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Gene RET
Variant C620R
Impact List missense
Protein Effect gain of function
Gene Variant Descriptions RET C620R lies within the extracellular domain of the Ret protein (PMID: 9230192). C620R results in decreased cell surface Ret expression, but also results in increased Ret and Shc phosphorylation, activation of transcription in a reporter assay, transformation in cell culture (PMID: 9879991, PMID: 9230192), increased Erk phosphorylation and IL3-independent growth in culture (PMID: 36166639).
Associated Drug Resistance
Category Variants Paths

RET mutant RET act mut RET C620R

RET mutant RET C620X RET C620R

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Transcript NM_020975.6
gDNA chr10:g.43113654T>C
cDNA c.1858T>C
Protein p.C620R
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_020975 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_001406743.1 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_001406760.1 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_020975.6 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_001406744.1 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_001406759.1 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_020975.5 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_020630 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_001406765.1 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_020630.5 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_020630.7 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38
NM_001406763.1 chr10:g.43113654T>C c.1858T>C p.C620R RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
RET C620X thyroid gland medullary carcinoma not applicable N/A Guideline Risk Factor Germline RET C620X mutations result in multiple endocrine neoplasia, type 2A (MEN 2A), which is associated with high risk of developing thyroid medullary carcinoma (NCCN.org). detail...
RET mutant thyroid gland medullary carcinoma sensitive Everolimus Phase II Actionable In a Phase II trial, Afinitor (everolimus) treatment resulted in stable disease in 71% (5/7) of medullary thyroid cancer patients, including patients harboring RET mutations, with median progression-free survival of 33 weeks (PMID: 26294908; NCT01118065). 26294908
RET mutant colorectal cancer sensitive Ponatinib Preclinical Actionable In a preclinical study, Iclusig (ponatinib) demonstrated efficacy in RET mutant positive colorectal cancer cell lines (PMID: 23811235). 23811235
RET mutant thyroid gland medullary carcinoma sensitive Cabozantinib Phase III Actionable In a Phase III trial, Cometriq (cabozantinib) treatment resulted in improved progression free survival (60 vs 20 weeks) compared to placebo in thyroid medullary carcinoma patients harboring RET mutations (PMID: 27525386). 27525386
RET mutant lung non-small cell carcinoma unknown unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective clinical study, patients with non-small cell lung cancer harboring rare targetable drivers (RTD) (BRAF, ERBB2/3, RET, MET, ROS1, NTRK) who received immune checkpoint inhibitors (ICI) achieved longer median overall survival (mOS) (32 vs 13 mo, p=0.01) compared to those who did not receive ICI, mOS was 44.9 mo in a patient harboring RET mutation, although RTD type was not associated with OS in a univariate analysis (PMID: 30268448). 30268448
RET mutant lung non-small cell carcinoma predicted - sensitive EP0031 Phase Ib/II Actionable In a Phase I/II trial (KL400-I/II-01), EP0031 treatment was well tolerated in non-small cell lung cancer (NSCLC) patients harboring RET mutations, and resulted in an objective response rate (ORR) of 63% (20/32, 1 complete response (CR)) and disease control rate (DCR) of 91% in pretreated patients, and an ORR of 76% (19/25, 1 CR) and DCR of 92% with median duration of response not reached in treatment-naive patients, and an overall CNS DCR of 100% (J Clin Oncol 41, 2023 (suppl 16; abstr 3007); NCT05265091). detail...
RET mutant thyroid gland medullary carcinoma sensitive Pralsetinib Guideline Actionable Gavreto (pralsetinib) is included in guidelines (category 2B) for patients with medullary thyroid carcinoma harboring RET mutations (NCCN.org). detail...
