Gene Variant Detail

Contact

Missing content? – Request curation!

Request curation for specific Genes, Variants, or PubMed publications.

Have questions, comments, or suggestions? - Let us know!

Email us at : ckbsupport@jax.org

Gene PIK3CA
Variant E542K
Impact List missense
Protein Effect gain of function
Gene Variant Descriptions PIK3CA E542K is a hotspot mutation that lies within the PIK helical domain of the Pik3ca protein (UniProt.org). E542K results in increased phosphorylation of Akt, growth factor-independent cell survival, and is transforming in cell culture (PMID: 16533766, PMID: 26627007, PMID: 29533785).
Associated Drug Resistance
Category Variants Paths

PIK3CA mutant PIK3CA act mut PIK3CA E542K

PIK3CA mutant PIK3CA exon10 PIK3CA E542X PIK3CA E542K

Filtering

  • Case insensitive filtering will display rows if any text in any cell matches the filter term
  • Use simple literal full or partial string matches
  • Separate multiple filter terms with a space. Any order may be used (i. e. a b c and c b a are equivalent )
  • Filtering will only apply to rows that are already loaded on the page. Filtering has no impact on query parameters.
  • Use quotes to match on a longer phrase with spaces (i.e. "mtor c1483f")

Sorting

  • Generally, the default sort order for tables is set to be first column ascending; however, specific tables may set a different default sort order.
  • Click on any column header arrows to sort by that column
  • Hold down the Shift key and click multiple columns to sort by more than one column. Be sure to set ascending or descending order for a given column before moving on to the next column.

Transcript NM_006218.4
gDNA chr3:g.179218294G>A
cDNA c.1624G>A
Protein p.E542K
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
XM_011512894 chr3:g.179218294G>A c.1624G>A p.E542K RefSeq GRCh38/hg38
XM_006713658 chr3:g.179218294G>A c.1624G>A p.E542K RefSeq GRCh38/hg38
NM_006218 chr3:g.179218294G>A c.1624G>A p.E542K RefSeq GRCh38/hg38
NM_006218.3 chr3:g.179218294G>A c.1624G>A p.E542K RefSeq GRCh38/hg38
NM_006218.4 chr3:g.179218294G>A c.1624G>A p.E542K RefSeq GRCh38/hg38
XM_006713658.4 chr3:g.179218294G>A c.1624G>A p.E542K RefSeq GRCh38/hg38
XM_006713658.5 chr3:g.179218294G>A c.1624G>A p.E542K RefSeq GRCh38/hg38
XM_011512894.2 chr3:g.179218294G>A c.1624G>A p.E542K RefSeq GRCh38/hg38

Filtering

  • Case insensitive filtering will display rows if any text in any cell matches the filter term
  • Use simple literal full or partial string matches
  • Separate multiple filter terms with a space. Any order may be used (i. e. a b c and c b a are equivalent )
  • Filtering will only apply to rows that are already loaded on the page. Filtering has no impact on query parameters.
  • Use quotes to match on a longer phrase with spaces (i.e. "mtor c1483f")

Sorting

  • Generally, the default sort order for tables is set to be first column ascending; however, specific tables may set a different default sort order.
  • Click on any column header arrows to sort by that column
  • Hold down the Shift key and click multiple columns to sort by more than one column. Be sure to set ascending or descending order for a given column before moving on to the next column.

Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
PIK3CA E542K colon adenocarcinoma sensitive VS-5584 Preclinical Actionable In preclinical studies, VS-5584 demonstrated efficacy in a variety of cancer cell lines, particularly those harboring PIK3CA mutations (PMID: 23270925). 23270925
PIK3CA E542K colorectal cancer sensitive PD-0325901 + Pictilisib Preclinical - Cell line xenograft Actionable In preclinical studies, the combination of GDC-0941 and PD-0325901 (PI3K and MEK inhibitors, respectively) inhibited tumor growth in colorectal cancer cell line xenograft models (PMID: 24339963). 24339963
PIK3CA E542K Advanced Solid Tumor sensitive Sirolimus Preclinical Actionable In a preclinical study, Rapamune (sirolimus) demonstrated efficacy in inhibiting transformation of cultured cells containing PIK3CA E542K mutations (PMID: 15647370). 15647370
PIK3CA E542K gastrointestinal system cancer sensitive Capivasertib Preclinical - Cell culture Actionable In a preclinical study, gastric cancer cells harboring PIK3CA E542K demonstrated sensitivity to the AKT inhibitor Truqap (capivasertib), resulting in decreased proliferation in culture (PMID: 24088382). 24088382
PIK3CA E542K breast cancer sensitive MEN1611 Preclinical Actionable In a preclinical study, MEN1611 (CH5132799) inhibited proliferation of a breast cancer cell line harboring PIK3CA E542K in culture (PMID: 21558396). 21558396
PIK3CA E542K colorectal cancer predicted - sensitive Cetuximab + Irinotecan Case Reports/Case Series Actionable In a retrospective analysis, treatment with the combination of Erbitux (cetuximab) and Camptosar (irinotecan) resulted in a partial response in 50% (1/2) and stable disease in 50% (1/2) of colorectal carcinoma patients harboring a PIK3CA E542K mutation (PMID: 25714871). 25714871
PIK3CA E542K breast cancer sensitive Dactolisib Preclinical Actionable In a preclinical study, BEZ235 inhibited survival of transformed breast epithelial cell lines overexpressing PIK3CA E542K in culture (PMID: 26627007). 26627007
PIK3CA E542K breast cancer sensitive Alpelisib Preclinical - Cell culture Actionable In a preclinical study, Alpelisib (BYL719) inhibited survival of transformed breast epithelial cell lines overexpressing PIK3CA E542K in culture (PMID: 26627007). 26627007
PIK3CA E542K breast cancer sensitive MK2206 Preclinical Actionable In a preclinical study, MK2206 inhibited survival of transformed breast epithelial cell lines overexpressing PIK3CA E542K in culture (PMID: 26627007). 26627007
PIK3CA E542K breast cancer sensitive Lapatinib Preclinical Actionable In a preclinical study, Tykerb (lapatinib) inhibited survival of transformed breast epithelial cell lines overexpressing PIK3CA E542K in culture (PMID: 26627007). 26627007
PIK3CA E542K breast cancer sensitive Neratinib Preclinical Actionable In a preclinical study, Nerlynx (neratinib) inhibited survival of transformed breast epithelial cell lines overexpressing PIK3CA E542K in culture (PMID: 26627007). 26627007
PIK3CA E542K breast cancer sensitive Trametinib Preclinical Actionable In a preclinical study, Mekinist (trametinib) inhibited survival of transformed breast epithelial cell lines overexpressing PIK3CA E542K in culture (PMID: 26627007). 26627007
PIK3CA E542K head and neck squamous cell carcinoma predicted - sensitive Apitolisib Case Reports/Case Series Actionable In a Phase I trial, Apitolisib (GDC-0980) treatment resulted in a partial response in a patient with head and neck squamous cell carcinoma harboring a PIK3CA E542K mutation (PMID: 26787751; NCT00854152). 26787751
PIK3CA E542K thyroid gland papillary carcinoma sensitive MK2206 Preclinical - Cell culture Actionable In a preclinical study, MK2206 inhibited AKT activation, proliferation, and growth of thyroid cancer cell lines with PI3K/AKT pathway alterations in culture, including a papillary thyroid cancer cell line harboring PIK3CA E542K (PMID: 21289267). 21289267
