Multiple myeloma (MM) is one of the most common blood cancers. Despite lengthening survival with modern therapy, it remains largely fatal. Understanding the influence of common modifiable risk factors on MM risk is necessary to inform prevention.We investigated the association between dietary exposures and MM in a population-based case-control study conducted in Victoria, and NSW, Australia (2010-2016). Incident cases of MM (n=746) were recruited primarily via cancer registries. Controls (n=706) were siblings or spouses of cases.We estimated odds ratios (OR) and 95% confidence intervals (95%CI) for associations between MM and dietary exposures, including dietary patterns, fish consumption, and a healthy lifestyle index, adjusting for confounders.Higher scores on a modified version of the Alternative Healthy Eating Index-2010 were associated with reduced risk of MM (mAHEI: OR=0.88, 95%CI=0.78-0.98). There was weaker evidence for reduced risk associated with higher healthful plant-based dietary index score (hPDI: OR=0.91, 95%CI=0.81-1.02). Increased MM risks were observed with higher scores on empirical dietary inflammatory pattern (EDIP: OR=1.20, 95%CI=1.07-1.35), empirical dietary indices for hyperinsulinaemia (EDIH: OR=1.15, 95%CI=1.02-1.31), and insulin resistance (EDIR: OR=1.21, 95%CI=1.08-1.37). There was no clear evidence of association with MM risk for fish consumption or a healthy lifestyle index.We observed an association between adherence to a healthy diet and lower MM risk. While adherence to dietary patterns with the potential to increase insulin levels, insulin resistance, or promote inflammation was associated with increased MM risk. Results of studies assessing dietary intervention for MM prevention could reveal whether dietary modification directly influences MM risk.
Cheah et al. (Wed,) studied this question.