Answer
Antiprotons, the antimatter counterparts of protons, play a pivotal role in modern cancer treatment, particularly in a technique known as proton therapy. In proton therapy, a beam of high-energy protons is precisely directed at cancerous tumors, minimizing damage to surrounding healthy tissues. By using antiprotons to neutralize the protons in the beam, the remaining protons can be focused more precisely, enhancing the accuracy and effectiveness of the treatment.