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In accordance with Cancer's editorial policy and internationally recognized guidelines, this serves as a notice to readers that the articles Wronski M. Resection of brain metastases from colorectal cancer in 73 patients. Cancer 1999,85,1677 and Wronski M, Arbit E, McCormick B. Surgical resection of brain metastases from breast cancer in 70 patients. Cancer 1997,80,1746 present research results previously published in Polish-language journals as Wronski M. Wyniki leczenia chirurgicznego przerzutów raka jelita grubego do mózgu. Nowotwory 1996,46,520 and Wronski M. Wyniki chirurgicznego leczenia przerzutów raka sutka do mózgu. Polski Przeglad Chirurgiczny 1996,68,1006, respectively. This information was not disclosed to the editorial office during the submission and peer review process for the Cancer papers. The lead author has acknowledged this breach of publication ethics, which violated Cancer's editorial policies as set forth in our instructions to authors, and apologized to the Editor-in-Chief. The lead author's detailed explanation of these events and apology, along with the Editor-in-Chief's response, is published in this same issue.