Variant | Gene | Type | COSMIC ID | DNA Change (Coding Nucleotide) | Exon |
---|---|---|---|---|---|
TP53 E204* | TP53 | nonsense | COSM10804 | 610G>T | 6 |
TP53 Y236* | TP53 | frameshift | 7 | ||
TP53 G245C | TP53 | missense | COSM11081 | 733G>T | 7 |
TP53 copy number loss | TP53 | CNV | |||
TP53 copy number gain | TP53 | CNV | |||
TP53 any deletion | TP53 | deletion | |||
TP53 any mutation | TP53 | any |
TP53 is a well known tumor suppressor gene that is mutated in wide variety of cancers. Loss of function mutations (missense, nonsense and frameshift mutations) of TP53 have been described in 10-20% of CLL cases and TP53 gene defects tend to be enriched among cases with unmutated IGH variable regions; in some series, TP53 mutations have been reported in approximately 15%-18% of IGHV unmutated CLL cases . TP53 mutations appears to be less common in other types of CLL (eg, less than 5% of IGHV3-21-expressing CLL carried a TP53 defect according to one study). Mutations of TP53 in CLL have been found together with del17p and mutations in other genes such as NOTCH1 and SF3B1. Mutations and deletions of TP53 appear to represent adverse prognostic markers in chronic lymphocytic leukemia.
Somatic mutations in TP53 are frequent in human cancer. Germline TP53 mutations cause of Li-Fraumeni syndrome, which is associated with a range of early-onset cancers. The types and positions of TP53 mutations are diverse. TP53 mutations may be potential prognostic and predictive markers in some tumor types, as well as targets for pharmacological intervention in some clinical settings. The IARC TP53 Database (http://www-p53.iarc.fr/) is a useful resource which catalogues TP53 mutations found in cancer.
Somatic mutations in TP53 are frequent in human cancer. Germline TP53 mutations cause of Li-Fraumeni syndrome, which is associated with a range of early-onset cancers. The types and positions of TP53 mutations are diverse. TP53 mutations may be potential prognostic and predictive markers in some tumor types, as well as targets for pharmacological intervention in some clinical settings. The IARC TP53 Database (http://www-p53.iarc.fr/) is a useful resource which catalogues TP53 mutations found in cancer.
Somatic mutations in TP53 are frequent in human cancer. Germline TP53 mutations cause of Li-Fraumeni syndrome, which is associated with a range of early-onset cancers. The types and positions of TP53 mutations are diverse. TP53 mutations may be potential prognostic and predictive markers in some tumor types, as well as targets for pharmacological intervention in some clinical settings. The IARC TP53 Database (http://www-p53.iarc.fr/) is a useful resource which catalogues TP53 mutations found in cancer.
Somatic mutations in TP53 are frequent in human cancer. Germline TP53 mutations cause of Li-Fraumeni syndrome, which is associated with a range of early-onset cancers. The types and positions of TP53 mutations are diverse. TP53 mutations may be potential prognostic and predictive markers in some tumor types, as well as targets for pharmacological intervention in some clinical settings. The IARC TP53 Database (http://www-p53.iarc.fr/) is a useful resource which catalogues TP53 mutations found in cancer.
P53 activates the transcription of genes involved in cell cycle arrest, DNA repair, and apoptosis. Deletion and point mutation at the TP53 locus occur in 25%-40% and 5%-40% of prostate cancer, respectively. Although the frequency of p53 mutations seems to be lower in prostate cancer than in other cancers, these alterations are not exclusively late events, as they have been shown in 25% to 30% of clinically localized prostate cancer. Several studies indicate that p53 overexpression may be associated with poor prognosis, especially when present in combination with Bcl2. Interestingly, SPOP mutations are also mutually exclusive with deletions and mutations in the TP53 tumor suppressor.
