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Gene RB1
Variant V654fs
Impact List frameshift
Protein Effect loss of function - predicted
Gene Variant Descriptions RB1 V654fs results in a change in the amino acid sequence of the Rb1 protein beginning at aa 654 of 928, likely resulting in premature truncation of the functional protein (UniProt.org). Due to the loss of multiple functional domains (UniProt.org), V654fs is predicted to lead to a loss Rb1 protein function.
Associated Drug Resistance
Category Variants Paths

RB1 mutant RB1 inact mut RB1 V654fs

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Transcript NM_000321.3
gDNA chr13:g.(48456348_48456349)
cDNA c.(1960_1959)
Protein p.V654fs
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_000321.3 chr13:g.(48456348_48456349) c.(1960_1959) p.V654fs RefSeq GRCh38/hg38
NM_000321 chr13:g.(48456348_48456349) c.(1960_1959) p.V654fs RefSeq GRCh38/hg38
NM_000321.2 chr13:g.(48456348_48456349) c.(1960_1959) p.V654fs RefSeq GRCh38/hg38
NM_001407165.1 chr13:g.(48456348_48456349) c.(1960_1959) p.V654fs RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
RB1 inact mut retinoblastoma sensitive Fostamatinib Preclinical Actionable In a preclinical study, retinoblastoma cell lines demonstrated sensitivity to Fostamatinib resulting in cell death (PMID: 22237022). 22237022
RB1 inact mut glioblastoma resistant Palbociclib Preclinical - Cell line xenograft Actionable In a preclinical study, Ibrance (palbociclib) failed to inhibit growth of RB1-deficient glioblastoma cell lines in culture and in intracranial cell line xenograft models (PMID: 20354191). 20354191
RB1 inact mut retinoblastoma sensitive Nutlin-3a Preclinical Actionable In a preclinical study, Nutlin-3a induced p53 pathway signaling in MDMX mouse models with retinoblastoma and 69% (70/102) of the eyes harvested from the mouse models demonstrated complete response or stable disease after 18 weeks of therapy (PMID: 21515735). 21515735
RB1 inact mut retinoblastoma sensitive BAY 61-3606 Preclinical Actionable In a preclinical study, a retinoblastoma cell line was sensitive to BAY 61-3606 in cell culture and in xenograft models, demonstrating increased apoptosis (PMID: 22237022). 22237022
RB1 mutant estrogen-receptor positive breast cancer predicted - resistant Palbociclib Phase III Actionable In a Phase III trial (PALOMA-3), acquired RB1 mutations were identified in patents with ER-positive, ERBB2 (HER2)-negative breast cancer at the end of treatment in the Faslodex (fulvestrant) plus Ibrance (palbociclib) but not the Faslodex (fulvestrant) plus placebo arm, suggesting a role in conferring resistance to Ibrance (palbociclib) (PMID: 30206110; NCT01942135). 30206110
RB1 mutant osteosarcoma sensitive VCN-01 Preclinical - Cell line xenograft Actionable In a preclinical study, VCN-01 decreased viability of a human RB1-mutant primary osteosarcoma cell line in culture, and inhibited tumor growth and decreased lung metastases in xenograft models (PMID: 26603261). 26603261