Transcript
Page 1: Thyroid Nodules, Vitamin D and Osteoporosis · 2. Management of thyroid nodules based on the results of fine needle aspiration 3. Role of Vitamin D in human health 4. Evaluation of

DOS CME Course 2014 1 DOS CME Course 2011 1 Oxtober 2010 1 Confidential

Thyroid Nodules, Vitamin D and Osteoporosis

Krupa Doshi, MD

Dept.of Endocrinology Endocrinology and Metabolism Institute Cleveland Clinic

© Cleveland Clinic 2014

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Disclosures • None

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1. Evaluation of thyroid nodules

2. Management of thyroid nodules based on the results of

fine needle aspiration

3. Role of Vitamin D in human health

4. Evaluation of patients with low bone mineral density

5. Treatment options for patients with low bone mineral

density and osteoporosis

Objectives

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Thyroid Nodules

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• A thyroid nodule is a distinct lesion within the thyroid gland which radiologically distinct from the surrounding thyroid parenchyma

Definition

Raddaily.com

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How Common Are Thyroid Nodules?

Mazzaferri NEJM 1993;328:553

USG

Palpation

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• Subnormal – Radioactive iodine uptake and scan

First Step…Measure TSH

Cold Hot

Soule et.al.Thyroid. 2001 Stocker et.al.Thyroid. 2002

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If TSH is Normal or Elevated…

• Perform thyroid USG

firsthealthassociates.com

Raddaily.com

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What is the role of Fine Needle Aspiration (FNA) biopsy?

• Accurate and cost effective

• Procedure of choice in evaluation of thyroid nodules

• USG guidance recommended for nodules that are non palpable, posteriorly located or predominantly cystic

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Which nodules should be evaluated by FNA? • Generally, only nodules > 1 cm

• < 1 cm with “suspicious” USG findings: – Associated lymphadenopathy – H/o thyroid cancer or thyroid cancer syndromes in first degree

relative – Head/neck radiation

• 18FDG-PET positive

webalice.it

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US Characteristics Predictive of Benign Nodule • Hyperechoic nodule

Spongiform nodule

internalmedicinenews.com

Yoon et.al.J Ultrasound Medicine . 2007

ultrasoundcases.info

endocrineweb.com

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Smith-Bindman et.al. JAMA 2013;173:1788

US Characteristics Suspicious for Malignancy

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Dai et. al. Thyroid 2010; 20:51

US Characteristics Suspicious For Malignancy

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Cytopathological Interpretation of Thyroid Nodules

Bethesda system of reporting thyroid Cytopathology

Implied risk of malignancy and recommended clinical management

Chibas and Ali Thyroid 2009;19:1159

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Management of Multiple Thyroid Nodules • In the presence of two or more thyroid nodules >1 cm,

those with a suspicious sonographic appearance should be aspirated preferentially (B)

• If none of the nodules has a suspicious sonographic appearance and multiple sonographically similar coalescent nodules with no intervening normal parenchyma are present, the likelihood of malignancy is low and it is reasonable to aspirate the largest nodules only and observe the others with serial US examinations.(C)

American Thyroid Association Guidelines 2009

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• Follow up all benign nodules with serial USG – 6-18 months after initial FNA

• There is ~ 5% false negative rate of FNA diagnosed benign thyroid nodules – Higher rate for nodules > 4 cm

Long Term Follow Up of Thyroid Nodules

If stable in size, increase follow up interval

If evidence of growth, repeat FNA, preferably

with US guidance

American Thyroid Association Guidelines 2009

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• 15 - 30 % of aspirates may be indeterminate

• Next step surgery

• 2/3rd are benign - confirmed post surgery

• There is a 2 - 10% chance of post-op complications and most need lifelong Lt4 Rx

• 60-70% of thyroid cancers harbor at least one known genetic mutation

• Molecular analysis (BRAF, RAS, RET/PTC, PAX8-PPARγ) are specific, but not sensitive

Caveat in Management of Indeterminate Nodules

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• New gene-expression classifier test

• Used to identify low-risk thyroid nodules among cytologically indeterminate fine-needle aspirates

