Zusammenfassung
Die chirurgische Therapie stellt beim Kolonkarzinom nach wie vor die Therapie der Wahl dar. Zentrales Element einer kurativ intendierten Therapie ist hierbei für alle Kolonkarzinome – mit Ausnahme von pT1-Karzinomen in der Low-risk-Situation – die En-bloc-Resektion des tumortragenden Kolonsegmentes mit einer systematischen Lymphadenektomie sowie der zentralen Ligatur der versorgenden Stammgefäße. Minimal-invasive Operationstechniken haben die postoperativen, kurzfristigen Ergebnisse verbessert. Das Konzept der kompletten mesokolischen Exzision (CME) zielt in Analogie zur totalen mesorektalen Exzision (TME) beim Rektumkarzinom auf eine maximale Reduktion der Lokalrezidivrate ab. Es umfasst zum einen die Wahrung der Integrität des Mesokolons durch eine exakte Präparation entlang der embryonalen Schichten und somit eine Schonung der beiden mesokolischen Faszienblätter, um eine mögliche Tumorzelldissemination zu vermeiden. Zum anderen wird durch die zentrale Ligatur der segmentalen Gefäße mit erweiterter Dissektion der D3-Lymphknotenstationen die Anzahl der resezierten Lymphknoten erhöht. Wenngleich eine adäquate CME mit einer geringeren Lokalrezidivrate assoziiert ist, so ist zum gegenwärtigen Zeitpunkt die Evidenz hinsichtlich onkologischer Langzeitergebnisse noch unklar. Darüber hinaus ist nicht gesichert, ob alle Tumorstadien von einer CME profitieren. Unter dem Aspekt einer möglicherweise erhöhten perioperativen Morbidität durch die Erweiterung der Lymphadenektomie ist eine Risiko-Nutzen-Abwägung der CME zu diskutieren.
Abstract
Surgery is still the therapy of choice for colon cancer. The central element of a curative therapy for all types of colon cancer—with the exception of pT1 tumors in the low-risk situation—is the en bloc resection of the tumor-bearing colon segment with a systematic lymphadenectomy and the central ligature of the corresponding main vessels. Minimally invasive surgical techniques have improved postoperative, short-term outcomes. In analogy to total mesorectal excision (TME) in rectal cancer, the concept of complete mesocolic excision (CME) aims to achieve a maximum reduction in the local recurrence rate. On the one hand, it includes preserving the integrity of the mesocolon through precise dissection along the embryonic layers and thus protecting the two mesocolic fascia layers in order to avoid possible tumor cell dissemination. On the other hand, the number of resected lymph nodes is increased by the central ligature of the segmental vessels with extended dissection of the D3 lymph node stations. Although adequate CME is associated with a lower local recurrence rate, the evidence regarding long-term oncological outcomes is still unclear. In addition, it is not certain whether all tumor stages benefit from CME. A risk–benefit analysis of CME should be discussed under the aspect of a possibly increased perioperative morbidity with this demanding concept.
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Holmer, C. Ausmaß und Technik der chirurgischen Resektion beim Kolonkarzinom. coloproctology 44, 149–155 (2022). https://doi.org/10.1007/s00053-022-00605-0
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DOI: https://doi.org/10.1007/s00053-022-00605-0