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Gene RB1
Variant W75*
Impact List nonsense
Protein Effect loss of function - predicted
Gene Variant Descriptions RB1 W75* results in a premature truncation of the Rb1 protein at amino acid 75 of 928 (UniProt.org). Due to the loss of all known functional domains (UniProt.org), W75* is predicted to lead to a loss of Rb1 protein function.
Associated Drug Resistance
Category Variants Paths

RB1 mutant RB1 inact mut RB1 W75*

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Transcript NM_000321.3
gDNA chr13:g.48307366G>A
cDNA c.224G>A
Protein p.W75*
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_000321.3 chr13:g.48307366G>A c.224G>A p.W75* RefSeq GRCh38/hg38
NM_001407166.1 chr13:g.48307366G>A c.224G>A p.W75* RefSeq GRCh38/hg38
NM_001407167.1 chr13:g.48307366G>A c.224G>A p.W75* RefSeq GRCh38/hg38
NM_001407165.1 chr13:g.48307366G>A c.224G>A p.W75* RefSeq GRCh38/hg38
NM_000321.2 chr13:g.48307366G>A c.224G>A p.W75* 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 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 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 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