Treatment with insulin (analogues) and breast cancer risk in diabetics; a systematic review and meta-analysis of in vitro, animal and human evidence
Posted on 2015-08-05 - 05:00
Abstract Introduction Several studies have suggested that anti-diabetic insulin analogue treatment might increase cancer risk. The aim of this study was to review the postulated association between insulin and insulin analogue treatment and breast cancer development, and plausible mechanisms. Method A systematic literature search was performed on breast cell-line, animal and human studies using the key words ‘insulin analogue’ and ‘breast neoplasia’ in MEDLINE at PubMed, EMBASE, and ISI Web of Science databases. A quantitative and qualitative review was performed on the epidemiological data; due to a limited number of reported estimates, a meta-analysis was performed for glargine only. A comprehensive overview was composed for in vitro and animal studies. Protein and gene expression was analysed for the cell lines most frequently used in the included in vitro studies. Results In total 16 in vitro, 5 animal, 2 in vivo human and 29 epidemiological papers were included. Insulin AspB10 showed mitogenic properties in vitro and in animal studies. Glargine was the only clinically available insulin analogue for which an increased proliferative potential was found in breast cancer cell lines. However, the pooled analysis of 13 epidemiological studies did not show evidence for an association between insulin glargine treatment and an increased breast cancer risk (HR 1.04; 95 % CI 0.91-1.17; p=0.49) versus no glargine in patients with diabetes mellitus. It has to be taken into account that the number of animal studies was limited, and epidemiological studies were underpowered and suffered from methodological limitations. Conclusion There is no compelling evidence that any clinically available insulin analogue (Aspart, Determir, Glargine, Glulisine or Lispro), nor human insulin increases breast cancer risk. Overall, the data suggests that insulin treatment is not involved in breast tumour initiation, but might induce breast tumour progression by up regulating mitogenic signalling pathways.
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Bronsveld, Heleen; ter Braak, Bas; Karlstad, Øystein; Vestergaard, Peter; Starup-Linde, Jakob; Bazelier, Marloes; et al. (2016). Treatment with insulin (analogues) and breast cancer risk in diabetics; a systematic review and meta-analysis of in vitro, animal and human evidence. figshare. Collection. https://doi.org/10.6084/m9.figshare.c.3639500.v1
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AUTHORS (12)
HB
Heleen Bronsveld
Bt
Bas ter Braak
ØK
Øystein Karlstad
PV
Peter Vestergaard
JS
Jakob Starup-Linde
MB
Marloes Bazelier
MD
Marie De Bruin
Ad
Anthonius de Boer
CS
Christine Siezen
Bv
Bob van de Water
Jv
Jan van der Laan
MS
Marjanka Schmidt
KEYWORDS
evidence Abstract IntroductionMEDLINEbreast tumour progressionbreast cancer riskHREMBASEinsulin analogue treatmentbreast cancer developmentanimal studiesISIbreast cancer cell linesbreast tumour initiationinsulin glargine treatmentCIinsulin analogueanti-diabetic insulin analogue treatmentInsulin AspB 10insulin increases breast cancer risk