Pembrolizumab

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Pembrolizumab
Pembrolizumab 5DK3.png
From PDB entry 5dk3
Monoclonal antibody
Type Whole antibody
Source Humanized (from mouse)
Target PD-1
Clinical data
Trade names Keytruda
Other namesMK-3475, lambrolizumab
AHFS/Drugs.com Monograph
MedlinePlus a614048
License data
Pregnancy
category
Routes of
administration 		Intravenous
Drug class Antineoplastic agent
ATC code
Legal status
Legal status
Identifiers
CAS Number
DrugBank
ChemSpider
  • none
UNII
KEGG
ChEMBL
ECHA InfoCard 100.234.370 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C6534H10004N1716O2036S46
Molar mass 146648.64 g·mol−1

Pembrolizumab, sold under the brand name Keytruda, is a humanized antibody, more specifically a PD-1 Inhibitor, used in cancer immunotherapy that treats melanoma, lung cancer, head and neck cancer, Hodgkin lymphoma, stomach cancer, cervical cancer, and certain types of breast cancer. [12] [14] [15] [16] It is administered by slow intravenous injection. [15]

Contents

Common side effects include fatigue, musculoskeletal pain, decreased appetite, itchy skin (pruritus), diarrhea, nausea, rash, fever (pyrexia), cough, difficulty breathing (dyspnea), constipation, pain, and abdominal pain. [17] [15] It is an IgG4 isotype antibody that blocks a protective mechanism of cancer cells, allowing the immune system to destroy them. It targets the programmed cell death protein 1 (PD-1) receptor of lymphocytes. [17]

Pembrolizumab was approved for medical use in the United States in 2014. [15] It is on the World Health Organization's List of Essential Medicines. [18]

Medical uses

Micrograph showing a PD-L1 positive non-small cell lung carcinoma. PD-L1 immunostain PD-L1 positive lung adenocarcinoma -- intermed mag.jpg
Micrograph showing a PD-L1 positive non-small cell lung carcinoma. PD-L1 immunostain

As of 2019, pembrolizumab is used via intravenous infusion to treat inoperable or metastatic melanoma, metastatic non-small cell lung cancer (NSCLC) in certain situations, as a first-line treatment for metastatic bladder cancer in patients who cannot receive cisplatin-based chemotherapy and have high levels of PD-L1, as a second-line treatment for head and neck squamous cell carcinoma (HNSCC), after platinum-based chemotherapy, for the treatment of adult and pediatric patients with refractory classic Hodgkin's lymphoma (cHL), and recurrent locally advanced or metastatic esophageal squamous cell carcinoma. [12] [19] [20] [21] [22] [23] [24] [25]

For non-small cell lung cancer, pembrolizumab is used in combination with chemotherapy (for all PD-L1, a PD-1 receptor ligand, levels) or by itself as a first-line treatment if the cancer expresses (≥ 1%) PD-L1 and the cancer has no mutations in EGFR or in ALK; if chemotherapy has already been administered, then pembrolizumab can be used as a second-line treatment, but if the cancer has EGFR or ALK mutations, agents targeting those mutations should be used first. [12] [26] Assessment of PD-L1 expression must be conducted with a validated and approved companion diagnostic. [12] [23]

Pembrolizumab (Pembro) use for treatment of Lung cancer in the first line with or without chemotherapy (Chemo). Median overall survival in months (M). Hazard Ratio (HR). Pembrolizumab results as in Lung cancer keynote studies KEYNOTE-024 KEYNOTE-042 KEYNOTE-189 KEYNOTE-407.jpg
Pembrolizumab (Pembro) use for treatment of Lung cancer in the first line with or without chemotherapy (Chemo). Median overall survival in months (M). Hazard Ratio (HR).

