Eligibility criteria: Studies will be eligible to be included if: (i) they have a cohort design, prospective
or retrospective, (ii) examine the association of a priori or a posteriori dietary pattern or patterns after cancer diagnosis with at least one of the primary endpoints of interest, all-cause mortality and
cancer-specific mortality, (iii) the study population consists of cancer survivors, defined as women and men aged 18 years and older with a diagnosis of primary cancer (from the time of diagnosis through the remainder of their lives), (iv) the minimum sample size is 100 participants, (v) the length of follow-up is at least six months, and (vi) provide a measure of association, such as Hazard Ratio (HR), and the corresponding 95% confidence intervals (CIs), or sufficient information for their calculation, for the comparison between the highest versus the lowest category of adherence to one a priori or a posteriori dietary pattern. The search will exclude editorials, letters to the Editor, comments, conference abstracts, systematic reviews and meta-analyses and it will be
limited to English articles.