PIK3CA E542K thyroid gland papillary carcinoma sensitive MK2206 + Temsirolimus Preclinical - Cell culture Actionable In a preclinical study, MK2206 suppressed activation of AKT induced by Torisel (temsirolimus), and MK2206 and Torisel (temsirolimus) demonstrated synergy in inhibiting growth of a papillary thyroid cancer cell line harboring PIK3CA E542K in culture (PMID: 21289267). 21289267
PIK3CA E542K breast cancer sensitive Miransertib Preclinical - Cell culture Actionable In a preclinical study, a hormone breast cancer cell line harboring PIK3CA E542K was sensitive to Miransertib (ARQ092) in culture, demonstrating inhibition of cell growth (PMID: 26469692). 26469692
PIK3CA E542K colorectal cancer resistant Cetuximab + Fluorouracil Preclinical - Cell culture Actionable In a preclinical study, colorectal cancer cells over expressing PIK3CA E542K were resistant to Erbitux (cetuximab) and Fluorouracil combination treatment in culture (PMID: 28424201). 28424201
PIK3CA E542K cervical squamous cell carcinoma sensitive Gemcitabine + LY2780301 Phase Ib/II Actionable In a Phase Ib trial, a patient with cervical squamous cell carcinoma harboring PIK3CA E542K demonstrated a partial response when treated with a combination of LY2780301 and Gemzar (gemcitabine) (PMID: 28750271). 28750271
PIK3CA E542K breast cancer resistant Buparlisib Preclinical - Cell culture Actionable In a preclinical study, breast cancer cells expressing PIK3CA E542K demonstrated resistance to treatment with Buparlisib (BKM120) in culture (PMID: 29636477). 29636477
PIK3CA E542K lung squamous cell carcinoma no benefit Taselisib Case Reports/Case Series Actionable In a Phase I (SWOG S1400B) trial, Taselisib (GDC-0032) treatment did not meet its primary endpoint for response rate in patients with lung squamous cell carcinoma harboring PIK3CA mutations, resulting in no responses in patients harboring PIK3CA E542K (n=6) (PMID: 31158500; NCT02785913). 31158500
PIK3CA E542K Her2-receptor negative breast cancer no benefit Everolimus Phase III Actionable In a retrospective analysis of a Phase III trial (BOLERO-2), Afinitor (everolimus) demonstrated comparable progression-free survival benefit in patients with hormone receptor-positive, Erbb2 (Her2)-negative breast cancer harboring wild-type (HR=0.43) or mutant (HR=0.37) PIK3CA, similar benefit was observed in subgroups harboring PIK3CA H1047R (HR=0.37) and PIK3CA E545K/E542K (HR=0.30) (PMID: 28183140; NCT00863655). 28183140
PIK3CA E542K endometrial adenocarcinoma no benefit Copanlisib Case Reports/Case Series Actionable In a Phase II (NRG-GY008) trial, Aliqopa (copanlisib) was well tolerated but demonstrated limited efficacy, resulted in stable disease in 2 patients with serous endometrial adenocarcinoma harboring PIK3CA E542K (PMID: 31934607). 31934607
PIK3CA E542K high grade glioma sensitive Buparlisib + Selumetinib Preclinical - Cell culture Actionable In a preclinical study, the combination therapy of Buparlisib (BKM120) and Koselugo (selumetinib) led to a synergistic effect, resulting in greater growth inhibition of astrocytoma cells expressing PIK3CA E542K than cells with wild-type PIK3CA in culture (PMID: 29975751). 29975751
PIK3CA E542K stomach cancer sensitive Capivasertib Case Reports/Case Series Actionable In a clinical case study, treatment with Truqap (capivasertib) in a patient with gastric cancer harboring PIK3CA E542K resulted in a partial response, and in preclinical studies, led to decreased cell proliferation in a gastric cancer cell line harboring PIK3CA E542K (PMID: 32070411). 32070411
