The first international meeting of the Polish Hyperthermia Society, PTHO, took place on 20.10.2017 and 21.10.2017 near Katowice. There were more than 140 participants from all over the world. Renowned speakers followed the call of the PTHO and contributed to the success of this event. The distributor of Celsius42, HT-Systems from Warsaw, was the main sponsor of the congress and played an important role in the success of the event.