Oh Dan, as others have already said, saying I’ll pray for you both seems too little but when one can’t be physically present it becomes a full trust of a God we believe is the only One who can bring a miracle of healing.
May God hold your hand through this painful process. May your wife receive favor in the form of the best oncologist team. May you both be surrounded with love, gratitude and grace for each other and the precious lives you have built together. May you both know that you are loved. In God’s miraculous power, Amen.