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FILE - In a Sunday, Aug. 23, 2015 file photo, former President Jimmy Carter teaches Sunday School class at Maranatha Baptist Church in his hometown, in Plains, Ga. Former President Carter said Sunday, Dec. 6, 2015, that no cancer was detected in his latest scan. (AP Photo/David Goldman, File
FILE - In a Sunday, Aug. 23, 2015 file photo, former President Jimmy Carter teaches Sunday School class at Maranatha Baptist Church in his hometown, in Plains, Ga. Former President Carter said Sunday, Dec. 6, 2015, that no cancer was detected in his latest scan. (AP Photo/David Goldman, File

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    Jimmy Carter announces he's cancer free

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Jimmy Carter announces he's cancer free

Fmr. president Carter says there are no signs of cancer after his melanoma diagnosis 4 months ago. CNN's Sanjay Gupta explains whether it's a medical miracle or science.

Jimmy Carter announces he's cancer free

Fmr. president Carter says there are no signs of cancer after his melanoma diagnosis 4 months ago. CNN's Sanjay Gupta explains whether it's a medical miracle or science.