The role of ATM and 53BP1 as predictive markers in cervical cancer

Treatment of advanced‐stage cervical cancers with (chemo)radiation causes cytotoxicity through induction of high levels of DNA damage. Tumour cells respond to DNA damage by activation of the ‘DNA damage response’ (DDR), which induces DNA repair and may counteract chemoradiation efficacy. Here, we investigated DDR components as potential therapeutic targets and verified the predictive and prognostic value of DDR activation in patients with cervical cancer treated with (chemo)radiation. In a panel of cervical cancer cell lines, inactivation of ataxia telangiectasia mutated (ATM) or its substrate p53‐binding protein‐1 (53BP1) clearly gave rise to cell cycle defects in response to irradiation. Concordantly, clonogenic survival analysis revealed that ATM inhibition, but not 53BP1 depletion, strongly radiosensitised cervical cancer cells. In contrast, ATM inhibition did not radiosensitise non‐transformed epithelial cells or non‐transformed BJ fibroblasts. Interestingly, high levels of active ATM prior to irradiation were related with increased radioresistance. To test whether active ATM in tumours prior to treatment also resulted in resistance to therapy, immunohistochemistry was performed on tumour material of patients with advanced‐stage cervical cancer (n = 375) treated with (chemo)radiation. High levels of phosphorylated (p‐)ATM [p = 0.006, hazard ratio (HR) = 1.817] were related to poor locoregional disease‐free survival. Furthermore, high levels of p‐ATM predicted shorter disease‐specific survival (p = 0.038, HR = 1.418). The presence of phosphorylated 53BP1 was associated with p‐ATM (p = 0.001, odds ratio = 2.206) but was not related to any clinicopathological features or survival. In conclusion, both our in vitro and patient‐related findings indicate a protective role for ATM in response to (chemo)radiation in cervical cancer and point at ATM inhibition as a possible means to improve the efficacy of (chemo)radiation.

• Publication year

  2012

• Venue

  International Journal of Cancer

• Publication date

  2012-02-10

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1002/ijc.27488PMID 22323184PMCID 3504092
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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