2017 notches up some landmark approvals

Ovarian/fallopian tube cancers

PARP inhibitors. For patients with ovarian/fallopian tube cancer, there are new indications and agents for PARP inhibition, including for patients with BRCA mutations (both somatic and germline) and those without BRCA mutations.

Olaparib (Lynparza) was previously approved only in a fourth-line setting for germline BRCA-mutated patients with advanced ovarian cancer, with a response rate of 34% with a median duration of 7.9 months. Given at 300 mg orally bid, it is now approved for use in maintenance in recurrence after response to platinum-based chemotherapy after 2 or more lines of therapy regardless of BRCA status. In this setting, progression-free survival increased to 8.4 months, compared with 4.8 months for placebo.⁸

Rubicarib (Rubraca) is approved for BRCA-mutated patients (either germline or somatic) with advanced ovarian cancer after two or more lines of chemotherapy.⁹ At 600 mg orally bid, results from phase 2 trials noted a 54% response rate, with a median duration of 9.2 months.

Niraparib (Zejula) is approved for use in maintenance in recurrent epithelial ovarian, fallopian tube, and primary peritoneal cancers after platinum-based chemotherapy.¹⁰ In patients with germline BRCA mutations, niraparib at 300 mg orally daily resulted in a PFS of 21 months, compared with 5.5 months with placebo; PFS in patients with nongermline BRCA mutations was 9.3 versus 3.9 months, respectively.
 

Non-small cell lung cancer with EML-4 alk translocation

Crizotinib (Xalkori) has been the mainstay for treatment of for EML4-alk translocated non-small cell lung cancer. However, alectinib (Alcensa), previously for predominantly second-line use, seems more active than crizotinib in the first-line setting, particularly in the treatment and prevention of CNS metastases.

In addition, brigantinib (Alunbrig) has been approved for patients who are intolerant/refractory to crizotinib.¹¹ At 90 mg once daily for 7 days, then escalating to 180 mg daily, it was noted to have a 50% response rate in crizotinib failures, including in the CNS.
 

Ceritinib (Zykadia) was approved at 750 mg once daily for EML4 alk positive NSCLC.¹² In first line it had a response rate of 73% (versus 27% for chemotherapy) with a remission duration of 23.9 months (versus 11.1 months for chemotherapy).
 

Therapies by drug class

PD-1/PD-L1 antibodies

Anti-PD-1 antibodies nivolumab (Opdivo) and pembrolizumab (Keytruda) are widely used for a range of tumor types. Newer approvals for pembrolizumab are for adenocarcinoma of the stomach/gastro-esophageal junction with at least 1% PD-L1 expression, and in any tumor demonstrated to be MSI-high. Newer indications for nivolumab are for bladder cancer, MSI-high colon cancer, and for hepatoma previously treated with sorafenib. The anti-PD-L1 antibody atezolizumab (Tencentriq) is now approved for platinum-resistant metastatic lung cancer, in addition to platinum-ineligible and platinum-resistant urothelial cancer.

Avelumab (Bavencio) is an anti-PD-L1 approved for both Merkel cell and previously treated urothelial cancers at a dose of 10 mg/kg every 2 weeks.¹³ It demonstrated a 33% response rate for Merkel cell and a 16% response rate for urothelial cancer.

Durvalumab (Imfinzi) is another anti PD-L1 antibody approved at 10 mg/kg every 2 weeks for previously treated urothelial cancer with a 17% response rate (RR: PD-L1 high, 26%; low, 4%).¹⁴

PI3K kinase inhibitors

Copanlisib (Aliqopa) is a PI3K inhibitor approved for relapsed follicular lymphoma in patients who have progressed after two previous lines of therapy.¹⁵ It is a 60-mg, 1-hour infusion given on days 1, 8, and 15 every 28 days. In a phase 2 trial, it had a 59% response rate (14% complete response) and a median response duration of 12.2 months.

BTK inhibitors

Acalabruitnib (Calquence) is approved for adults with previously treated mantle cell lymphoma. In a phase 2 trial at 100 mg orally bid, it achieved an 80% overall and 40% complete response rate.¹⁶ These response rates are higher than were seen for ibrutinib in its original phase 2 trial. The spectrum of toxicities seems similar to ibruitinib and includes bleeding, cytopenias, infection, and atrial fibrillation.

CD19 CAR-T cells

Perhaps the most exciting and novel new agents are genetically engineered autologous T cells. Tisagenlecleucel (Kymriah), a chimeric antigen receptor T cell (CART) that targets CD19 is approved for refractory B cell precursor acute lymphoblastic leukemia (in patients under 25 years) where the complete response rate was 83% (including patients with incomplete blood count recovery).¹⁷

Axicabtagene ciloleucel (aci-cel; Yescarta), also CD19-directed CART, is approved for adults with relapsed or refractory non-Hodgkin lymphoma after two lines of previous therapy (specifically large-cell lymphoma, primary mediastinal large B-cell lymphoma, and transformed follicular lymphoma). Response rate was 72% (complete, 51%; partial, 21%), with a median duration of response of 9.2 months.¹⁸