Cancer

Objectives:
Heated debates have been on-going about tea consumption and the incidence of cancer, especially in head and neck cancer types. Therefore, this review article (meta-analysis) has been conducted.

Does habitual tea consumption reduce risk of nasopharyngeal cancer?

Study design:
This review article included 6 articles.

Objectives:
The association between vitamin C intake and breast cancer is unclear. Therefore, this review article (meta-analysis) has been conducted.

Does a higher vitamin C intake reduce risk of breast cancer incidence, mortality and recurrence?

Study design:
This review article included 24 cohort studies and 30 case-control studies.

Objectives:
Epidemiological studies showing the correlation between folate (folic acid) and the breast cancer risk have revealed inconsistent results. Therefore, this review article (meta-analysis) has been conducted.

Objectives:
Data on the association of nut intake with risk of cancer and its mortality are conflicting. Although previous meta-analyses summarized available findings in this regard, some limitations may distort their findings. Moreover, none of these meta-analyses examined the dose-response associations of total nut intake with the risk of specific cancers as well as associations between specific types of nuts and cancer mortality. Therefore, this review article (meta-analysis) has been conducted.

Objetivos:
¿Reduce el consumo de frutas y verduras el riesgo de cáncer del conducto biliar?

Diseño del estudio:
Este artículo de revisión incluyó 14 estudios.

Objectives:
Does dietary acrylamide intake increase risk of breast, endometrial and ovarian cancer?

Study design:
This review article included 14 prospective cohort studies.

Results and conclusions:
The investigators found no significant association between dietary acrylamide intake and the risk of breast [RR = 0.95, 95% CI = 0.90 to 1.01], endometrial [RR = 1.03, 95% CI = 0.89 to 1.19] and ovarian cancers [RR = 1.02, 95% CI = 0.84 to 1.24].

Objectives:
Although several epidemiological studies have investigated associations between poultry and fish consumption and pancreatic cancer (PC) risk, these findings have been inconsistent. Therefore, this review article has been conducted.

Objectives:
Does a low selenium level in human tissues increase the risk of breast cancer?

Study design:
This review article included 18 case-control studies with 3,374 women diagnosed with breast cancer (case group) and 3,582 healthy controls (women without breast cancer).

Results and conclusions:

Objetivos:
¿Aumenta un nivel bajo de selenio en los tejidos humanos el riesgo de cáncer de mama?

Diseño del estudio:
Este artículo de revisión incluyó 18 estudios de casos y controles con 3,374 mujeres diagnosticadas con cáncer de mama (grupo de casos) y 3,582 controles sanos (mujeres sin cáncer de mama).

Objectives:
Does citrus dietary intake reduce the risk of lung cancer?

Study design:
This review article included 21 observational studies.

Results and conclusions:
The investigators found pooled analyses showed that those with the highest citrus fruit dietary intake compared to the lowest intake had a 9% reduction in lung cancer risk [OR = 0.91, 95% CI = 0.84 to 0.98].