Somatic mutations in TP53 are frequent in human cancer. Germline TP53 mutations cause of Li-Fraumeni syndrome, which is associated with a range of early-onset cancers. The types and positions of TP53 mutations are diverse. TP53 mutations may be potential prognostic and predictive markers in some tumor types, as well as targets for pharmacological intervention in some clinical settings. The IARC TP53 Database (http://www-p53.iarc.fr/) is a useful resource which catalogues TP53 mutations found in cancer.
TP53 is a well known tumor suppressor gene that is mutated in wide variety of cancers. In terms of myeloid disorders, missense, nonsense, and frameshift mutations of TP53 tend to occur in the DNA binding domain and have been reported in approximately 4% of cases of AML where they tend to be associated with a poorer prognosis and an adverse cytogenetic risk profile. TP53 mutations also occur in approximately 10% of patients with myelodysplastic syndrome (MDS) and are often associated with poorer prognosis, adverse cytogenetic profile and deletion of 5q either in isolation or as part of a complex karyotype.
TP53 is a well known tumor suppressor gene that is mutated in wide variety of cancers. Among cases of acute lymphoblastic leukemia, overall TP53 mutations are reported to occur in less than 10% of cases. However, TP53 mutations have a very high prevalence (approximately 90%) among cases of ALL with low hypodiploid karyotype and in this setting are often associated with monosomy 17 and may be associated with germline TP53 mutations in a significant proportion of such cases in children.
This gene is a known cancer gene.
Somatic mutations in TP53 are frequent in human cancer. Germline TP53 mutations cause of Li-Fraumeni syndrome, which is associated with a range of early-onset cancers. The types and positions of TP53 mutations are diverse. TP53 mutations may be potential prognostic and predictive markers in some tumor types, as well as targets for pharmacological intervention in some clinical settings. The IARC TP53 Database (http://www-p53.iarc.fr/) is a useful resource which catalogues TP53 mutations found in cancer.
TP53 encodes p53, a tumor suppressor protein that consists of transactivation domain, proline-rich domain, DNA-binding domain, oligomerization domain, and regulatory domain. p53 responds to diverse cellular stresses to maintain genomic stability and to induce cell cycle arrest, apoptosis, DNA repair and metabolic changes. TP53 mutations represent an important mechanism of resistance to DNA-damaging chemotherapeutic agents. Somatic TP53 mutations are found in a variety of cancers with various frequencies depending on cancer type; overall, TP53 is mutated in over one-half of human cancers. Missense mutations were the most frequent (~70-80%), followed by frameshift and nonsense mutations. Most TP53 mutations are clustered in the DNA-binding domain encompassing exons 5 and 8. These mutations either directly disrupt the DNA-binding domain of TP53 or cause conformational changes of the TP53 protein, thus leading to severely impaired TP53 function. Overall in myeloid malignancies, TP53 mutations are found in 5% to 15% of de novo MDS and AML but 20% of myelodysplastic syndrome with isolated del(5q) and ~50% of MDS/AML with complex karyotype. TP53 mutations are also more frequent in therapy-associated myeloid neoplasm (21-38%) compared to de novo MDS and AML. TP53 mutations are also found in 8% of blastic plasmacytoid dendritic cell neoplasm, and less than 5% in myeloproliferative neoplasms (ET, PV and PMF) and chronic myelomonocytic leukemia. TP53 mutations are independently associated with a poor prognosis in myelodysplastic syndrome (NCCN Guidelines for Myelodysplastic Syndromes) and is a poor risk factor in AML (NCCN Guildelines for AML). TP53 mutations are also associated with resistance to lenalidomide or relapse during lenalidomide treatment. TP53 mutations are independently associated with unfavorable outcomes and shorter survival after hematopoietic stem cell transplantation in patients with myelodysplastic syndrome and myelodysplastic syndrome/acute myeloid leukemia, but an increased response to decitabine in patients with myelodysplastic syndrome or acute myeloid leukemia.
