I am so sorry to hear your story. Have you heard of oleander and would you be willing to try it? It can be taken with chemo and it lessens or eliminates its side effects. However, with Cisplatin it does not prevent hair loss. I am going to give you links as to the history, use, and effects of oleander. It can either be purchased from from South Africa at http://www.sutherlandiaopc.com or made into a soup. Although oleander in its raw form is highly toxic, when made into the extract it is a powerful healer and in your brother's case, if it were me, I would try it. Let me give you the links.
I also would like to point you to the following article that fights cancer in a well rounded way, covering all the bases.
A Natural Anti-Cancer Protocol If you are interested in going this route, I would invite you to the Ask Tony Isaacs Forum where you can receive more information. Tony, truly has the knowledge, as he has spent years researching this plant, cancer, and the real cause of cancer. He addresses the fight against cancer by addressing the real cause, the compromised immune system, instead of the cut/slash/burn method used by conventional medicine.
Besides his forum on Curezone, Tony runs another forum which focuses entirely on the oleander remedy. If you like, I would love for you to join. Here you will meet people using this remedy, those who have cancer, those who have won their battle, and those taking the supplement for preventative measures. You will even meet people using this remedy to heal their pets who have cancer. If you are interested I would be most happy to give you the link.
I wish you the very best and my heart goes out to you. I know this is not an easy time.