You are evaluating a 6-year-old child with ALL on interim maintenance phase who has frequent mucositis and myelosuppression that needs frequent discontinuation of his treatment. Of the following, the MOST valuable test for this child is

You are evaluating a 6-year-old child with ALL on interim maintenance phase who has frequent mucositis and myelosuppression that needs frequent discontinuation of his treatment. Of the following, the MOST valuable test for this child is

The serum alpha-fetoprotein (AFP) level is elevated with some malignant germ cell tumors (GCTs) especially endodermal sinus tumors; it can be used as a measure of treatment response and during follow-up after completion of chemotherapy. However, it is normally elevated during infancy. At which age does AFP physiologically fall to normal adult level?

Epstein-Barr virus (EBV) infection is more likely to be associated with all the following malignancies EXCEPT

A 6-year-old child complains of bilateral thigh pain, motor weakness, and some sensory deficits of both lower limbs; he has a history of bladder dysfunction over the past 2 weeks; MRI of the spinal cord shows a mass arising from the filum terminale and conus medullaris causing some pressure effect. A CNS tumor is suspected. Which of the following tumor is MOST likely arising in such site?

Renal cell carcinoma (RCC) is rare in children, accounting for <5% of all renal tumors. All the following are true regarding RCC in children EXCEPT