@louisejewell Let me see if I'm understanding you correctly: the Signatera value (which is a lab test some providers use in conjunction with other tests as an early marker of metastasis) had risen just before imaging showed possible mets in your chest? But before switching to cetuximab - a stronger chemotherapeutic agent - everything returned to normal range and you've not had any further squamous cell lesions; is that correct?

That's great that you can proceed with increased dosage and less commuting. Keep us posted on how the surveillance goes from here out!