FGFR3 has been found to be mutated in up to 64% of cases of bladder cancer; FGFR3 mutations tend to be exclusive of RAS mutations ,TP53 overexpression, TP53 mutation, but not PIK3CA mutations. However, subsets of cases with co-mutations have been described. FGFR3 mutations (including Y373C) are believed to lead to constitutive activation of the receptor and activation of the RAS-MAPK pathway. FGFR3 mutations are often seen in non-muscle invasive bladder cancers and tend to correlate with low stage and grade; however FGFR3 mutations have also been described in muscle-invasive bladder cancer. Targeted therapies with FGFR3 inhibitors have been explored in patients with bladder cancer.
NOTCH1 mutations have also recently been reported in approximately 10% of chronic lymphocytic leukemia and are typically PEST domain mutations in that disease. In CLL, NOTCH1 mutations and tend to be exlusive of SF3B1 mutations and possibly TP53 mutations, although some studies demonstrate that NOTCH1 mutations are associated with mutations of TP53. In CLL, the presence of NOTCH1 mutations has been associated with trisomy 12 and aggressive biologic features(CD38+, ZAP70+, unmutated IgH variable region) and adverse prognosis in some settings. The potential utility of therapeutic targeting of activating NOTCH1 mutations in these diseases remains to be elucidated.
Balversa (erdafitinib) has been FDA approved for treatment of urothelial carcinoma with susceptible FGFR3 or FGFR2 genetic alterations. FGFR3 is a receptor tyrosine kinase in the RAS-MAPK and PI3K-AKT pathways. FGFR3 has been found to be mutated in up to 64% of cases of bladder cancer and 40% of upper urothelial tract (ureter and renal pelvis) urothelial carcinomas. FGFR3 mutations tend to be exclusive of RAS mutations ,TP53 overexpression, TP53 mutation, but not PIK3CA mutations. However, subsets of cases with co-mutations have been described. Gain of function FGFR3 mutations (including FGFR3 R248C and FGFR3 S249C) are believed to lead to constitutive activation of the receptor and activation of the RAS-MAPK pathway. FGFR3 mutations are often seen in non-muscle invasive bladder cancers and tend to correlate with low stage and grade; however, FGFR3 mutations have also been described in muscle-invasive bladder cancer.
MDM2 encodes an E3 ubiquitin ligase that regulates tumor suppressor protein (eg, TP53) turnover through proteasomal degradation. MDM2 overexpression or amplification has been detected in a variety of different cancers including a subset of bladder cancer. Small molecular inhibitors of the MDM2:p53 axis are currently in early phase clinical trials for a number of malignancies.
Homozygous mutations causing SMAD4 loss are found in approximately 3% of lung adenocarcinomas and squamous cell carcinomas cases. SMAD4 loss tends to act synergistically with TP53 and KRAS mutations to increase lymphatic metastasis and tumor size. Experimental work in a mouse model has demonstrated increased susceptibility to DNA topoisomerase inhibitors with homozygous SMAD4 loss of function mutation coupled with KRAS G12D activating mutations.
Recurrent inactivating mutations in Kruppel-like factor 2 (KLF2),have been reported in approximately 40% of splenic marginal zone lymphomas (SMZL) but are rarely present in other B-cell lymphomas, according to one study. The majority of KLF2 mutations were frameshift indels or nonsense changes, with missense mutations clustered in the C-terminal zinc finger domains. Functional assays showed that these mutations inactivated the ability of KLF2 to suppress NF-κB activation. IGHV1-2 rearrangement and 7q deletion were primarily seen in SMZL with KLF2 mutation, while MYD88 and TP53 mutations were nearly exclusively found in those without KLF2 mutation. NOTCH2, TRAF3, TNFAIP3 and CARD11 mutations were observed in SMZL both with and without KLF2 mutation. The prognostic and therapeutic implications, if any, of KLF2 alterations in SMZL has yet to be fully elucidated.