| Dr | Thais | Oliveira | UFPR | Tumour Immunology | Brazil | Best Researcher Award |
| Prof Dr | Vani Xavier | Oliveira Junior | Universidade Federal do ABC / UFABC | Pharmaco-Oncology | Brazil | Best Researcher Award |
| Dr | Eliane Gouvêa de | Oliveira-Barros | Federal University of Rio de Janeiro and Federal University of Juiz de Fora | Cancer Cell Biology | Brazil | Best Researcher Award |
| Mr | Christopher | Olowosoke | Federal University of Technology Akure | Targeted Cancer Therapy | Nigeria | Best Researcher Award |
| Prof Dr | Samuel | Oluwafemi | University of Johannesburg | Targeted Cancer Therapy | South Africa | Best Researcher Award |
| Dr | Andrew | Omame | Federal University of Technology Owerri | Cancer Science | Nigeria | Young Scientist Award |
| Prof | Ola | Omran | Qassim University | Cancer Science | Saudi Arabia | Best Researcher Award |
| Dr | Mervat | Omran | National Cancer Institute, Cairo University | Cancer Cell Biology | Egypt | Women Researcher Award |
| Prof | Ola | Omran | College of Medicine- Qassim University | Cancer Biomarkers | Saudi Arabia | Best Researcher Award |
| Assoc Prof Dr | CHERN EIN | OON | Institute for Research in Molecular Medicine | Oncology Therapeutics and Novel Approaches | Malaysia | Best Research Award |
| Prof | Stina | Oredsson | Lund University | Cancer Cell Biology | Sweden | Best Research Award |
| Dr | Clement | OSEI AKOTO | Kwame Nkrumah University of Science and Technology | Cancer Science | Ghana | Best Researcher Award |
| Assoc Prof Dr | Hamid | Osman | Consortium Saudi Arabia - Al Taif University | Cancer Science | Saudi Arabia | Best Researcher Award |
| Dr | Abdoul Karim | OUATTARA | CERBA/LABIOGENE | Pharmaco-Oncology | Burkina Faso | Best Researcher Award |
| Prof. | Wenhao | Ouyang | Sun Yat-Sen Memorial Hospital | Tumor Immunology | China | Best Researcher Award |
| Prof Dr | Camila | Paccola | Federal University of Sao Paulo | Others | Brazil | Best Research Award |
| Prof | Paulo | Pacola | Hospital Universitário Julio Muller | carcinoma | Brazil | Best Researcher Award |
| Prof | Elisabetta | Panza | Department of Pharmacy | Cancer Cell Biology | Italy | Best Researcher Award |
| Prof | Evangelos | Paraskevaidis | University of Ioannina | Oncology Management and Prevention | Greece | Best Researcher Award |
| Prof | Hye Yun | Park | Samsung Medical Center | Oncology Therapy | South Korea | Best Researcher Award |