The section 2 trial PrE0405 met its major endpoint, reaching an entire response (CR) fee of 85% in 33 sufferers over the age of 60 with mantle cell lymphoma (MCL) who obtained bendamustine and rituximab, a typical chemo-immunotherapy remedy, together with venetoclax, which is investigational on this setting. The mix was usually well-tolerated, a notable discovering based on Craig A. Portell, MD, who introduced the information for PrECOG, LLC, on the sixty fifth American Society of Hematology (ASH) Assembly and Exposition in San Diego, California, and nearly (Summary 733 in Session 623).
We’re inspired by the promising outcomes of research PrE0405 as a possible enchancment in first-line remedy for our older sufferers with mantle cell lymphoma.”
Dr. Craig A. Portell, lead investigator for the research and medical oncologist on the College of Virginia Complete Most cancers Heart
Mantle cell lymphoma is a type of non-Hodgkin lymphoma that extra typically impacts males and other people over age 60. Like all lymphomas, it impacts the lymphatic system, which incorporates the lymph nodes, spleen, and bone marrow.
Though mantle cell lymphoma is just not curable for most individuals, remedy can cut back the extent of the illness and put it into remission for years. Nonetheless, it’s a medical problem as a consequence of excessive relapse charges.
“With a median age of 60 to 70 years at analysis, many sufferers with mantle cell lymphoma are ineligible for aggressive therapies,” mentioned Dr. Portell. “In PrE0405, we noticed an 85% full response fee from a lower-intensity remedy.”
PrE0405
This single-arm section 2 trial aimed to guage the effectiveness of bendamustine and rituximab chemo-immunotherapy together with venetoclax (BR-VEN) as first-line remedy for sufferers over 60 with mantle cell lymphoma. The first evaluation was carried out on 33 sufferers enrolled between January 2020 and March 2022 by PrECOG investigators at a number of medical websites within the U.S. The median age of contributors was 71 years (vary 61 to 80), and 76% (n=25) have been male.
All sufferers had measurable or evaluable illness, outlined as a lymph node measuring >1.5 cm or a spleen malignancy of >15 cm. 9 sufferers (27%) had high-risk blastoid histology and 22 (67%) had high-risk MIPI scores. This means that sufferers enrolled have been at larger danger by these measures.
All sufferers obtained BR-VEN for six cycles (1 cycle = 28 days). Seven sufferers (21%) over age 75 obtained a decrease dose of bendamustine on the treating doctor’s discretion.
It is not uncommon amongst sufferers with mantle cell lymphoma to proceed with rituximab after preliminary remedy, and this was inspired on this trial per doctor discretion. Upkeep rituximab was administered in 19/33 sufferers (57%).
An interim evaluation was carried out after 19 sufferers enrolled to search for tumor lysis syndrome (TLS). TLS is brought on by the quick breakdown of most cancers cells, which may result in electrolyte and kidney issues. Laboratory proof of TLS was seen in 2/33 sufferers throughout Cycle 1 solely. Medical TLS was not seen.
The first endpoint was the PET-negative full response (CR) fee on the finish of remedy, utilizing the Lugano standards. This remedy was thought-about promising if ≥ 23 sufferers attained CR. An total response fee (CR and partial responses) was noticed in 97% (32/33). PET-negative bone marrow biopsies carried out on the finish of remedy confirmed a CR fee of 85% (28/33).
Therapy was usually effectively tolerated, although gastrointestinal (GI) toxicities have been widespread. Opposed occasions throughout remedy included lymphopenia (n=9, 27%), neutropenia (n=5, 15%), and thrombocytopenia (n=5, 15%). GI opposed occasions of all grades have been nausea/vomiting (n=26, 79%), fatigue (n=17, 52%), and diarrhea (n=10, 30%). Toxicities of Grade ≥3 occurred in 19 sufferers (58%).
Secondary endpoints embrace opposed occasion charges, total response fee, progression-free survival, and total survival. Testing for minimal residual illness (MRD) was carried out by next-generation sequencing on bone marrow specimens and peripheral blood samples collected on the finish of remedy.
Discuss with Summary 733 and Federal File NCT03834688 for additional particulars. This research was supported by Genentech, Member of the Roche Group.
