Anyone with Hepatocellular Carcinoma (Liver Cancer) want to share?

Hi! My dad, who is 78, has already been treated for Hepatitis C (almost 20 years ago) and was diagnosed with this huge mass/tumor in Feb/18 after abdomen pain and loss of appetite. He was referred to a hepatologist who suggested the hepatectomy. The surgery was successful, on March,16th and the mass removed was around 13 pounds. At the end of the surgery, no cancerous cells were found at the biopsy. The doctor recommended another consultation after 3 months.

Before this, in the beginning of this month (about to complete 2 months os surgery) my dad made an appointment to an oncologist (just to check). He asked for some blood tests and triphasic MRI. In the next days my dad started feeling the symptons again (loss of appetite, weakness, fever, shivering, abdominal pains) and returned to the oncologist to show the results. The oncologist said the tumor had came back (multiple small nodules) and that he would not recommend another surgery (because tumor would come back again) and that he was not eligiible for transplant because of his age.

After all this, the oncologist recommended the treatment with Nexavar (Sorafenib) and my dad will start it this week.

I'd like to know how to get Mayo Clinic's doctors second opinion since we're in Brazil and there may be another approachs to this abroad.
Also, it would be great if someone in a similar situation could share info here. I`m really worried because my dad is 78, is weak and depressive because of this, and we don't know how aggressive and effective is Nexavar.

Thanks,
Tina