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Defining eligible patients for allele-selective chemotherapies targeting NAT2 in colorectal cancer.

Abstract：

:Therapies targeting somatic bystander genetic events represent a new avenue for cancer treatment. We recently identified a subset of colorectal cancer (CRC) patients who are heterozygous for a wild-type and a low activity allele (NAT2*6) but lack the wild-type allele in their tumors due to loss of heterozygosity (LOH) at 8p22. These tumors were sensitive to treatment with a cytotoxic substrate of NAT2 (6-(4-aminophenyl)-N-(3,4,5-trimethoxyphenyl)pyrazin-2-amine, APA), and pointed to NAT2 loss being a therapeutically exploitable vulnerability of CRC tumors. To better estimate the total number of treatable CRC patients, we here determined whether tumor cells retaining also other NAT2 low activity variants after LOH respond to APA treatment. The prevalent low activity alleles NAT2*5 and NAT2*14, but not NAT2*7, were found to be low metabolizers with high sensitivity to APA. By analysis of two different CRC patient cohorts, we detected heterozygosity for NAT2 alleles targetable by APA, along with allelic imbalances pointing to LOH, in ~ 24% of tumors. Finally, to haplotype the NAT2 locus in tumor and patient-matched normal samples in a clinical setting, we develop and demonstrate a long-read sequencing based assay. In total, > 79.000 CRC patients per year fulfil genetic criteria for high sensitivity to a NAT2 LOH therapy and their eligibility can be assessed by clinical sequencing.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Rendo V,Kundu S,Rameika N,Ljungström V,Svensson R,Palin K,Aaltonen L,Stoimenov I,Sjöblom T

doi

10.1038/s41598-020-80288-z

subject

Has Abstract

pub_date

2020-12-31 00:00:00

pages

22436

issue

1

issn

2045-2322

pii

10.1038/s41598-020-80288-z

journal_volume

10

pub_type

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