Snežana Hinić, Rachel S van der Post, Lilian Vreede, Janneke Schuurs-Hoeijmakers, Saskia Koene, Erik A M Jansen, Franziska Bervoets-Metge, Arjen R Mensenkamp, Nicoline Hoogerbrugge, Marjolijn J L Ligtenberg, Richarda M de Voer
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The genomic landscape of breast and non-breast cancers from individuals with germline CHEK2 deficiency.
CHEK2 is considered to be involved in homologous recombination repair (HRR). Individuals who have germline pathogenic variants (gPVs) in CHEK2 are at increased risk to develop breast cancer and likely other primary cancers. PARP inhibitors (PARPi) have been shown to be effective in the treatment of cancers that present with HRR deficiency-for example, caused by inactivation of BRCA1/2. However, clinical trials have shown little to no efficacy of PARPi in patients with CHEK2 gPVs. Here, we show that both breast and non-breast cancers from individuals who have biallelic gPVs in CHEK2 (germline CHEK2 deficiency) do not present with molecular profiles that fit with HRR deficiency. This finding provides a likely explanation why PARPi therapy is not successful in the treatment of CHEK2-deficient cancers.
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