As someone who also received a cancer diagnosis this year (in my case, stage IV pancreatic cancer), I understand and share your pain regarding how unfair this situation is, especially in the case of a young man who has just begun his life's journey.
However, as someone who, in the words of his oncologist, has seen his progress in terms of "...not good results, not excellent results, but awesome results..." I have also seen first hand that the power of prayer works! I will join with the other members here in praying for your family, and am confident that these prayers, too, will be answered...