In 2017, the US Food and Drug Administration approved pembrolizumab for any unresectable or metastatic solid tumor with certain genetic anomalies (mismatch repair deficiency or microsatellite instability). [23] [28] This was the first time the FDA approved a cancer drug based on tumor genetics rather than tissue type or tumor site;[ medical citation needed ] therefore, pembrolizumab is a so-called tissue-agnostic drug. [29]

In the European Union, pembrolizumab is indicated for:

In June 2020, the US FDA approved a new indication for pembrolizumab as the first-line treatment for people with unresectable or metastatic microsatellite instability-high (MSI‑H) or mismatch repair deficient (dMMR) colorectal cancer. [17] The approval marks the first immunotherapy approved for that population in the US as a first-line treatment and which is administered to people without also giving chemotherapy. [17]

In March 2021, the US FDA approved pembrolizumab in combination with platinum and fluoropyrimidine-based chemotherapy to treat metastatic or locally advanced esophageal or gastroesophageal (GEJ) (tumors with epicenter 1 to 5 centimeters above the gastroesophageal junction) carcinoma in people who are not candidates for surgical resection or definitive chemoradiation. [30] Efficacy was evaluated in KEYNOTE-590 (NCT03189719), a multicenter, randomized, placebo-controlled trial that enrolled 749 participants with metastatic or locally advanced esophageal or gastroesophageal junction carcinoma who were not candidates for surgical resection or definitive chemoradiation. [30]

In May 2021, the US FDA approved pembrolizumab in combination with trastuzumab, fluoropyrimidine- and platinum-containing chemotherapy for the first-line treatment of people with locally advanced unresectable or metastatic HER2 positive gastric or gastroesophageal junction (GEJ) adenocarcinoma. [31] Approval was based on the prespecified interim analysis of the first 264 participants of the ongoing KEYNOTE-811 (NCT03615326) trial, a multicenter, randomized, double‑blind, placebo‑controlled trial in people with HER2‑positive advanced gastric or gastroesophageal junction (GEJ) adenocarcinoma who had not previously received systemic therapy for metastatic disease. [31]

In July 2021, the US FDA approved pembrolizumab for high-risk, early-stage, triple-negative breast cancer (TNBC) in combination with chemotherapy as neoadjuvant treatment, and then continued as a single agent as adjuvant treatment after surgery. [32] The FDA also granted regular approval to pembrolizumab in combination with chemotherapy for people with locally recurrent unresectable or metastatic TNBC whose tumors express PD-L1 (Combined Positive Score [CPS] ≥ 10) as determined by an FDA-approved test. [32]

In November 2021, the US FDA approved pembrolizumab for the adjuvant treatment of people twelve years of age and older with stage IIB or IIC melanoma following complete resection. [33]

In November 2021, the US FDA approved pembrolizumab for the adjuvant treatment of renal cell carcinoma for people at intermediate-high or high risk of recurrence following nephrectomy. [34] Approval was based on KEYNOTE-564, a multicenter, randomized (1:1), double-blind, placebo-controlled trial in 994 patients with intermediate-high or high risk of recurrence of RCC, or M1 no evidence of disease. [35]

In March 2022, the US FDA approved pembrolizumab for the treatment of advanced endometrial cancer. [36]

In January 2023, the US FDA approved pembrolizumab for adjuvant treatment following resection and platinum-based chemotherapy for stage IB (T2a ≥ 4 cm), II, or IIIA non-small cell lung cancer. [37]

In October 2023, the US FDA approved pembrolizumab to be used with gemcitabine and cisplatin for locally advanced unresectable or metastatic biliary tract cancer. [38]

In January 2024, the US FDA approved pembrolizumab, in combination with chemoradiotherapy for the treatment of people with FIGO (International Federation of Gynecology and Obstetrics) 2014 Stage III-IVA cervical cancer. [39]

In June 2024, the US FDA approved pembrolizumab with carboplatin and paclitaxel, followed by single-agent pembrolizumab, for adults with primary advanced or recurrent endometrial carcinoma. [40]

Adverse effects

People have had severe infusion-related reactions to pembrolizumab. There have also been severe immune-related adverse effects including lung inflammation (including fatal cases) and inflammation of endocrine organs that caused inflammation of the pituitary gland, of the thyroid (causing both hypothyroidism and hyperthyroidism in different people), and pancreatitis that caused Type 1 diabetes and diabetic ketoacidosis; some people have had to go on lifelong hormone therapy as a result (e.g. insulin therapy or thyroid hormones). People have also had colon inflammation, liver inflammation, kidney inflammation due to the drug. [19] [41]

The common adverse reactions have been fatigue (24%), rash (19%), itchiness (pruritus) (17%), diarrhea (12%), nausea (11%) and joint pain (arthralgia) (10%). [19]

