Dr Nikolaos Diamantis

Dr Diamantis is thorough, caring, friendly and extremely good at tailoring explanations (of scans, treatments etc) to my level of interest and understanding. He is generous with his limited time and very thoughtful when it comes to planning treatment around other life events.

Dr Diamantis was the perfect choice for us. We wanted a second opinion and he listened well, was very knowledgable and gave clear answers and direction. He had a very human approach and we felt comfortable to ask everything we needed. We left the consultation more confident about the upcoming treatement and the decisions we made.

Very nice and excellent doctor. Explains everything clearly.

Dr. Diamantis has been knowledgeable, kind, and very understanding throughout my care. He listens carefully, answers all my questions, and makes sure I feel heard. Having a clear plan at each stage has been incredibly reassuring.

The service was accurate and professional on all levels

Dr Diamantis is always professional , efficient and very approachable, his patients appreciate his help and input.

Excellent . I have been Dr Nikolaos Diamantis's Oncology patient since my Stage 4 colorectal cancer was discovered in 2022. His excellent clinical knowledge enables me to continue to actively enjoy my life. He is mindful of the effects of chemotherapy and surgery, adjusting treatment to improve my experience and optimise the outcome. He is vigilant and proactive, monitoring my condition closely. He has always researched my treatment options ahead of our consultations so that I am offered potential solutions and fully understand the medical thinking behind them. This puts me at the centre of the decision-making process. He is very open to questions and, if he doesn't know something immediately, he will seek out an answer. He has always pushed to get me access to the treatments that I need. Dr. Diamantis is London-based and has excellent relationships with other skilled medical and surgical specialists, many at the top of their field, so I have had the benefit of a wide range of cutting-edge techniques and clinical expertise. I am very happy to recommend Dr. Diamantis, I trust him and I feel safe in his hands.

We are incredibly grateful to Dr Diamantis and his wonderful team. Dr Diamantis is compassionate, approachable, and always takes the time to clearly explain every procedure and treatment plan, making sure we fully understand and feel reassured. His PA, Pamela, is exceptional — highly efficient, organised, and always ready to help with appointments, treatments, blood tests, and PICC line care. Nothing is ever too much trouble. During a very difficult time for our family, their care, support, and kindness have made everything feel much more manageable. We cannot thank them enough.

Dr Diamantis is a compassionate oncologist who treats you as a person and not just a patient. He works with you to find a way forward and will always take your views into consideration. Dr Diamantis is always calm and collected and you feel like you're in safe hands. He is creative and thinks outside of the box. He genuinely wants to help people and this shines through in his practice.

Dr Diamantis is fantastic. I have run into many of his other patients and they all concur. He is clear and compassionate and takes care to tailor the information he provides to the needs of his patients. I have always felt very involved in the decision making about my treatment, clear on the side effects, and is evident that Dr Diamantis cares a great deal about my quality of life while in my treatment.