Abstract
This article addresses the current status of quantitative imaging as a surrogate biomarker for the assessment of tumor response to therapy with non-small cell lung cancer as an example. In addition, the article discusses the limitations of conventional response criteria in the new era of molecular-targeted agents for cancer treatment; the increasing need for more accurate and early response-assessment methods, particularly for volumetric CT; new tumor-specific radiotracers and molecular imaging technologies; and the future applications of molecular imaging with PET for studying various features of cancer metabolism, endocrine status, hypoxia, and oncofetal and differentiation antigens.
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