Bone scintigraphy in nasopharyngeal carcinoma

Area of Science:

• Oncology
• Nuclear Medicine
• Radiology

Background:

• Nasopharyngeal carcinoma (NPC) is a malignancy with a propensity for bone metastasis.
• Early detection of bone metastases is crucial for patient management and prognosis.

Purpose of the Study:

• To evaluate the incidence and pattern of bone metastases in nasopharyngeal carcinoma (NPC).
• To assess the utility of bone scintigraphy in diagnosing bone metastases in NPC patients.

Main Methods:

• Bone scintigraphy using 99Tcm methylenediphosphonate (MDP) or dihydroxypropanediphosphonate (DPD) was performed on 143 newly diagnosed NPC patients (Group 1) and 162 patients during follow-up (Group 2).
• Clinical data including tumor stage (T) and nodal stage (N) were analyzed in correlation with bone scan findings.

Main Results:

• Twenty-three percent (33/143) of newly diagnosed NPC patients had bone metastases.
• Bone metastases were most common in the spine, ribs, pelvis, and lower limbs.
• A significant association was found between bone metastases and advanced nodal stage (N1-N3), but not with the UICC T staging.

Conclusions:

• Bone scintigraphy is a valuable tool for detecting bone metastases in NPC.
• Bone metastases are a frequent complication of NPC, particularly in patients with advanced nodal disease.
• Current UICC T staging may be inadequate for assessing the risk of bone metastases in NPC.