IMPACT OF OBESITY ON CANCER: FROM PATHOGENESIS TO PHARMACOTHERAPEUTIC CHALLENGES AND MANAGEMENT OF TREATMENT-INDUCED WEIGHT GAIN
DOI:
https://doi.org/10.69598/tbps.21.2.153-164Keywords:
obesity, cancer, pharmacokinetics, adverse drug reactions, weight management, pharmaceutical careAbstract
Obesity is a critical risk factor influencing both cancer incidence and prognosis. This narrative review aims to provide readers with a comprehensive understanding of the obesity–cancer relationship across three key dimensions: (1) the pathogenic mechanisms by which obesity promotes tumor development and progression, (2) the impact of obesity on anticancer drug pharmacokinetics and the associated challenges in dose optimization, and (3) proactive pharmaceutical care strategies for obese cancer patients, including the management of treatment-induced weight gain. Pathogenetically, obesity promotes tumor progression through three principal mechanisms: chronic low-grade inflammation, hyperinsulinemia-driven dysregulation of the Insulin/IGF-1 signaling axis leading to aberrant cancer cell proliferation, and alterations in sex hormone metabolism that favor the growth of hormone-sensitive cancers. Regarding pharmacotherapy, obesity significantly alters the pharmacokinetics of anticancer agents, particularly by increasing the volume of distribution for lipophilic drugs and impairing drug clearance, thereby heightening the risk of severe adverse reactions including cardiotoxicity and peripheral neuropathy. Clinical evidence supports dosing based on actual body weight to prevent subtherapeutic exposure. Furthermore, this review highlights sarcopenic obesity, frequently exacerbated by corticosteroids and hormonal therapies, as a clinically underrecognized concern. Pharmacists play a pivotal role in proactive pharmaceutical care by optimizing dose individualization, monitoring drug safety, and managing metabolic complications to enhance therapeutic efficacy and patient quality of life.
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