Elevations of neutrophil-to-lymphocyte ratio and C-reactive protein over time as a precursor to anaplastic transformation of papillary thyroid carcinoma: a case report.

Background: Papillary thyroid carcinoma rarely undergoes anaplastic transformation. Some risk factors for anaplastic transformation of thyroid cancer are known, but such transformation is difficult to predict in practice. We report a case demonstrating elevations of neutrophil-to-lymphocyte ratio (NLR) and C-reactive protein (CRP) over time as a precursor to anaplastic transformation of thyroid carcinoma.

Case presentation: The patient was an 89 year-old woman with a history of chronic aortic dissection. She was referred to our department after her local doctor detected thyroid nodules. She had previously been found to have multinodular goiter and enlarged left cervical lymph nodes on computed tomography. Her chief complaint was cervical discomfort and hoarseness. Blood tests revealed: white blood cells (WBCs), 4900 /µL; CRP, 0.29 mg/dL; neutrophils, 64.4%; and lymphocytes, 25.4%. A 21 mm mass was identified in the upper left lobe. Left III (16 mm) and left VI (16 mm) lymph node were enlarged on ultrasonography. Fine-needle aspiration cytology diagnosed malignant papillary carcinoma. However, due to the advanced age and medical history of the patient, a non-surgical policy was implemented. The primary tumor grew to 4 cm in diameter by 9 months after diagnosis, and blood tests showed: WBC, 7700 /µL; CRP, 0.18 mg/dL; neutrophils, 65.3%; and lymphocytes, 22.3%. By 10 months after diagnosis, the tumor had increased rapidly in diameter to 8 cm, with blood tests showing: WBC, 6500 /µL; CRP, 1.01 mg/dL; neutrophils, 68.2%; and lymphocytes, 19.3%. Anaplastic transformation of papillary thyroid carcinoma was diagnosed, and the patient was placed on treatment under a policy of best supportive care. Multiple lung metastases appeared 11 months after diagnosis, and blood test results showed: WBC, 13,300 /μL; CRP, 11.28 mg/dL; neutrophils, 93.6%; and lymphocytes, 2.3%. Unfortunately, the patient died of disease progression 63 days after identification of undifferentiated metastasis.

Conclusions: Chances to see the natural history of anaplastic transformation of thyroid cancer are rare. Elevations in NLR and CRP over time may be precursors to anaplastic transformation.