PTN level is increased in several types of cancer including glioma, breast cancer, lung cancer, melanoma, neuroblastoma, pancreatic cancer, and prostate cancer, and may increase tumor growth either through direct effects on tumor cells or through stimulation of angiogenesis and remodeling of the tumor microenvironment [214, 215]
Additionally, the presence of publication bias suggested by Eggers test and funnel plot asymmetry indicates that smaller studies with non-significant results might be underrepresented
Data from a review of patient experiences and surveys involving more than 2200 patients with B12 deficiency in the UK indicate that many patients have concerns related to healthcare quality, safety, and treatment, with nearly two-thirds of respondents reporting that their treatment is insufficient to manage symptoms
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[3] Yokoyama H., et al