Am­gen qui­et­ly kills an obe­si­ty pro­gram, cast­ing bleak fu­ture for once-promis­ing tar­get

Five years ago, in a span of less than two months, four drug com­pa­nies si­mul­ta­ne­ous­ly con­verged on a sin­gle new way to treat obe­si­ty.

It was a cu­ri­ous sci­en­tif­ic jour­ney. More than a decade pri­or, an Aus­tralian im­mu­nol­o­gist named Sam Bre­it had shown that can­cer pa­tients who lose a lot of weight of­ten have high lev­els of a pro­tein called GDF-15. Fur­ther stud­ies showed it was causative: Knock out the gene in mice, and the same tu­mors don’t in­duce weight loss.

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