"How to differentiate?"
"Do a PET-CT to check metabolic activity. If it's false progression, metabolism won't be high; if it's true progression..." Yang Ping trailed off.
Wang Jianjun's face turned pale, as the odds were fifty-fifty for a new lesion.
Seeing the despair in the couple's eyes, Yang Ping suddenly suggested, "There's a simpler method for rapid differentiation, cerebrospinal fluid biopsy."
"Cerebrospinal fluid?"
"Yes, by performing a lumbar puncture to obtain a small amount of cerebrospinal fluid, we can check for tumor-derived gene mutations and immune markers," Yang Ping explained. "If it's false progression, there will be many immune activation signals in the cerebrospinal fluid; if true progression, there will be tumor-related mutations."
"Then...when can we do it?"
"We can do it right now."