Other adverse effects occurring in between 1% and 10% of people taking pembrolizumab have included anemia, decreased appetite, headache, dizziness, distortion of the sense of taste, dry eye, high blood pressure, abdominal pain, constipation, dry mouth, severe skin reactions, vitiligo, various kinds of acne, dry skin, eczema, muscle pain, pain in a limb, arthritis, weakness, edema, fever, chills, myasthenia gravis, and flu-like symptoms. [19]

Mechanism of action

Pembrolizumab is a therapeutic antibody that binds to and blocks PD-1 located on lymphocytes. This receptor is generally responsible for preventing the immune system from attacking the body's own tissues; it is a so-called immune checkpoint. [42] [43] Normally, the PD-1 receptor on activated T-cells binds to the PD-L1 or PD-L2 ligands present on normal cells in the body, deactivating any potential cell-mediated immune response against these cells. [44] [45] Many cancers make proteins such as PD-L1 that also bind to the PD-1 receptor, thus shutting down the ability of the body to kill the cancer. [23] [42] Pembrolizumab works by inhibiting lymphocytes' PD-1 receptors, blocking the ligands that would deactivate it and prevent an immune response.[ medical citation needed ] This allows the immune system to target and destroy cancer cells, [46] but also blocks a key mechanism preventing the immune system from attacking the body itself. This checkpoint inhibitor function of pembrolizumab thus has immune-dysfunction side effects as a result. [43]

Tumors often have mutations that cause impaired DNA mismatch repair. This in turn often results in microsatellite instability allowing the tumor to generate numerous mutant proteins that could serve as tumor antigens, triggering an immune response against the tumor. By preventing the self-checkpoint system from blocking the T-cells, [23] [47] pembrolizumab appears to facilitate clearance of any such tumor by the immune system.

Pharmacology

Since pembrolizumab is cleared from the circulation through non-specific catabolism, no metabolic drug interactions are expected and no studies were done on routes of elimination. [19] The systemic clearance [rate] is about 0.2 L/day and the terminal half-life is about 25 days. [19]

Chemistry and manufacturing

Pembrolizumab is an immunoglobulin G4, with a variable region against the human PD-1 receptor, a humanized mouse monoclonal [228-L-proline(H10-S>P)]γ4 heavy chain (134-218') disulfide and a humanized mouse monoclonal κ light chain dimer (226-226:229-229)-bisdisulfide. [48]

It is recombinantly manufactured in Chinese hamster ovary (CHO) cells. [49] [13]

History

Pembrolizumab was invented by scientists at Organon after which they worked with Medical Research Council Technology (which became LifeArc) starting in 2006, to humanize the antibody; Schering-Plough acquired Organon in 2007, and Merck & Co. acquired Schering-Plough two years later. [50] Inventors Gregory Carven, Hans van Eenennaam and Gradus Dulos were recognized as Inventors of the Year by the Intellectual Property Owners Education Foundation in 2016. [51]

The development program for pembrolizumab was seen as high priority at Organon, but low at Schering and later Merck. In early 2010, Merck terminated development and began preparing to out-license it. [52] Later, in 2010, scientists from Bristol Myers Squibb published a paper in The New England Journal of Medicine showing that their checkpoint inhibitor, ipilimumab (Yervoy), had shown strong promise in treating metastatic melanoma [53] and that a second Bristol Myers Squibb checkpoint inhibitor, nivolumab (Opdivo), was also promising. [52] Merck at that time had little commitment or expertise in either oncology or immunotherapy, but understood the opportunity and reacted strongly, reactivating the program and filing its IND by the end of 2010. [52] As one example, Martin Huber was one of the few senior people at Merck with strong experience in lung cancer drug development, but had been promoted to senior management and was no longer involved in product development. He stepped down from his role to lead clinical development of pembrolizumab for lung cancer. [52]

Scientists at the company argued for developing a companion diagnostic and limiting testing of the drug only to patients with biomarkers showing they were likely to respond, and received agreement from management. Some people, including shareholders and analysts, criticized this decision as it limited the potential market size for the drug, while others argued it increased the chances of proving the drug would work and would make clinical trials faster. (The trials would need fewer patients because of the likelihood of greater effect size.) Moving quickly and reducing the risk of failure was essential for catching up with Bristol-Myers Squibb, which had an approximate five year lead over Merck. [52] The phase I study started in early 2011, and Eric Rubin, who was running the melanoma trial, argued for and was able to win expansion of the trial until it reached around 1300 people. This was the largest phase I study ever run in oncology, with the patients roughly divided between melanoma and lung cancer. [52]

