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Gene RB1
Variant R661W
Impact List missense
Protein Effect unknown
Gene Variant Descriptions RB1 R661W lies within the B domain of the Rb1 protein (UniProt.org). R661W results in growth suppression similar to wild-type Rb1 (PMID: 9342358, PMID: 15688068) but results in loss of transcriptional repression (PMID: 8524800), decreased induction of G0/G1 block and p27 expression, reduced downregulation of cyclin E in cultured cells (PMID: 17163992), decreased binding to large T antigen in a yeast two-hybrid assay (PMID: 9342358), and fails to bind E2f1 in in vitro assays (PMID: 9342358, PMID: 15688068), and therefore, its effect on Rb1 protein function is unknown.
Associated Drug Resistance
Category Variants Paths

RB1 mutant RB1 R661W

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Transcript NM_000321.3
gDNA chr13:g.48459708C>T
cDNA c.1981C>T
Protein p.R661W
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
NM_000321 chr13:g.48459708C>T c.1981C>T p.R661W RefSeq GRCh38/hg38
NM_001407165.1 chr13:g.48459708C>T c.1981C>T p.R661W RefSeq GRCh38/hg38
NM_000321.3 chr13:g.48459708C>T c.1981C>T p.R661W RefSeq GRCh38/hg38
NM_000321.2 chr13:g.48459708C>T c.1981C>T p.R661W RefSeq GRCh38/hg38

Filtering

  • Case insensitive filtering will display rows if any text in any cell matches the filter term
  • Use simple literal full or partial string matches
  • Separate multiple filter terms with a space. Any order may be used (i. e. a b c and c b a are equivalent )
  • Filtering will only apply to rows that are already loaded on the page. Filtering has no impact on query parameters.
  • Use quotes to match on a longer phrase with spaces (i.e. "mtor c1483f")

Sorting

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
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
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