Low SUV but tumor size unchanged after chemo – is this normal?
My mom (65) is undergoing treatment for ovarian cancer and has completed 3 cycles of chemo. Her recent PET scan shows a big drop in SUV (around 12 → ~1.4), but the tumor size hasn’t reduced much(it's still 10×16×10 cm).
CA-125 has also dropped significantly (2600 → 48) in 3 months, and she currently has no prior symptoms(no bloating, appetite loss, constipation, abdomen pain).
Just trying to understand:
Is it normal for tumor size to remain similar even when SUV drops so much?
Does this indicate mostly inactive/dead tissue?
What should we expect next (especially regarding surgery outcomes)?
Would appreciate any insights from those with similar experiences 🙏