RET mutant thyroid gland medullary carcinoma sensitive Pralsetinib Guideline Actionable Gavreto (pralsetinib) is included in guidelines for adult or pediatric patients 12 years or older with advanced or metastatic medullary thyroid gland carcinoma harboring RET mutations (PMID: 31549998, PMID: 35491008; ESMO.org). 31549998 detail... 35491008
RET mutant thyroid gland medullary carcinoma sensitive Pralsetinib FDA approved Actionable In a Phase I/II trial (ARROW) that supported FDA approval, Gavreto (pralsetinib) treatment was well-tolerated and resulted in an overall response rate (ORR) of 60% (3/55) in patients with advanced or metastatic medullary thyroid cancer harboring RET mutations who received prior treatments, ORR was 60% (32/53) in patients with prior therapies and 71% (15/21) in treatment-naive patients (PMID: 34118198; NCT03037385). 34118198 detail...
RET mutant thyroid gland medullary carcinoma sensitive Selpercatinib FDA approved - Has Companion Diagnostic Actionable In a Phase I/II trial (LIBRETTO-121) that supported FDA approval, Retevmo (selpercatinib) treatment was safe in pediatric patients of 2 years or older with solid tumors (8 medullary thyroid cancer, 2 papillary thyroid cancer, 1 osteosarcoma) harboring RET fusion (n=2) or mutations (n=9), and resulted in unconfirmed partial responses in 4 patients, stable disease in 6 patients (two lasting >/=16 weeks) (JCO 39, 10009-10009(2021); NCT03899792). detail... detail... detail...
RET mutant thyroid gland medullary carcinoma sensitive Selpercatinib FDA approved - Has Companion Diagnostic Actionable In a Phase I/II trial (LIBRETTO-001) that supported FDA approval, Retevmo (selpercatinib) treatment resulted in an objective response rate (ORR) of 69% (38/55), with five complete and 33 partial responses, in adult and pediatric patients of 12 years and older with medullary thyroid cancer harboring RET mutations who were previously treated, while patients who had not been previously treated demonstrated an ORR of 73% (64/88), with ten complete and 54 partial responses (PMID: 32846061; NCT03157128). detail... detail... 32846061
RET mutant thyroid gland medullary carcinoma sensitive Selpercatinib Guideline Actionable Retevmo (selpercatinib) is included in guidelines for patients with medullary thyroid carcinoma harboring RET mutations (NCCN.org). detail...
RET mutant thyroid gland medullary carcinoma sensitive Selpercatinib Guideline Actionable Retevmo (selpercatinib) is included in guidelines for adult or pediatric patients 12 years or older with advanced medullary thyroid gland carcinoma harboring RET mutations (PMID: 31549998, PMID: 35491008; ESMO.org). 31549998 detail... 35491008
RET mutant Advanced Solid Tumor sensitive Ponatinib Preclinical - Cell line xenograft Actionable In a preclinical study, Iclusig (ponatinib) inhibited proliferation of cancer cell lines harboring RET mutations in cultured and in cell line xenograft models (PMID: 23526464). 23526464
RET mutant pheochromocytoma predicted - sensitive Sunitinib Case Reports/Case Series Actionable In a Phase II trial (SNIPP), a patient with pheochromocytoma harboring a germline RET mutation achieved a partial response to treatment with Sutent (sunitinib), and demonstrated a 64% reduction in tumor volume and remained on treatment for over 7 years (PMID: 31105270). 31105270
RET mutant Advanced Solid Tumor predicted - sensitive EP0031 Phase Ib/II Actionable In a Phase I/II trial (KL400-I/II-01), EP0031 treatment was well tolerated and demonstrated preliminary activity in patients with advanced solid tumors harboring mutations in RET, resulting in an objective response rate of 64%, with responses being observed in patients with non-small cell lung cancer, medullary thyroid cancer and pancreatic cancer (J Clin Oncol 41, 2023 (suppl 16; abstr 3007); NCT05265091). detail...
RET mutant cancer sensitive Sorafenib Preclinical Actionable In a preclinical study, Nexavar (sorafenib) inhibited wild-type RET and RET mutations to prevent cell proliferation in cell culture (PMID: 17664273). 17664273
RET act mut lung non-small cell carcinoma sensitive Ponatinib Preclinical - Cell culture Actionable In a preclinical study, Iclusig (ponatinib) inhibited RET phosphorylation and reduced viability of non-small cell lung cancer cells with RET activating mutations (Cancer Res April 15, 2013 73; 2084). detail...