Changes in surgical principles as a result of modern, effective, perioperative treatments

Oncology has evolved to a great extent over the last quarter of century. The significant success is multifactorial, including primary and secondary prevention, the development of diagnostics, new methods of chemo-and radiotherapy, and the integration of basic research results into practice. From the point of view of surgery, the establishing and widespread practical application of the principles of preoperative oncotherapy played a major role in this development. Between 1997 and 2005, 44 patients with gastric cancer and 102 patients with borderline resectable or irresectable esophageal cancer received perioperative treatment at the Department of Surgery of the University of Pecs. The response rate was above 50% in both groups and complete pathological remission was achieved in 3 patients with gastric cancer and 17 patients with esophageal cancer. Based on our own experience and literature data, the development of seven new principles in surgical oncology were observed as the result of a very successful preoperative oncologic treatment. The desired free resection margin was reduced to the millimeter dimension in many cancer cases. Thus so-called organ-preserving procedures were made possible. Regarding the prognosis, the stage after the treatment became determinant. Complete histopathological remission could also be achievable in patients with oligometastases. In the case of a complete remission, the "watch and wait" tactics emerged as an option. Along the preoperative treatment of resectable colorectal liver metastases, there is no need to strive for complete remission. The treatment order of the primary tumor and its metastases can be reversed. Based on the improving results of oncology treatments, a reduction in surgical activity in the treatment of cancer patients is expected.