Advances in Management Of Indeterminate Nodules

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Management of Thyroid Nodules In Pregnant Women

• Measure TSH

• If suppressed (& persists after first trimester) wait until after pregnancy and lactation to perform RAI scan

• If normal / elevated, perform FNA – If nodule discovered early in pregnancy and + PTC

–Repeat USG and surgery may be performed before 24 wks of gestation - if substantial growth is seen

– If nodule is stable by mid-gestation OR Discovered late gestation –Delay surgery after delivery and consider Lt4 therapy - TSH goal 0.1-1

American Thyroid Association Guidelines 2009

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• Diagnostic and therapeutic approach to one or more thyroid nodules in a child

• Should be the same as it would be in an adult

• Clinical evaluation, serum TSH, US, FNA (A)

Management of Thyroid Nodules In Children

American Thyroid Association Guidelines 2009

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Role of Vitamin D in Human Health

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Vitamin D is … • Fat soluble vitamin from steroid family

• Main actions – Facilitates calcium absorption in intestinal tract – Helps maintaining serum calcium and phosphorus – Allows adequate mineralization of skeleton – Prevents

–Rickets in children –Osteomalacia in adults –Osteoporosis in elderly

– Affects muscle composition and strength

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Vitamin D Nonskeletal benefits

• May regulate skin barrier and hair

• May play a role in cancer biology

• May lower cardiovascular disease

• May control the innate and adaptive immune responses in humans

• May influence maternal-fetal health

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Searchhomeremedy.com

dermaharmony.com

evitamins.com

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Utdol.com

Pathways of Vitamin D synthesis

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Clinical Manifestations of Vitamin D Deficiency

Rickets xray.stanford.edu

Medscape.com

Osteomalacia

Looser fracture tibia

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Lab Findings

Vitamin D Deficiency Osteoporosis

Calcium ↓ or N N

Phosphorus ↓ or N N

ALP ↑ N

PTH ↑ N

24 (OH) Vit D ↓ ↓ ↓ or N

1,25 di(OH) D N or ↑ or ↓ N

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Fracture Prevention with Vit D Supplementation

Bischoff-Ferrari JAMA 2005;293:2257

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What is Sufficient Vitamin D Intake?

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Low Bone Mass, Osteoporosis and Fracture Risk Assessment

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Burden - Low Bone Mass

• Based on NHANES III data

• NOF estimates that 33.6 million Americans have low bone density at hip

NOF- 2002

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• By 2012, approximately 12 million Americans older than 50 years are expected to have osteoporosis

• One half of all postmenopausal women will have an osteoporosis-related fracture during their lifetime; 25% of these women will develop a vertebral deformity, and 15% will experience a hip fracture

• Osteoporotic fractures, particularly hip fractures, are associated with chronic pain and disability, loss of independence, decreased quality of life and increased mortality

• Although hip fractures are less common in men than in women, more than one third of men who experience a hip fracture die within 1 year

Burden - Osteoporosis

U.S. Preventive Services Task Force- 2011

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• Silent skeletal condition characterized by low bone mass and compromised bone strength predisposing to an increased risk of fracture

Osteoporosis (OP): Definition

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Fragility Fracture

• Any fracture in adults (except for face and digits) that occurs from fall from a standing height and without major trauma

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WHO Relies on BMD to Define Osteoporosis

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Kanis et. Al. JBMR 1994, 9:1137

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• Individuals with an osteoporotic fracture including a morphometric vertebral fracture have ‘clinical osteoporosis’ independent of their BMD

Take Home Message

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• Bone mineral density was originally developed to diagnose a high risk for fragility fractures in older, postmenopausal women who may have primary osteoporosis

• However, use of BMD in a young healthy premenopausal women can lead to unexpected findings of low BMD

Take Home Message

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Practitioners should not assume that all women with a low T-score have osteoporosis

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• Diseases and drugs that increase BMD and increase risk of fragility fractures

– Osteopetrosis

– Fluoride

BMD Contributes Partly To Skeletal Strength

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• Refers to structural and material composition of the bone that determine its strength

• Some contributing factors: – Micro architecture – Accumulated microscopic damage – Quality of collagen – Size of the mineral crystals – Rate of bone turn-over

Bone Quality

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FRAX WHO Fracture Risk Assessment Tool

http://www.shef.ac.uk/FRAX/

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Who to Treat?

