the efficacy of prayer

Wife Teresa - on 'chemo-holiday' since November, recently had CT scan & follow-up oncologist appt. The 'chemo-holiday' has been great - Teresa feels sort of normal, has energy, wants to do things (and her hair is growing back - a psychological lift!).
We figured the nasties would also be enjoying the chemo-holiday...
... but, no! - CT scan reveals liver is healing, no new lesions, and existing lesions shrinking.

With no other explanation available, Teresa credits prayers - those offered by many others.

Now, I'm a confessing agnostic, but I never turn down offers of prayer: can't hurt, might help, doesn't cost anything.

So... I'm inclined to agree with Teresa's assessment.
Thanks for the prayers!