idelalisib
Regulatory sources consulted
Approved indications
- With rituximab: chronic lymphocytic leukemia in adults after at least one prior treatment, or first-line with 17p deletion or TP53 mutation when unsuitable for any other therapy. As monotherapy: follicular lymphoma in adults refractory to two prior lines.
Contraindications
Absolute
- Hypersensitivity to idelalisib or excipients.
Clinical warnings
- Do not start with an active systemic infection. Provide Pneumocystis prophylaxis throughout treatment and for 2–6 months afterward; monitor CMV, PML, and opportunistic infections. Check blood counts every 2 weeks for the first 6 months and weekly if ANC is <1,000/mm³. — CIMA/AEMPS, ficha técnica 114938001
- It can cause hepatotoxicity, severe diarrhea or colitis, pneumonitis or organizing pneumonia, and severe cutaneous reactions. Check ALT, AST, and bilirubin every 2 weeks for the first 3 months and modify or discontinue according to severity. — CIMA/AEMPS, ficha técnica 114938001
Drug interactions
- HighModerate or strong CYP3A inducers
Mechanism: They reduce idelalisib exposure and may decrease efficacy.
Recommendation: Avoid the combination, including St John’s wort.
CIMA/AEMPS, ficha técnica 114938001
- HighSensitive CYP3A substrates
Mechanism: The idelalisib metabolite strongly inhibits CYP3A and may greatly increase substrate exposure.
Recommendation: Avoid contraindicated or narrow-therapeutic-index substrates and apply the concomitant drug label’s dose reduction and monitoring.
CIMA/AEMPS, ficha técnica 114938001
Adverse events
Common (≥1%)
infections · neutropenia · diarrhea or colitis · increased transaminases · rash · pyrexia · increased triglycerides
Rare but serious
Stevens-Johnson syndrome or toxic epidermal necrolysis
Pregnancy and lactation
It is not recommended during pregnancy. Use highly effective contraception during treatment and for 1 month afterward; if the method is hormonal, add a barrier method. Discontinue breastfeeding during treatment.
Recent literature (PubMed)
Chronic lymphocytic leukemia (CLL), defined by a minimum of 5 × 109/L monoclonal B cells in the blood, affects more than 200 000 people and is associated with approximately 4410 deaths in the US annually. CLL is associated with an immunocompromised state and an increased rate of complications from infections. At the time of diagnosis, the median age of patients with CLL is 70 years, and an estimated 95% of patients have at least 1 medical comorbidity. Approximately 70% to 80% of patients with CLL are asymptomatic at the time of diagnosis, and one-third will never require treatment for CLL. Prognostic models have been developed to estimate the time to first treatment and the overall survival, but for patients who are asymptomatic, irrespective of disease risk category, clinical observation is the standard of care. Patients with symptomatic disease who have bulky or progressive lymphadenopathy or hepatosplenomegaly and those with a low neutrophil count, anemia, or thrombocytopenia and/or symptoms of fever, drenching night sweats, and weight loss (B symptoms) should be offered treatment. For these patients, first-line treatment consists of a regimen containing either a covalent Bruton tyrosine kinase (BTK) inhibitor (acalabrutinib, zanubrutinib, or ibrutinib) or a B-cell leukemia/lymphoma 2 (BCL2) inhibitor (venetoclax). There is no evidence that starting either class before the other improves outcomes. The covalent BTK inhibitors are typically used indefinitely. Survival rates are approximately 88% at 4 years for acalabrutinib, 94% at 2 years for zanubrutinib, and 78% at 7 years for ibrutinib. Venetoclax is prescribed in combination with obinutuzumab, a monoclonal anti-CD20 antibody, in first-line treatment for 1 year (overall survival, 82% at 5-year follow-up). A noncovalent BTK inhibitor, pitobrutinib, has shown an overall response rate of more than 70% after failure of covalent BTK inhibitors and venetoclax. Phosphoinositide 3'-kinase (PI3K) inhibitors (idelalisib
