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Phosphatidylinositol 3-kinase hyperactivation results in lapatinib resistance that is reversed by the mTOR/phosphatidylinositol 3-kinase inhibitor NVP-BEZ235.

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Cancer Res2008PMID 19010894PMC2587064stubpubmedProvenance
Source
PubMed
Retrieved
Sep 8, 2026
Layer
normalized (units and labels harmonized; values unchanged)
Run
ING-CIVIC-20260908-000001
Published

Abstract

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Linked entities

Linked entities (12)

How each link was made (MeSH, dictionary, registry reference, curation…) and whether it has been validated. Candidate links are not counted in entity statistics.

Validated 12

Curated evidence

Evidence citing this paper (29)

civicProvenance
Source
CIViC — Clinical Interpretation of Variants in Cancer
Dataset
CIViC evidence items
Version
civic-2026-09-08
Retrieved
Sep 8, 2026
Layer
normalized (units and labels harmonized; values unchanged)
Evidence
expert curation
License
CC0 1.0
PMID
19010894
Run
ING-CIVIC-20260908-000001
Open at source
CuratedShowing 1–29 of 29 evidence items · levels, directions and significance as curated at the source; each row links to its CIViC record.
TherapyCancerTypeLevelDirection · significanceRating (1–5)StatusEvidenceSource
PIK3CA Amplification3
Dactolisib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2submitted
EID8272

In a preclinical study, efficacy of NVP-BEZ235 (dactolisib) and trastuzumab combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with retrovirally induced PI… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + Lapatinib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2submitted
EID8273

In a preclinical study, efficacy of NVP-BEZ235 (dactolisib), lapatinib, and trastuzumab combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with retrovirall… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + LapatinibSubstitutesHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2accepted
EID8271

This preclinical study tested the sensitivity of HER2-positive breast cancer cell line BT-474 (heterozygous for PIK3CA K111N) retrovirally transduced with wildtype PIK3CA to NVP-BEZ235 (dactolisib; a … (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
PIK3CA E545K7
DactolisibHER2-Positive Breast CarcinomaALIASPredictiveDDoes Not Support Resistance3accepted
EID6213

This preclinical study tested the sensitivity of HER2-positive breast cancer cell line BT-474 (heterozygous for PIK3CA K111N) retrovirally transduced with PIK3CA E545K to NVP-BEZ235 (dactolisib; a dua… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2submitted
EID8180

In a preclinical study, efficacy of trastuzumab and NVP-BEZ235 (dactolisib) combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with retrovirally induced PI… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
LapatinibHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance3accepted
EID6207

This preclinical study tested, in vitro, the resistance to lapatinib (an anti-HER2 drug) of HER2-positive breast cancer cell lines (BT474 and SKBR3) retrovirally transduced with E545K. The study found… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + LapatinibCombinationHER2-Positive Breast CarcinomaALIASPredictiveDDoes Not Support Resistance2submitted
EID6212

This preclinical study tested the sensitivity of HER2-positive breast cancer cell line BT-474 (heterozygous for PIK3CA K111N) retrovirally transduced with PIK3CA E545K to NVP-BEZ235 (dactolisib; a dua… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Lapatinib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance3accepted
EID6211

In a preclinical study, efficacy of lapatinib and trastuzumab was evaluated in vitro against HER2 amplified breast cancer cell lines BT474 (heterozygous for PIK3CA K111N) or SKBR3, retrovirally transd… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
TrastuzumabHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance3accepted
EID6209

This preclinical study tested, in vitro, the resistance to trastuzumab (an anti-HER2 drug) of HER2-positive cell lines (BT474 and SKBR3) retrovirally transduced with E545K. The study found that the E5… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + Lapatinib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2submitted
EID8181

In a preclinical study, efficacy of trastuzumab, lapatinib, and NVP-BEZ235 (dactolisib) combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with retrovirall… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
PIK3CA H1047R6
DactolisibHER2-Positive Breast CarcinomaALIASPredictiveDDoes Not Support Resistance4accepted
EID6206

This preclinical study tested the sensitivity of HER2-positive breast cancer cell line BT-474 (heterozygous for PIK3CA K111N) retrovirally transduced with PIK3CA H1047R to NVP-BEZ235 (dactolisib; a du… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2submitted
EID8182

In a preclinical study, efficacy of trastuzumab and NVP-BEZ235 (dactolisib) combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with retrovirally induced PI… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
LapatinibHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance3accepted
EID6202

This preclinical study tested, in vitro, the resistance to lapatinib (an anti-HER2 drug) of HER2-positive breast cancer cell lines (BT474 and SKBR3) retrovirally transduced with H1047R. The study foun… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + LapatinibCombinationHER2-Positive Breast CarcinomaALIASPredictiveDDoes Not Support Resistance3submitted
EID6205

