On Wednesday, the team released a statement announcing that Smart, 51, underwent surgery Monday at University of Miami Hospital to treat the cancer and that he would resume basketball activities in two-to-three weeks.
"My sincere thanks to the medical staff at University of Miami Hospital and to the Heat medical team that steered me in the right direction very early in the process," Smart said in a team statement.
The Heat play in Brooklyn on Wednesday, their second game since Smart left for medical treatment.