Abstract
A review is given of the historical and current concepts of adjuvant chemo- and radiotherapy of colorectal cancer. Early studies analyzing the use of single drug regimens were followed by a second study generation investigating adjuvant chemotherapeutic combinations. 5-FU proved to be the most efficient single drug investigated and 5-FU/MeCCNU/vincristin the most efficient chemotherapeutic combination, but no significant improvement in 5-year survival rates was achieved. Clear progress was noted with the introduction of levamisol (LEV) for modulation of 5-FU. A 33% improval in the 5-year survival rate in patients with stage III colon carcinoma was documented. It was therefore recommended (NIH consensus conference 1990) that all patients with stage III colon carcinoma be treated with this regimen unless admitted to other trials of adjuvant therapy. Preoperative radiotherapy with a dosage of 35–45 Gy can lead to downstaging of rectal cancer. Nevertheless, significant improvement in patient survival has not been proved convincingly using either isolated pre- or postoperative adjuvant radiotherapy. However, combined radiochemotherapy has been shown to improve both patient survival and local tumor control compared to surgical resection alone. It is therefore recommended that all stage II and III rectal cancer patients be treated with adjuvant combined radiochemotherapy. 5-FU/MeCCNU is currently expected to be the most efficient chemotherapy in combination with radiotherapy. Early data point out that MeCCNU could possibly be omitted. Intraoperative radiotherapy (IORT) allows further dosage escalation in order to improve local tumor control without affecting radiosensitive structures. Available data are still sparse and mostly based on the treatment of advanced carcinoma. A general validation of IORT is not yet possible, but current data are promising.
Zusammenfassung
In der Arbeit werden bisherige und aktuelle Konzepte der adjuvanten Chemo- und Radiotherapie in einer Übersicht dargestellt. Nach frühen Chemotherapiestudien mit systemischem Einsatz verschiedener Einzelsubstanzen folgten Versuche, die therapeutische Effizienz durch Wirkstoffkombinationen zu steigern. 5-FU erwies sich als relativ wirkungsvollste Einzelsubstanz, 5-FU/MeCCNU/Vincristin als wirksamste Kombination. Verbesserungen der Fünfjahresüberlebensraten konnten nur vereinzelt erzielt werden. Einen deuthchen Fortschritt erbrachte die Modulation der 5-FU-Wirkung durch Levamisol (LEV). Hierdurch wurde fur Kolonkarzinome im Stadium Dukes C eine Verbesserung der Fünfjahres-überlebensrate um 33% erzielt. Basierend auf diesen Daten wird empfohlen, alle Kolonkarzinompatienten im Stadium III mit 5-FU/LEV zu behandeln, soweit sie nicht einer aktuellen Adjuvansstudie zugeführt werden können. Der Empfehlung kann his heute noch keine weitere allgemeine Richtlinie hinzugefügt werden. Beim Rektumkarzinom kann durch prdoperative Radiotherapie ein Down-Staging nach Dosen von 35-45 Gy erzielt werden. Eine signifikant positive Beeinflussung der Überlebens-prognose ist jedoch weder durch eine alleinige prä- noch postoperative adjuvante Bestrahlung überzeugend dokumentiert. Demgegenüber konnten durch kombinierte postoperative Radio-Chemo-Therapien (5-FU/MeCCNU) sowohl verbesserte Überlebensraten als auch eine verbesserte lokale Tumorkontrolle im Vergleich mit der alleinigen Resektion aufgezeigt werden. Es besteht die Empfehlung, alle Rektumkarzinompatienten im Stadium II und III einer kombinierten Radio-Chemo-Therapie unter Studienbedingungen zuzuführen. Als effektivste Chemotherapie in Verbindung mit Radiatio gilt 5-FU/MeCCNU. Interimsergebnisse deuten jedoch darauf hin, daß MeCCNU verzichtbar ist. Die intraoperative Radiatio (IORT) erlaubt eine Dosiseskalation zur Optimierung der lokalen Tumorkontrolle bei maximaler Schonung strahlensensibler Strukturen. Bisher liegen noch wenig Ergebnisse vor. Eine generelle Wertung der IORT im Rahmen adjuvanter Konzepte ist noch nicht möglich. Die bisherigen Daten sind jedoch erfolgversprechend.
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Kraus, T.W., Eble, M.J. & Raeth, U. Bisherige entwicklungen und aktueller stand der adjuvanten chemo- und radiotherapie beim kolon- und rektumkarzinom. Langenbecks Arch Chir 379, 353–357 (1994). https://doi.org/10.1007/BF00191582
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DOI: https://doi.org/10.1007/BF00191582