The eligibility criteria for pursuing a Ph.D. (Doctor of Philosophy) degree at Rajiv Gandhi Cancer Institute & Research Centre in India require applicants to have a Master's degree in a relevant field, such as Life Sciences, Biotechnology, Medicine, or any other allied discipline. Additionally, candidates must have obtained their Master's degree from a recognized university or institution with a minimum aggregate score of 55%. Furthermore, applicants must have qualified in a national-level entrance examination, such as UGC-NET, CSIR-NET, or GATE, or any other equivalent examination accepted by the institute. The selection process may also involve a personal interview or written test to assess the candidate's research aptitude and subject knowledge.