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ISAACSSON VELHO, CASTRO JR, AND CHUNG<br />

Table 1. Active Clinical Trials Evaluating PI3K/AKT/mTOR Targeted Agents in Patients with Locally Advanced,<br />

Recurrent, and/or Metastatic HNSCC*<br />

Targeted Agent Additional Targeted Agent Additional Therapy Inclusion Criteria Phase Clinical Trial Identifier<br />

PI3K Inhibitor<br />

PX-866 - Docetaxel Recurrent or metastatic HNSCC/NSCLC I/II NCT01204099<br />

PX-866 Cetuximab - Recurrent or metastatic HNSCC/CRC I/II NCT01252628<br />

BYL-719 - - Recurrent or metastatic HNSCC II NCT02145312<br />

BYL-719 Cetuximab - Recurrent or metastatic HNSCC I/II NCT01602315<br />

BYL-719 Paclitaxel Recurrent or metastatic HNSCC/BRC I NCT02051751<br />

Buparlisib - - Recurrent or metastatic HNSCC II NCT01527877<br />

Buparlisib Cetuximab - Recurrent or metastatic HNSCC I/II NCT01816984<br />

Buparlisib - Paclitaxel Recurrent or metastatic HNSCC II NCT01852292<br />

Buparlisib - IMRT, cisplatin Locally advanced HNSCC Ib NCT02113878<br />

PI3K/mTOR Inhibitor<br />

NVP-BEZ235 - - Recurrent or metastatic solid tumors I NCT01343498<br />

NVP-BEZ235 NVP-BKM120 Paclitaxel Recurrent or metastatic solid tumors I NCT01285466<br />

NVP-BEZ235 MEK-162 - Recurrent or metastatic solid tumors I NCT01337765<br />

NVP-BEZ235 Everolimus - Recurrent or metastatic solid tumors I/II NCT01508104<br />

mTOR Inhibitor<br />

Everolimus - - Recurrent or metastatic HNSCC II NCT01111058<br />

Everolimus - - Recurrent or metastatic HNSCC II NCT01051791<br />

Everolimus Cetuximab Carboplatin Recurrent or metastatic HNSCC I/II NCT01283334<br />

Everolimus Erlotinib - Recurrent or metastatic HNSCC II NCT00942734<br />

Everolimus Vatalinib - Recurrent or metastatic solid tumors I NCT00655655<br />

Everolimus - IMRT, cisplatin Locally advanced HNSCC I NCT00858663<br />

Everolimus - Docetaxel, cisplatin Locally advanced HNSCC I NCT00935961<br />

Everolimus - Carboplatin, paclitaxel Locally advanced HNSCC I/II NCT01333085<br />

Everolimus Cetuximab Cisplatin, paclitaxel Locally advanced HNSCC II NCT01133678<br />

Temsirolimus - - Recurrent or metastatic HNSCC II NCT01172769<br />

Temsirolimus - Carboplatin, paclitaxel Recurrent or metastatic HNSCC I/II NCT01016769<br />

Temsirolimus Cetuximab - Recurrent or metastatic HNSCC II NCT01256385<br />

Temsirolimus Cetuximab Cisplatin Recurrent or metastatic HNSCC I/II NCT01015664<br />

Temsirolimus Erlotinib - Recurrent or metastatic HNSCC II NCT01009203<br />

Sirolimus - - Recurrent or metastatic HNSCC I/II NCT01195922<br />

Sirolimus - Grapefruit juice Recurrent or metastatic solid tumors I NCT00375245<br />

Ridaforolimus Cetuximab - Recurrent or metastatic HNSCC/NSCLC/CRC I NCT01212627<br />

Metformin - Paclitaxel Recurrent or metastatic HNSCC II NCT01333852<br />

Abbreviations: HNSCC, head and neck squamous cell carcinoma; IMRT, intensity modulated radiation therapy; NSCLC, non-small cell lung cancer; CRC, colorectal cancer; BRC, breast cancer.<br />

*All trial data are available at www.clinicaltrials.gov.<br />

toxicity. Because of the ease of tumor DNA testing for<br />

PIK3CA mutations, many have proposed that the PIK3CA<br />

mutations are an integral biomarker for screening patient<br />

populations with PI3K pathway activation for future clinical<br />

trials. 37 Some studies suggest that patients with HPV-positive<br />

HNSCC would be more sensitive because of frequent<br />

PIK3CA mutations and enrich the trial. 17 However, in a recent<br />

study of cetuximab with or without PX-866, tumor HPV<br />

status was assessed by p16 immunohistochemistry. 25<br />

Twenty-six patients (57%) of 46 with available tissue were<br />

HPV positive and 20 patients (43%) were HPV negative.<br />

There was no association between the tumor HPV status and<br />

response. PIK3CA mutations were detected in 17% of patients,<br />

but no response was seen in these eight patients with<br />

the PIK3CA mutation-harboring tumors.<br />

In addition, the PI3K pathway activation through compensatory<br />

receptor tyrosine kinase activation, such as MET and<br />

HER3, has been proposed as one of the resistance mechanisms<br />

of EGFR inhibitors in preclinical studies, suggesting<br />

PI3K/mTOR inhibitors may be developed in patients who<br />

are EGFR inhibitor–resistant in addition to patients with the<br />

PIK3CA mutations. 38,39 In a recent preclinical study, the<br />

combined activity of cetuximab and mTOR inhibitors in patients<br />

with HNSCC was evaluated. Cetuximab-sensitive<br />

126 2015 ASCO EDUCATIONAL BOOK | asco.org/edbook

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