BOSTON --

In a Jan. 3 story about a test developed by Massachusetts General Hospital to find cancer cells in blood, The Associated Press erroneously described the technology that will go through more study and development.

The initial version of the test used a microchip with tiny posts to capture the cells. A second, updated version uses a herringbone design instead of posts. Four cancer centers will do tests this year using that new design with a grant from the Stand Up to Cancer telethon. Johnson & Johnson has joined with Mass General to develop a third-generation test with a different technology aimed at mass production.

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