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| Ref Type | Journal Article | ||||||||||||
| PMID | (29906251) | ||||||||||||
| Authors | Pietanza MC, Waqar SN, Krug LM, Dowlati A, Hann CL, Chiappori A, Owonikoko TK, Woo KM, Cardnell RJ, Fujimoto J, Long L, Diao L, Wang J, Bensman Y, Hurtado B, de Groot P, Sulman EP, Wistuba II, Chen A, Fleisher M, Heymach JV, Kris MG, Rudin CM, Byers LA | ||||||||||||
| Title | Randomized, Double-Blind, Phase II Study of Temozolomide in Combination With Either Veliparib or Placebo in Patients With Relapsed-Sensitive or Refractory Small-Cell Lung Cancer. | ||||||||||||
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| Abstract Text | Purpose Both temozolomide (TMZ) and poly (ADP-ribose) polymerase (PARP) inhibitors are active in small-cell lung cancer (SCLC). This phase II, randomized, double-blind study evaluated whether addition of the PARP inhibitor veliparib to TMZ improves 4-month progression-free survival (PFS). Patients and Methods A total of 104 patients with recurrent SCLC were randomly assigned 1:1 to oral veliparib or placebo 40 mg twice daily, days 1 to 7, and oral TMZ 150 to 200 mg/m2/day, days 1 to 5, of a 28-day cycle until disease progression, unacceptable toxicity, or withdrawal of consent. Response was determined by imaging at weeks 4 and 8, and every 8 weeks thereafter. Improvement in PFS at 4 months was the primary end point. Secondary objectives included overall response rate (ORR), overall survival (OS), and safety and tolerability of veliparib with TMZ. Exploratory objectives included PARP-1 and SLFN11 immunohistochemical expression, MGMT promoter methylation, and circulating tumor cell quantification. Results No significant difference in 4-month PFS was noted between TMZ/veliparib (36%) and TMZ/placebo (27%; P = .19); median OS was also not improved significantly with TMZ/veliparib (8.2 months; 95% CI, 6.4 to 12.2 months; v 7.0 months; 95% CI, 5.3 to 9.5 months; P = .50). However, ORR was significantly higher in patients receiving TMZ/veliparib compared with TMZ/placebo (39% v 14%; P = .016). Grade 3/4 thrombocytopenia and neutropenia more commonly occurred with TMZ/veliparib: 50% versus 9% and 31% versus 7%, respectively. Significantly prolonged PFS (5.7 v 3.6 months; P = .009) and OS (12.2 v 7.5 months; P = .014) were observed in patients with SLFN11-positive tumors treated with TMZ/veliparib. Conclusion Four-month PFS and median OS did not differ between the two arms, whereas a significant improvement in ORR was observed with TMZ/veliparib. SLFN11 expression was associated with improved PFS and OS in patients receiving TMZ/veliparib, suggesting a promising biomarker of PARP-inhibitor sensitivity in SCLC. | ||||||||||||
| Molecular Profile | Treatment Approach |
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| Gene Name | Source | Synonyms | Protein Domains | Gene Description | Gene Role |
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| Therapy Name | Drugs | Efficacy Evidence | Clinical Trials |
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| Drug Name | Trade Name | Synonyms | Drug Classes | Drug Description |
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| Gene | Variant | Impact | Protein Effect | Variant Description | Associated with drug Resistance |
|---|---|---|---|---|---|
| ATM | D2725G | missense | unknown | ATM D2725G lies within the PI3K/PI4K domain of the Atm protein (UniProt.org). D2725G has been identified in the scientific literature (PMID: 29906251, PMID: 28188106), but has not been biochemically characterized and therefore, its effect on Atm protein function is unknown (PubMed, Mar 2025). | |
| ATM | V410A | missense | unknown | ATM V410A does not lie within any known functional domains of the Atm protein (UniProt.org). V410A has been identified in the scientific literature (PMID: 29906251, PMID: 25148578, PMID: 14695997), but has not been biochemically characterized and therefore, its effect on Atm protein function is unknown (PubMed, Oct 2024). |
| Molecular Profile | Indication/Tumor Type | Response Type | Therapy Name | Approval Status | Evidence Type | Efficacy Evidence | References |
|---|---|---|---|---|---|---|---|
| ATM D2725G | lung small cell carcinoma | predicted - sensitive | Temozolomide + Veliparib | Case Reports/Case Series | Actionable | In a Phase II trial, Temodar (temozolomide) and Veliparib (ABT-888) combination treatment resulted in partial response in a patient with small cell lung cancer harboring ATM D2725G, with a progression-free survival of 9 months and an overall survival of 16 months (PMID: 29906251; NCT01638546). | 29906251 |
| ATM V410A | lung small cell carcinoma | predicted - sensitive | Temozolomide + Veliparib | Case Reports/Case Series | Actionable | In a Phase II trial, Temodar (temozolomide) and Veliparib (ABT-888) combination treatment resulted stable disease in a patient with small cell lung cancer harboring ATM V410A, with a progression-free survival of 6.3 months and an overall survival of 6.3 months (PMID: 29906251; NCT01638546). | 29906251 |
| ATM S333F | lung small cell carcinoma | predicted - sensitive | Temozolomide + Veliparib | Case Reports/Case Series | Actionable | In a Phase II trial, Temodar (temozolomide) and Veliparib (ABT-888) combination treatment resulted stable disease in a patient with small cell lung cancer harboring ATM S333F, with a progression-free survival of 4.2 months and an overall survival of 4.2 months (PMID: 29906251; NCT01638546). | 29906251 |