US cancer death rates have fallen 25 percent since 1991

Fewer Americans are dying from the second biggest killer in the U.S.: cancer.

New numbers from the American Cancer Society show from 1991 to 2014, the cancer death rate has dropped by a quarter.

That means there were about 2 million fewer cancer deaths than expected if cancer death rates stayed at their peak.

The big overall drop is fueled by decreasing death rates from four major types of cancer: lung, breast, colorectal and prostate.

Related: See notable people who have beaten cancer:

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Notable people who have beaten cancer
Musician Sheryl Crow arrives at the Vanity Fair Oscar Party in Beverly Hills, California February 28, 2016. REUTERS/Danny Moloshok
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Actress Christina Applegate poses at the UK Premiere of the film Anchorman 2 in Leicester Square, London, December 11, 2013. REUTERS/Andrew Winning (BRITAIN - Tags: ENTERTAINMENT)
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Actor Michael C. Hall arrives at the 2011 Vanity Fair Oscar party in West Hollywood, California February 27, 2011. REUTERS/Danny Moloshok (UNITED STATES - Tags: ENTERTAINMENT) (OSCARS-PARTY)
Singer Kylie Minogue performs at the 25th Annual GLAAD Media Awards at the Waldorf Astoria in New York, May 3, 2014. REUTERS/Eduardo Munoz (UNITED STATES - Tags: ENTERTAINMENT)
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SEE MORE: Life Expectancy In The US Has Dropped For The First Time In Decades

The American Cancer Society's report says those encouraging numbers are because of better screening, better treatment and fewer smokers.

The society's chief medical officer said in a statement, "The continuing drops in the cancer death rate are a powerful sign of the potential we have to reduce cancer's deadly toll."

But there's still a long way to go. The organization estimates this year, the U.S. will have nearly 1.7 million new cancer cases and over 600,000 cancer deaths.

Related: Learn about breast cancer warning signs:

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Warning signs and risk factors of breast cancer
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Warning signs and risk factors of breast cancer

Risk factors of breast cancer: obesity

(Photo via Getty Images)

Risk factors of breast cancer: lack of exercise

(Photo by Martin Barraud, Getty Images)

Risk factors of breast cancer: alcohol use

(Photo via Ron Chapple Stock, Getty Images)

Risk factors of breast cancer: an unhealthy diet

(Photo by Dean Belcher, Getty Images)

Risk factors of breast cancer: smoking

(Photo via Getty Images)

Common signs of breast cancer: a breast mass that is hard and/or irregular 

(Photo via Getty Images)

Common signs of breast cancer: changes in the skin of the breast such as puckering, irritation, scaling, dimpling, redness or thickening

(Photo via Getty Images)

Common signs of breast cancer: swelling of all or part of the breast, even with no specific lump

(Photo via Getty Images)

Common signs of breast cancer: enlargement or swelling of the lymph nodes in the armpit area

(Photo via Getty Images)

Common signs of breast cancer: nipple discharge, that is not breast milk

(Photo via Ron Chapple Stock, Getty Images)

Common signs of breast cancer: nipple retraction, which looks like a turning inward of the nipple

(Photo via Getty Images)

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