Pirtobrutinib, a noncovalent, Bruton tyrosine kinase inhibitor (BTKi), has shown clinical efficacy and a favorable safety profile. BRUIN CLL-321 was an open-label, randomized phase III study conducted exclusively in patients with R/R chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL) previously treated with cBTKi, and compared pirtobrutinib with investigator's choice (IC) of idelalisib/rituximab (IdelaR) or bendamustine/rituximab (BR). Patients were randomly assigned 1:1 to receive pirtobrutinib (200 mg once daily) or IC of IdelaR or BR, and were stratified by previous use of venetoclax and del(17p). The primary end point was independent review committee-assessed progression-free survival (PFS). Secondary end points included time to next treatment or death (TTNT), overall survival (OS), and safety. The primary PFS end point was met at the time of the primary analysis (August 29, 2023), and updated results are reported from the final OS analysis (August 29, 2024). A total of 238 patients were randomly assigned to receive pirtobrutinib (n = 119) or IC (n = 119; IdelaR [n = 82], BR [n = 37]). The PFS hazard ratio (HR) was 0.54 ([95% CI, 0.39 to 0.75]; P = .0002), with a median PFS of 14 months (95% CI, 11.2 to 16.6) in the pirtobrutinib group and 8.7 months (95% CI, 8.1 to 10.4) with IC. The unadjusted OS HR was 1.09 ([95% CI, 0.68 to 1.75]; P = .7202), and 18-month OS rate was 73.4% (95% CI, 63.9 to 80.7) in the pirtobrutinib group and 70.8% (95% CI, 60.9 to 78.7) with IC. Median TTNT was 24 months (95% CI, 17.8 to 29.7) with pirtobrutinib versus 10.9 months (95% CI, 8.7 to 12.5) with IC (HR, 0.37 [95% CI, 0.25 to 0.52]). At a median follow-up of 17.2 months, grade ≥3 treatment-emergent adverse events (AEs) were lower with pirtobrutinib (57.7%) than IC (73.4%). Treatment discontinuation due to AE occurred in 20 (17.2%) patients receiving pirtobrutinib and 38 (34.9%) patients receiving IC. Pirtobrutinib improved PFS and TTNT, and demonstrated favorable
Autoimmune phenomena, particularly autoimmune cytopenias (AIC), are common complications in patients with chronic lymphocytic leukemia (CLL), arising from the interplay of predisposing genetic and immunologic conditions and extrinsic triggering factors, such as infections and drugs. In this article, we provide insights into the pathogenesis of CLL-associated AIC, discuss diagnostic criteria and treatment recommendations, and present the most recent data on the impact of targeted agents on the management of AIC.
Bruton tyrosine kinase inhibitors (BTKis) have led to changes in the treatment algorithm for patients with high-risk relapsed/refractory (R/R) chronic lymphocytic leukemia (CLL), defined based on the presence of genetic mutations. Given the lack of head-to-head trials comparing next-generation BTKis used to treat high-risk R/R disease, a network meta-analysis (NMA) was performed to estimate their relative efficacy. High-risk populations were defined based on the prespecified definitions within each trial, including patients with del(17p) and/or TP53 mutations in the ALPINE (n = 150) and ASCEND (n = 86) trials, and del(17p)/del(11q) in the ELEVATE-RR (n = 533) trial. Bayesian NMAs found zanubrutinib to be the most efficacious treatment for high-risk patients, with significantly reduced risk of progression or death compared with ibrutinib (hazard ratio [HR], 0.49; 95% credible interval [CrI], 0.31-0.78), acalabrutinib (HR, 0.55; 95% CrI, 0.32-0.94), and bendamustine + rituximab or idelalisib + rituximab (BR/IR; HR, 0.12; 95% CrI, 0.05-0.26). Differences in overall survival demonstrated a numerical trend favoring zanubrutinib (probability better than ≥80%) compared with ibrutinib (HR, 0.59; 95% CrI, 0.31-1.11), acalabrutinib (HR, 0.72; 95% CrI, 0.35-1.50), and BR/IR (HR, 0.65; 95% CrI, 0.23-1.75). Rates of response also demonstrated trends favoring zanubrutinib compared with acalabrutinib, with significant results compared with ibrutinib. The NMA suggests that the most efficacious BTKi for patients with high-risk R/R CLL is zanubrutinib.