106: 3979, 2005 Beaumont, Haematologica 95:1233, 2010
44 FUNCTIONAL ID Overcoming hepcidin block with IV iron Ferroportin RBC Tf Hepcidin IL-6 Hentze et al, Cell 142:24, 2010 Delaby et al, Blood 106: 3979, 2005 Beaumont, Haematologica 95:1233, 2010
45 FUNCTIONAL ID Overcoming hepcidin block with IV iron IV iron Tf Ferroportin RBC Tf Hepcidin IL-6 Hentze et al, Cell 142:24, 2010 Delaby et al, Blood 106: 3979, 2005 Beaumont, Haematologica 95:1233, 2010
46 How to evaluate vitamin and iron deficiency in practice? Conclusions
47 Anemic cancer patient C O N C L U S I O N Folate Serum folate < 5 ng/ml 1% cancer patients Step 1 Absolute hematinic deficiency? Iron Serum ferritin < 100 ng/ml 15% cancer patients Step 3 : functional ID? TSat < 20% (or HYPO < 5% or CHr < 28 pg) Before & during treatment B12 Serum B12 < 200 pg/ml 5% cancer patients Folate (PO) Iron (IV) B12 (PO / IV) Step 2 ESA therapy (EORTC guidelines)? W&W W&W No No Yes Yes ESA (SC) Iron (IV)
48 Anemic cancer patient C O N C L U S I O N Folate Serum folate < 5 ng/ml 1% cancer patients Step 1 Absolute hematinic deficiency? Iron Serum ferritin < 100 ng/ml 15% cancer patients Step 3 : functional ID? TSat < 20% (or HYPO < 5% or CHr < 28 pg) Before & during treatment B12 Serum B12 < 200 pg/ml 5% cancer patients Folate (PO) Iron (IV) B12 (PO / IV) Step 2 ESA therapy (EORTC guidelines)? W&W W&W No No Yes Yes ESA (SC) Iron (IV)
49 Anemic cancer patient C O N C L U S I O N Folate Serum folate < 5 ng/ml 1% cancer patients Step 1 Absolute hematinic deficiency? Iron Serum ferritin < 100 ng/ml 15% cancer patients Step 3 : functional ID? TSat < 20% (or HYPO < 5% or CHr < 28 pg) Before & during treatment B12 Serum B12 < 200 pg/ml 5% cancer patients Folate (PO) Iron (IV) B12 (PO / IV) Step 2 ESA therapy (EORTC guidelines)? W&W W&W No No Yes Yes ESA (SC) Iron (IV)
50 Anemic cancer patient C O N C L U S I O N Folate Serum folate < 5 ng/ml 1% cancer patients Step 1 Absolute hematinic deficiency? Iron Serum ferritin < 100 ng/ml 15% cancer patients Step 3 : functional ID? TSat < 20% (or HYPO < 5% or CHr < 28 pg) Before & during treatment B12 Serum B12 < 200 pg/ml 5% cancer patients Folate (PO) Iron (IV) B12 (PO / IV) Step 2 ESA therapy (EORTC guidelines)? W&W W&W No No Yes Yes ESA (SC) Iron (IV)
51 THANK YOU!
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