Melanomaisadevastatingdisease,withfive-yearsurvivalratesformetastaticdiseaseunder15%.Exciting newtherapieshaveemergedforBRAF-mutantmelanoma,butNRASmutantmelanomacontinuestohave poor prognosis and limited therapeutic options. Even with the newest targeted- and immuno-therapies, a largepercentofpatientsdoesnotbenefitand/orexperiencediseaseprogression.Inparticular,the~30% of melanoma patients whose tumors have mutations in the NRAS oncogene, and those who become re- sistanttocurrenttherapies,havelimitedtreatmentoptionsandpoorprognosis.Developingeffectivethera- pies for NRAS mutant melanoma and overcoming resistance to BRAF/MEK inhibition is of utmost im- portanceinmelanoma. IdentifyingvulnerabilitiesinNRAS-drivenmelanomasiscriticaltodesigneffectivetreatmentsforthisclass oftumors,astherearecurrentlynodrugstodirectlyinhibitmutantNRAS.MutationsintheTERTpromoter, (thecatalyticsubunitofTelomerase)arefoundinapproximately70%ofmelanomas,constitutingthemost frequent genetic alteration in this cancer. Preliminary studies by our team indicate that melanomas are highlyaddictedtoTERT,asdepletionorinhibitionofTERTcausesstrikingandrapidapoptosis.Thesedata supportthehypothesisthatTERTplaysacriticalroleinmelanomaandconstitutesacompellingtar- getfortherapy.ThegoalofthisproposalistoestablishtheefficacyoftargetingTERTinmelanoma,alone andincombinationwithotherpromisingtherapies.Acorollaryofthisgoalistodissectthecontributionof TERTtomelanomasurvivalandprogression.
In Aim1, weproposetosystematicallydissectthecontribu- tion of TERT?s telomere-dependent and -independent roles for melanoma progression and survival, with particularfocusonNRAS-mutantmelanoma,whichisinurgentneedofnewtherapies.Todatenogroup hassystematicallyexploredTERTinhibitioninmelanomapre-clinicalandpatient-derivedxenograftmodels, particularly in combination with other therapies.
In Aim 2 we will address this gap in knowledge by as- sessingtheefficacyofcombiningnovelTERT-basedapproacheswithpromisinganti-melanomatherapies, includinginhibitorsofmitochondrialmetabolismandimmunotherapies.Weexpectthattheproposedwork will enable us to: i) Mechanistically determine the contribution of telomere-dependent and telomere- independent functions of TERT in melanoma;? ii) Develop novel combination strategies for NRAS mutant melanomaandmelanomasresistanttotherapy;?iii)Provideactionableinformationthatwillguidethedesign ofnovel,TERT-basedcombinationtherapiesaimedatpreventingandovercomingdrugresistance,anden- hancing the durability of responses and survival benefits for melanoma patients. Additionally, we expect thatourstudieswillpavethewayfornoveltreatmentsforothercancerswithTERTand/orRASmutations, heighteningthepotentialimpactofourproposal.

Public Health Relevance

Melanomaisasignificantpublichealthproblem,affectingclosetoamillionpeopleintheUnitedStates.The incidenceofmelanomahasbeensteadilyincreasingduringthepastdecade,andthe5-yearrelativesurvival rate for patients with metastatic melanoma is only 15%. Several new therapies have recently become available,butmorethanathirdofpatientsdonotrespond,andmanyexperiencediseaserelapse.Therefore, newtherapeuticstrategiesforthisdiseaseareurgentlyneeded.Theproposedresearchtakesadvantageof the genetics of melanoma, which show that TERT promoter mutations exist in a significant percentage of thesetumors.WeproposetoexploittheaddictionofmelanomastoTERTusingnovelTERT-basedstrategies forimprovedtreatmentofthisaggressivecancer.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
1R01CA215733-01
Application #
9290084
Study Section
Special Emphasis Panel (ZRG1-BMCT-C (01)S)
Program Officer
Forry, Suzanne L
Project Start
2017-03-07
Project End
2022-02-28
Budget Start
2017-03-07
Budget End
2018-02-28
Support Year
1
Fiscal Year
2017
Total Cost
$439,183
Indirect Cost
$208,034
Name
Wistar Institute
Department
Type
Research Institutes
DUNS #
075524595
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
Echevarría-Vargas, Ileabett M; Reyes-Uribe, Patricia I; Guterres, Adam N et al. (2018) Co-targeting BET and MEK as salvage therapy for MAPK and checkpoint inhibitor-resistant melanoma. EMBO Mol Med 10:
Reyes-Uribe, Patricia; Adrianzen-Ruesta, Maria Paz; Deng, Zhong et al. (2018) Exploiting TERT dependency as a therapeutic strategy for NRAS-mutant melanoma. Oncogene 37:4058-4072
Echevarría-Vargas, Ileabett M; Villanueva, Jessie (2017) COMBATING NRAS MUTANT MELANOMA: FROM BENCH TO BEDSIDE. Melanoma Manag 4:183-186