Ladies, take note! Working in night shifts can increase cancer risk

Researchers urge long-term night shift workers should have regular physical examinations and cancer screenings.

(Representational image)

New Delhi: Different professions across the globe require people to work odd, sometimes bizarre shifts.

Various studies have shown and we're sure you have felt it too, that these shifts, especially the night shift, often tend to cause an imbalance within your system and lead to health issues.

Even though some may feel comfortable with nights shifts, your health is ultimately bearing the brunt of the changes in your body-clock and lifestyle.

Many studies have associated night shifts with health conditions like obesity, obstruction in the body's ability to repair DNA damage, liver damage, and diabetes to name a few.

Now, a new study has focused primarily on women's health saying that working the night shift significantly increase their chances of cancer.

Lead author Xuelei Ma explained that because breast cancer is the most diagnosed cancer among women worldwide, most previous meta-analyses have focused on understanding the association between female night shift workers and breast cancer risk, but the conclusions have been inconsistent.

To build upon previous studies, Ma and colleagues analyzed whether long-term night shift work in women was associated with risk for nearly a dozen types of cancer. Ma and colleagues performed a meta-analysis using data from 61 articles comprising 114,628 cancer cases and 3,909,152 participants from North America, Europe, Australia, and Asia.

The articles consisted of 26 cohort studies, 24 case-control studies, and 11 nested case-control studies. These studies were analyzed for an association between long-term night shift work and risk of 11 types of cancer. A further analysis was conducted, which looked specifically at long-term night shift work and risk of six types of cancer among female nurses.

Overall, long-term night shift work among women increased the risk of cancer by 19 percent. When analyzing specific cancers, the researchers found that this population had an increased risk of skin (41 percent), breast (32 percent), and gastrointestinal cancer (18 percent) compared with women who did not perform long-term night shift work.

After stratifying the participants by location, Ma found that an increased risk of breast cancer was only found among female night shift workers in North America and Europe. "We were surprised to see the association between night shift work and breast cancer risk only among women in North America and Europe," said Ma. "It is possible that women in these locations have higher sex hormone levels, which have been positively associated with hormone-related cancers such as breast cancer."

Among female nurses alone, those who worked the night shift had an increased risk of breast (58 percent), gastrointestinal (35 percent), and lung cancer (28 percent) compared with those that did not work night shifts. Of all the occupations analyzed, nurses had the highest risk of developing breast cancer if they worked the night shift.

"Nurses that worked the night shift were of a medical background and may have been more likely to undergo screening examinations," noted Ma. "Another possible explanation for the increased cancer risk in this population may relate to the job requirements of night shift nursing, such as more intensive shifts."

The researchers also performed a dose-response meta-analysis of breast cancer studies that involved three or more levels of exposure. They found that the risk of breast cancer increased by 3.3 percent for every five years of night shift work.

"By systematically integrating a multitude of previous data, we found that night shift work was positively associated with several common cancers in women," said Ma. "The results of this research suggest the need for health protection programs for long-term female night shift workers."

"These results might help establish and implement effective measures to protect female night shifters. Long-term night shift workers should have regular physical examinations and cancer screenings." The findings have been published in Cancer Epidemiology, Biomarkers & Prevention, a journal of the American Association for Cancer Research.

(With ANI inputs)