In 2013, Merck quietly applied for and won a breakthrough therapy designation for the drug. This regulatory pathway was new at the time and not well understood. One of its advantages is that the US FDA holds more frequent meetings with drug developers, reducing the risk of developers of making mistakes or misunderstandings arising from the differences between regulators' expectations and what the developers want to do. This was Merck's first use of the designation and the reduction in regulatory risk was one of the reasons management was willing to put company resources into development. [52]

In 2013, the United States Adopted Name (USAN) name was changed from lambrolizumab to pembrolizumab. [48] In that year clinical trial results in advanced melanoma were published in The New England Journal of Medicine . [54] This was part of the large phase I NCT01295827 trial. [55]

In September 2014, the US Food and Drug Administration approved pembrolizumab under the Fast Track Development Program. [56] It is approved for use following treatment with ipilimumab, or after treatment with ipilimumab and a BRAF inhibitor in advanced melanoma patients who carry a BRAF mutation. [57] Barone A, Hazarika M, Theoret MR, Mishra-Kalyani P, Chen H, He K, et al. (October 2017). "FDA Approval Summary: Pembrolizumab for the Treatment of Patients with Unresectable or Metastatic Melanoma". Clinical Cancer Research. 23 (19): 5661–5665. doi:10.1158/1078-0432.CCR-16-0664. PMID   28179454.

As of 2015, the only PD-1/PD-L1 targeting drugs on the market are pembrolizumab and nivolumab. [58]

By April 2016, Merck applied for approval to market the drug in Japan and signed an agreement with Taiho Pharmaceutical to co-promote it there. [59]

In July 2015, pembrolizumab received marketing approval in the European Union. [19] [60] [13]

In October 2015, the US FDA approved pembrolizumab for the treatment of metastatic non-small cell lung cancer (NSCLC) in people whose tumors express PD-L1 and who have failed treatment with other chemotherapeutic agents. [61] [62] [63]

In July 2016, the US FDA accepted for priority review an application for recurrent or metastatic head and neck squamous cell carcinoma (HNSCC) after a platinum-based chemotherapy. [64] They granted accelerated approval to pembrolizumab as a treatment for patients with recurrent or metastatic head and neck squamous cell carcinoma ("regardless of PD-L1 staining") following progression on a platinum-based chemotherapy, based on objective response rates (ORR) in the phase Ib KEYNOTE-012 study in August of the same year. [65] [66]

In October 2016, the US FDA approved pembrolizumab for the treatment of people with metastatic non-small cell lung cancer whose tumors express PD-L1 as determined by an FDA-approved test. [67]

In May 2017, pembrolizumab received an accelerated approval from the US FDA for use in any unresectable or metastatic solid tumor with DNA mismatch repair deficiencies or a microsatellite instability-high state (or, in the case of colon cancer, tumors that have progressed following chemotherapy). [68] This approval marked the first instance in which the FDA approved marketing of a drug based only on the presence of a genetic mutation, with no limitation on the site of the cancer or the kind of tissue in which it originated. [68] [28] [47] [69] The approval was based on a clinical trial of 149 patients with microsatellite instability-high or mismatch repair deficient cancers who enrolled on one of five single-arm trials. Ninety patients had colorectal cancer, and 59 patients had one of 14 other cancer types. The objective response rate for all patients was 39.6%. Response rates were similar across all cancer types, including 36% in colorectal cancer and 46% across the other tumor types. Notably, there were 11 complete responses, with the remainder partial responses. Responses lasted for at least six months in 78% of responders. [47] Because the clinical trial was fairly small, Merck is obligated to conduct further post-marketing studies to ensure that the results are valid. [70] Pembrolizumab was granted orphan drug designation for small-cell lung cancer in October 2017. [71]

In June 2018, the US FDA approved pembrolizumab for use in both advanced cervical cancer for PD-L1 positive patients [72] and for the treatment of adult and pediatric patients with refractory primary mediastinal large B-cell lymphoma (PMBCL), or who have relapsed after two or more prior lines of therapy. [73]