• FDA approved medical therapies should be considered in post menopausal women and men age 50 and older with

– A hip or vertebral (clinical or morphometric) fracture

– T-score ≤ -2.5 at the femoral neck or spine after appropriate

evaluation to exclude secondary causes

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• Low bone mass (T-score between -1.0 and -2.5 at the femoral neck or spine) AND a 10-year probability of a hip fracture ≥ 3% OR a 10-year probability of a major osteoporosis-related fracture ≥ 20% based on the US-adapted WHO algorithm

• Clinician's judgment and/or patient preferences may indicate treatment for people with 10-year fracture probabilities above or below these levels

Who to Treat?

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Universal Recommendations For All Patients To Reduce Fracture Risk

• Adequate calcium intake

• Adequate vitamin D intake

• Participation in weight bearing and muscle strengthening exercise

• Avoidance of tobacco use

• Avoidance and treatment of alcoholism

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Calcium Intake : Practical Points

• Supplements are only needed if the dietary calcium is inadequate

• Aim for ~1000-1200 mg /day of total calcium

• Divided doses for supplementation of > 500 mg/day

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Calcium Intake : Practical Points

Calcium Citrate Calcium Carbonate

With Food No Yes

With Proton pump inhibitors Yes No

Elemental calcium 20% 40%

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• Brisk walking, jogging, and hiking

• Yard work such as pushing a lawnmower and heavy gardening

• Team sports, such as soccer, baseball, and basketball

• Dancing, step aerobics, and stair climbing

• Tennis and other racquet sports

• Skiing, skating, karate, and bowling

• Weight training with free weights or machines

• Consider referrals for physical and/or occupational therapy evaluation

Weight Bearing Exercise

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Pharmacological Treatment

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US FDA Approved Drugs For Post- Menopausal OP (√) and OP in Men (M)

Bisphosphonate (BP) Prevention Treatment

Alendronate

Alendronate + D √ √ (M)

Risedronate √ √ (M)

Ibandronate √ √

Zoledronic acid √ √ (M)

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Drug Safety

• Difficulty swallowing, esophageal inflammation and gastric ulcer

• Reduction of GFR

• Osteonecrosis of jaw

• Eye inflammation

• Low trauma atypical subtrochanteric and diaphyseal femoral fractures

• IV BPs – Acute phase reaction

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Prevention Treatment

Calcitonin √

Estrogen and /or Hormone Rx √

Estrogen agonist/antagonist (raloxifene) √ √

Parathyroid hormone [PTH (1, 34)] √ (M)

Denosumab √ (M)

US FDA Approved Drugs For Post- Menopausal OP (√) and OP in Men (M)

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Parathyroid Hormone : Teriparatide • Efficacy after 18 months of therapy

– Reduces risk of vertebral fractures by 65% – Reduces risk of non-vertebral fractures by 53%

• Drug administration – Anabolic 20 mcg SC – Bone loss is rapid after treatment is stopped – Alternative agents should be considered to maintain BMD

• Drug safety – Side effects: leg cramps, nausea, dizziness – Warning: Osteosarcoma rats , therefore cannot be used in

Pagets, prior radiation therapy to skeleton, bone mets, hypercalcemia, h/o skeletal malignancy

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RANK Ligand Inhibitor : Denosumab • Efficacy after 3 years of therapy

– Reduces risk of vertebral fractures by 68% – Reduces risk of hip fracture by 40% – Reduces risk of non-vertebral fractures by 20%

• Drug Administration – 60 mg SC every 6 months by health professional – Bone loss can be rapid after treatment is stopped – Alternative agents should be considered to maintain BMD

• Drug safety – Hypocalcemia – Increases risk of serious skin infections (cellulitis) and skin rash – Associated with osteonecrosis of jaw and atypical femur fractures

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• Assess adherence

• Measuring biochemical markers of bone turnover – Urine and serum NTX – Serum CTX – Bone specific alkaline phosphatase

• Serial BMD

Monitoring Effectiveness Of Treatment

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