This preclinical study tested the sensitivity to lapatinib and NVP-BEZ235 (dactolisib; a dual PI3K/mTOR inhibitor) of a HER2-positive breast cancer cell line (BT474) retrovirally transduced with PIK3C… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Lapatinib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance4accepted
EID6204

In a preclinical study, efficacy of lapatinib and trastuzumab was evaluated in vitro against HER2 amplified breast cancer cell line BT474 (heterozygous for PIK3CA K111N) retrovirally transduced with P… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
TrastuzumabHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance3accepted
EID6203

This preclinical study tested the effect of trastuzumab (an anti-HER2 drug) on HER2-positive breast cancer cell lines (BT474 and SKBR3) retrovirally transduced with H1047R. The study found that the H1… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
PIK3CA K111N1
Dactolisib + Lapatinib + TrastuzumabSubstitutesHER2-Positive Breast CarcinomaALIASPredictiveDDoes Not Support Resistance2accepted
EID8183

The BT-474 HER2 positive human breast cancer cell line, which is heterozygous for the PIK3CA K111N mutation, demonstrated strongly reduced colony formation when treated with lapatinib, trastuzumab or … (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
PIK3CA K111N + PTEN UnderexpressionPIK3CAPTEN7
DactolisibHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance2accepted
EID8276

In a preclinical study, efficacy of dactolisib monotherapy was evaluated in vitro against HER2 amplified human breast cancer cell line BT474 (heterozygous for PIK3CA K111N) with shRNA-induced PTEN exp… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2submitted
EID8283

In a preclinical study, efficacy of NVP-BEZ235 (dactolisib) and trastuzumab combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with shRNA-induced PTEN expr… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
LapatinibHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance4accepted
EID8275

In a preclinical study, efficacy of trastuzumab monotherapy was evaluated in vitro against HER2 amplified human breast cancer cell line BT474 (heterozygous for PIK3CA K111N) with shRNA-induced PTEN ex… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + LapatinibCombinationHER2-Positive Breast CarcinomaALIASPredictiveDDoes Not Support Resistance2accepted
EID8278

In a preclinical study, efficacy of NVP-BEZ235 (dactolisib; a dual PI3K/mTOR inhibitor) and lapatinib combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 (h… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Lapatinib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2submitted
EID8277

In a preclinical study, efficacy of lapatinib and trastuzumab combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with shRNA-induced PTEN expression loss. A… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
TrastuzumabHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance2accepted
EID8274

In a preclinical study, efficacy of trastuzumab monotherapy was evaluated in vitro against HER2 amplified human breast cancer cell line BT474 (heterozygous for PIK3CA K111N) with shRNA-induced PTEN ex… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Dactolisib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDDoes Not Support Resistance2accepted
EID8279

In a preclinical study, efficacy of NVP-BEZ235 (dactolisib; a dual PI3K/mTOR inhibitor) and trastuzumab combination therapy was evaluated in vitro against HER2 amplified human breast cancer cell line … (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
PIK3CA Overexpression4
DactolisibHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2accepted
EID8269

In a preclinical study, efficacy of NVP-BEZ235 (dactolisib) monotherapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with retrovirally induced PIK3CA amplification. Auth… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
LapatinibHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2accepted
EID8268

In a preclinical study, efficacy of lapatinib monotherapy was evaluated in vitro against HER2 amplified breast cancer cell lines (BT474 and SKBR3) with retrovirally induced PIK3CA expression. Authors … (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
Lapatinib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2accepted
EID8270

In a preclinical study, efficacy of lapatinib and trastuzumab combination therapy was evaluated in vitro against HER2 amplified breast cancer cell lines (BT474 and SKBR3) with retrovirally induced PIK… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
TrastuzumabHER2-Positive Breast CarcinomaALIASPredictiveDSupports Resistance2accepted
EID8267

HER2-positive breast cancer cell lines (BT-474 and SKBR3) were retrovirally transduced with wildtype PIK3CA and treated with trastuzumab. PIK3CA overexpression diminished the growth inhibitory effects… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic
PTEN Loss1
Dactolisib + Lapatinib + TrastuzumabCombinationHER2-Positive Breast CarcinomaALIASPredictiveDSupports Sensitivity Response2submitted
EID8280

In a preclinical study, efficacy of NVP-BEZ235 (dactolisib), lapatinib, and trastuzumab combination therapy was evaluated in vitro against HER2 amplified breast cancer cell line BT474 with shRNA-induc… (full text at CIViC)

PMID 19010894 · Eichhorn et al., 2008 · Open in CIViC

civic