Your role in early diagnosis & Tx of metastatic bone disease

The Journal of Family Practice. 2020 September;69(7):E1-E7 | 10.12788/jfp.0052

September 10, 2020|Family Medicine

Daniel Reinhardt, MD;Brant Ansley, MSPAS;Humza Mian, BA;Jacob Brubacher, MD;Kyle Sweeney, MD

This approach to the work-up and diagnosis will help you to ensure prompt treatment while maximizing your patient’s quality of life.

PRACTICE RECOMMENDATIONS

› Initiate appropriate lab and imaging work-ups for any patient without known malignancy who has a suspicious bone lesion. C

› Prescribe protected weight-bearing for the patient who has a painful bone lesion, and refer promptly to an orthopedic surgeon to prevent pathologic fracture. C

Strength of recommendation (SOR)

A Good-quality patient-oriented evidence
B Inconsistent or limited-quality patient-oriented evidence
C Consensus, usual practice, opinion, disease-oriented evidence, case series

Appropriate laboratory evaluation entails a complete blood count; metabolic panel that includes serum calcium and phosphorus, vitamin D, alkaline phosphatase, thyroid-stimulating hormone, and parathyroid hormone; and serum protein electrophoresis to rule out multiple myeloma.^7,11 Tumor markers are useful to monitor a patient’s response to cancer treatment or to determine recurrence, but they play only a limited role in the initial work-up of an unknown bone tumor.²⁸

Further imaging. A CT scan with intravenous contrast of the chest, abdomen, and pelvis is done to screen for visceral malignancy; however, 15% of bone lesions in patients with an unknown primary lesion never have a source identified.²⁹ Bone scans can be useful in identifying the extent of a single lesion seen on plain films and to assess for additional asymptomatic lesions. Additional imaging—eg, CT or MRI of the lesion, or positron emission tomography (PET)—can be left to the discretion of the oncologist or surgeon.

Order plain radiographs if you suspect a bone lesion. Request at least 2 views of the area that include the entire bone with the joints above and below.

CT scans have significantly higher sensitivity than radiographs and offer better visualization of bone quality, bone destruction, and soft-tissue extension.³⁰ MRI can be used to assess changes in bone marrow and soft-tissue involvement. PET scans, which detect tumors by quantifying metabolic activity, remain controversial. PET is superior to bone scans in detecting bone metastases from lung and breast cancers, but worse in renal and prostate cancers due to slow growth of metastases.^31-33

Caveat. Do not assume that a bone lesion is metastatic. Delayed diagnosis of a primary bone tumor can lead to significant changes in clinical course and patient outcome.³⁴ If any doubt exists as to the type of lesion, arrange for a biopsy using proper technique and delay bone fixation until a histologic diagnosis is complete.³⁵ Biopsy may be performed via image-guided fine-needle aspiration, core biopsy, or open incisional biopsy.

Treatment options

Metastatic bone disease is typically managed nonsurgically with radiation, chemo- or immunotherapies, hormone suppression, bone-modifying agents, or ablation.³⁶ An overview of the cancer treatment guidelines for bone metastasis from the 2017 National Comprehensive Cancer Network is shown in TABLE 2.³⁶

Continue to: Radiotherapy

References

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