DALLAS (CBS/AP) — Susan G. Komen for the Cure says it is canceling half of its 3-day charity walk next year because of a steep drop in participation levels.

The board is ending the walk in seven cities in 2014, including Boston. The 2013 3-day will still take place from July 26 – 28.

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The executive director of the Massachusetts branch says the decision had to do with fundraising struggles.

The announcement comes more than a year after the Dallas-based breast cancer organization experienced intense backlash after its decision to stop giving grants to Planned Parenthood for breast screenings was made public. The funding was restored days later.

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Komen says “economic uncertainty” has affected participation levels, which have dropped 37 percent over the past four years.

Participants must raise at least $2,300 to walk 60 miles over three days.

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The cancelled walks are in Boston, Chicago, Cleveland, Phoenix, San Francisco, Tampa Bay and Washington D.C.

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