A new case report describes two children with suprasellar mixed germ cell tumors, a type of brain tumor. They received chemotherapy with etoposide, cisplatin, and ifosfamide. During treatment, their blood tumor markers, alpha-fetoprotein (AFP) and beta-human chorionic gonadotropin (β-HCG), dropped dramatically. However, imaging showed that the tumors were actually getting bigger. This surprising pattern is known as intracranial growing teratoma syndrome (iGTS).
When the tumors were surgically removed, they turned out to be mature teratomas, which are non-cancerous but can still cause problems by pressing on the brain. Both children experienced permanent hypothalamic-pituitary dysfunction, a side effect of the tumor or its treatment. This condition can affect hormones, growth, and other vital functions.
The main lesson from this report is that falling tumor markers are not always a sign that the tumor is shrinking. In fact, if symptoms worsen or the tumor grows, doctors should consider early surgery to relieve pressure on the brain. This is a rare situation, and the report is based on only two cases, so it may not apply to everyone. Still, it highlights an important clinical clue for doctors treating children with these tumors.
For families and patients, this report underscores the need for careful monitoring during treatment. If you or a loved one are undergoing treatment for a brain tumor, always discuss any new or worsening symptoms with your healthcare team.
