Researchers on Wednesday reported the largest-ever one-year decline in the U.S. cancer death rate, a drop they credited to advances in lung-tumor treatments.

The overall cancer death rate has been falling about 1.5% a year since 1991. It fell 2.2% from 2016 to 2017, according to the new American Cancer Society report. That’s the largest drop ever seen in national cancer statistics going back to 1930, said Rebecca Siegel, the lead author.

“It’s absolutely driven by lung cancer,” which accounts for about a quarter of all cancer deaths, she said. Take lung cancer out of the mix, and the 2017 rate drop is 1.4%, she added.

Government researchers previously reported a slightly lower drop in the cancer death rate for the same period. But the Cancer Society calculates the death rate differently, and on Wednesday said the decline was larger — and record-setting.

Most lung cancer cases are tied to smoking, and decades of declining smoking rates led to falling rates of lung cancer illnesses and deaths.

But the drop in deaths seems to have been accelerated by recent lung cancer treatment advances, Siegel said.

Experts mainly credit advances in treatment. Topping the list are refinements in surgery, better diagnostic scanning, and more precise use of radiation.

Researchers on Wednesday reported the largest-ever one-year decline in the U.S. cancer death rate, a drop they credited to advances in lung-tumor treatments.

The overall cancer death rate has been falling about 1.5% a year since 1991. It fell 2.2% from 2016 to 2017, according to the new American Cancer Society report. That’s the largest drop ever seen in national cancer statistics going back to 1930, said Rebecca Siegel, the lead author.

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“It’s absolutely driven by lung cancer,” which accounts for about a quarter of all cancer deaths, she said. Take lung cancer out of the mix, and the 2017 rate drop is 1.4%, she added.

Government researchers previously reported a slightly lower drop in the cancer death rate for the same period. But the Cancer Society calculates the death rate differently, and on Wednesday said the decline was larger — and record-setting.

Most lung cancer cases are tied to smoking, and decades of declining smoking rates led to falling rates of lung cancer illnesses and deaths.

But the drop in deaths seems to have been accelerated by recent lung cancer treatment advances, Siegel said.

Experts mainly credit advances in treatment. Topping the list are refinements in surgery, better diagnostic scanning, and more precise use of radiation.

(AP)