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Kevin S. Scher, Juan-Sebastian Saldivar, Michael Fishbein, Alberto Marchevsky, and Karen L. Reckamp

This case report describes the rare occurrence of a T790M resistance mutation found in a central nervous system (CNS) parenchymal metastasis. A concomitant squamous histology transformation in a lung non-T790M-resistant metastasis is also described. The authors hypothesize that this CNS resistance and histology transformation may have resulted from intermittent use of erlotinib treatment. This case report emphasizes the complexities of using erlotinib in the induction setting.

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Suwicha Limvorasak, Hilary Teaford, Crystal Leung Dobbs, Kyung Kim, Marcio A. Diniz, Andre Rogatko, Edwin M. Posadas, Kevin S. Scher, Vipul Patel, Bruce Vinson, Leanne Sakamoto, Rita Shane, Robert A. Figlin, and Karen L. Reckamp