Colorectal cancer: a tale of two sides or a continuum?

Colorectal cancer: a tale of two sides or a continuum?
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DOI:
10.1136/gutjnl-2012-302014
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发表时间:
2012-06
期刊:
Gut
影响因子:
24.5
通讯作者:
Ogino S
Ogino S
中科院分区:
医学1区
文献类型:
--
作者:
Yamauchi M;Lochhead P;Morikawa T;Huttenhower C;Chan AT;Giovannucci E;Fuchs C;Ogino S

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In the 1980s, epidemiological and molecular data suggested that cancers arising at different subsites may be biologically disparate, implying different cancer aetiologies or evolutions. These observations prompted the suggestion that the proximal and distal colon should be considered separately in aetiological studies, with the splenic flexure as a demarcation point. 3 This dichotomisation has been propagated by subsequent clinical, translational and epidemiological studies, 4e10 while evolving molecular data have galvanised and lent further support to the two-colon concept. 11e14 It remains uncertain, however, whether the splenic flexure represents a genuine or arbitrary divide in the aetiological spectrum of colon cancers. Notably, our recent study, 15 demonstrating that the frequencies of key tumour molecular features change gradually along the length of the colon (rather than abruptly at the splenic flexure), challenges the current two-colon paradigm. The aim of this article is to review data relevant to the current concept of distinct molecular pathogeneses for proximal versus distal colon cancers, to describe the impact of our recent findings and to discuss the implications for future research.
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