Disparity driven by gender differences in cancer incidence.
Cancer survival largely similar between men and women.
Research needed to understand gender disparities in cancer incidence.
PHILADELPHIA - Overall cancer mortality rates are higher for men than women in the United States, according to a study published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research.
Michael B. Cook, Ph.D., an investigator in the division of cancer epidemiology and genetics at the National Cancer Institute, and colleagues used U.S. vital rates and survival data from the SEER database for 36 cancers by gender and age. They assessed whether cancer mortality rates and cancer survival differed by gender.
"Men are more likely to die from cancer than women," said Cook. "We found this to be true for a majority of specific types of cancer."
Results showed that the cancers that had the highest male-to-female mortality rate ratios were: lip cancer (where 5.51 men died compared to 1 female); larynx (5.37-to-1); hypopharynx (4.47-to-1); esophagus (4.08-to-1); and urinary bladder (3.36-to-1). Cancers with the highest mortality rates also showed greater risk of death in men than women: lung and bronchus (2.31-to-1); colon and rectum (1.42-to-1); pancreas (1.37-to-1); leukemia (1.75-to-1); and liver and intrahepatic bile duct (2.23-to-1).
In their analysis of five-year cancer survival, the researchers adjusted for age, year of diagnosis and tumor stage and grade, when this information was available. Cook and his team found that a persons gender did not play a major role in cancer survival.
For many cancers, men have poorer survival than women but the differences are slight. It is difficult to assign any singular root cause, but influences include differences in behavior of the tumor, cancer screening among people without symptoms, presence of other illnesses and health care seeking behaviors.
"Our research suggests that the main factor driving the greater frequency of cancer deaths in men is the greater frequency of cancer diagnosis, rather than poorer survival once the cancer occurs," said Cook. "If we can identify the causes of these gender differences in cancer incidence then we can take preventative actions to reduce the cancer burden in both men and women."
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The mission of the American Association for Cancer Research is to prevent and cure cancer. Founded in 1907, the AACR is the worlds oldest and largest professional organization dedicated to advancing cancer research. The membership includes 33,000 basic, translational and clinical researchers; health care professionals; and cancer survivors and advocates in the United States and more than 90 other countries. The AACR marshals the full spectrum of expertise from the cancer community to accelerate progress in the prevention, diagnosis and treatment of cancer through high quality scientific and educational programs. It funds innovative, meritorious research grants, research fellowships and career development awards. The AACR Annual Meeting attracts more than 18,000 participants who share the latest discoveries and developments in the field. Special conferences throughout the year present novel data across a wide variety of topics in cancer research, treatment and patient care. Including Cancer Discovery, the AACR publishes seven major peer-reviewed journals: Cancer Research; Clinical Cancer Research; Molecular Cancer Therapeutics; Molecular Cancer Research; Cancer Epidemiology, Biomarkers & Prevention; and Cancer Prevention Research. AACR journals represented 20 percent of the market share of total citations in 2009. The AACR also publishes CR, a magazine for cancer survivors and their families, patient advocates, physicians and scientists.