PIK3CA E542K head and neck squamous cell carcinoma predicted - sensitive Alpelisib + Cetuximab + Radiotherapy Case Reports/Case Series Actionable In a Phase Ib trial, 11 of 11 patients with metastatic head and neck squamous cell carcinoma demonstrated no evidence of disease at 3 to 4 months following treatment with Piqray (alpelisb) in combination with Erbitux (cetuximab) and intensity modulated radiation therapy (IMRT), and PIK3CA E542K was identified in one patient with oropharyngeal squamous cell carcinoma who had a near complete radiologic response within 8 days of starting IMRT (PMID: 31678634). 31678634
PIK3CA E542K stomach cancer sensitive MK2206 Preclinical - Cell culture Actionable In a preclinical study, MK2206 treatment induced cell death and inhibited proliferation of a gastric cancer cell line harboring PIK3CA E542K in culture (PMID: 32439931). 32439931
PIK3CA E542K stomach cancer sensitive ARQ 751 Preclinical - Cell culture Actionable In a preclinical study, ARQ 751 treatment induced cell death and inhibited proliferation of a gastric cancer cell line harboring PIK3CA E542K in culture (PMID: 32439931). 32439931
PIK3CA E542K stomach cancer sensitive Miransertib Preclinical - Cell culture Actionable In a preclinical study, Miransertib (ARQ092) treatment induced cell death and inhibited proliferation of a gastric cancer cell line harboring PIK3CA E542K in culture (PMID: 32439931). 32439931
PIK3CA E542K stomach cancer predicted - sensitive GSK690693 Preclinical - Cell culture Actionable In a preclinical study, GSK690693 treatment did not increase cell death but inhibited proliferation of a gastric cancer cell line harboring PIK3CA E542K in culture (PMID: 32439931). 32439931
PIK3CA E542K stomach cancer predicted - sensitive Ipatasertib Preclinical - Cell culture Actionable In a preclinical study, Ipatasertib (GDC-0068) treatment did not increase cell death but inhibited proliferation of a gastric cancer cell line harboring PIK3CA E542K in culture (PMID: 32439931). 32439931
PIK3CA E542K endometrial serous adenocarcinoma predicted - sensitive Copanlisib Case Reports/Case Series Actionable In a Phase II trial (NCI MATCH EAY131-Z1F), Aliqopa (copanlisib) treatment resulted in a partial response and progression-free survival of 5.4 months and an overall survival of 8.2 months in a patient with endometrial serous adenocarcinoma harboring PIK3CA E542K (PMID: 35133871; NCT02465060). 35133871
PIK3CA E542K Her2-receptor positive breast cancer sensitive STX-478 Preclinical - Pdx Actionable In a preclinical study, STX-478 inhibited tumor growth of a ERBB2 (HER2)-positive breast cancer patient-derived xenograft (PDX) model harboring PIK3CA E542K (PMID: 37623743). 37623743
PIK3CA E542K Her2-receptor negative breast cancer predicted - sensitive HS-10352 Case Reports/Case Series Actionable In a Phase I trial, HS-10352 treatment resulted in an objective response rate (ORR) of 27.8% (5/18, all partial responses), disease control rate (DCR) of 55.6%, and median progression-free survival (mPFS) of 3.9 mo in HR-positive, ERBB2 (HER2)-negative advanced breast cancer patients overall, and in the 6mg group led to an ORR of 66.7% and DCR of 83.3%, with an ORR of 75.0% (3/4) and DCR of 100% in patients with PIK3CA mutations (E542K, E545K, E545D, H1047L, H1047R) (PMID: 38037839; NCT04631835). 38037839
PIK3CA E542K estrogen-receptor positive breast cancer predicted - sensitive RLY-2608 Case Reports/Case Series Actionable In a clinical case study, treatment with RLY-2608 resulted in a partial response with disappearance of the soft tissue target lesion, which was ongoing at day 141, in a patient with ESR1/PGR-positive, ERBB2 (HER2)-negative breast cancer harboring PIK3CA E542K (PMID: 37916956; NCT05216432). 37916956