In August 2018, the US FDA updated the prescribing information for pembrolizumab to require the use of an FDA-approved companion diagnostic test to determine PD-L1 levels in tumor tissue from patients with locally advanced or metastatic urothelial cancer who are cisplatin-ineligible. [74] On 16 August 2018, the FDA approved the Dako PD-L1 IHC 22C3 PharmDx Assay (Dako North America, Inc.) as a companion diagnostic to select patients with locally advanced or metastatic urothelial carcinoma who are cisplatin-ineligible for treatment with pembrolizumab. [74] The 22C3 assay determines PD-L1 expression by using a combined positive score (CPS) assessing PD-L1 staining in tumor and immune cells. [74] As of August 2018, pembrolizumab is indicated for the treatment of those with locally advanced or metastatic urothelial carcinoma who are not eligible for cisplatin-containing chemotherapy and whose tumors express PD-L1 [Combined Positive Score (CPS) ≥ 10] as determined by an FDA-approved test, or in patients who are not eligible for any platinum-containing chemotherapy regardless of PD-L1 status. [74]

In November 2018, the US FDA granted accelerated approval to pembrolizumab for those with hepatocellular carcinoma (HCC) who have been previously treated with sorafenib. [75]

In February 2019, the US FDA approved pembrolizumab for the adjuvant treatment of patients with melanoma with involvement of lymph node(s) following complete resection. [76] The FDA granted the application orphan drug designation. [76]

In June 2019, the US FDA granted accelerated approval to pembrolizumab for those with metastatic small cell lung cancer (SCLC) with disease progression on or after platinum-based chemotherapy and at least one other prior line of therapy, [71] and the FDA approved pembrolizumab for the first-line treatment of patients with metastatic or unresectable recurrent head and neck squamous cell carcinoma (HNSCC). [77] Pembrolizumab was approved for use in combination with platinum and fluorouracil (FU) for all patients and as a single agent for patients whose tumors express PD‑L1 (Combined Positive Score [CPS] ≥ 1) as determined by an FDA‑approved test. [77] The FDA also expanded the intended use for the PD-L1 IHC 22C3 pharmDx kit to include use as a companion diagnostic device for selecting patients with head and neck squamous cell carcinoma for treatment with pembrolizumab as a single agent. [77]

In July 2019, the US FDA approved pembrolizumab for patients with recurrent, locally advanced or metastatic, squamous cell carcinoma of the esophagus (ESCC) whose tumors express PD-L1 (Combined Positive Score [CPS] ≥ 10), as determined by an FDA-approved test, with disease progression after one or more prior lines of systemic therapy. [24] The FDA also approved a new use for the PD-L1 IHC 22C3 pharmDx kit as a companion diagnostic device for selecting patients for the above indication. [24]

In June 2020, the US FDA approved pembrolizumab as monotherapy for the treatment of adults and children with unresectable or metastatic tumor mutational burden-high (TMB-H) [≥ 10 mutations/megabase (mut/Mb)] solid tumors, as determined by an FDA-approved test, that have progressed following prior treatment and who have no satisfactory alternative treatment options. [78]

In March 2021, the accelerated approval indication in the US for the treatment of people with metastatic small-cell lung cancer (SCLC) was removed. [12]

In January 2024, the FDA approved pembrolizumab, in combination with chemoradiotherapy, for people with FIGO 2014 Stage III-IVA cervical cancer. [39] Efficacy was evaluated in KEYNOTE-A18 (NCT04221945), a multicenter, randomized, double-blind, placebo-controlled trial enrolling 1060 participants with cervical cancer who had not previously received definitive surgery, radiation, or systemic therapy. [39] The trial included 596 participants with FIGO 2014 Stage III-IVA disease and 462 participants with FIGO 2014 Stage IB2-IIB, node-positive disease. [39]

In June 2024, the US FDA approved pembrolizumab with carboplatin and paclitaxel, followed by single-agent pembrolizumab, for adults with primary advanced or recurrent endometrial carcinoma. [40] Efficacy was evaluated in KEYNOTE-868/NRG-GY018 (NCT03914612), a multicenter, randomized, double-blind, placebo-controlled trial enrolling 810 participants with advanced or recurrent endometrial carcinoma. [40] [79] The trial included two separate cohorts based on mismatch repair status: 222 participants in the mismatch repair deficient cohort, and 588 participants in the mismatch repair proficient cohort. [40]

Society and culture

Economics

Pembrolizumab was priced at US$150,000 per year when it launched in 2014. [80]

It was added to the Cancer Drugs Fund list of NHS England in November 2022, after a "confidential" deal with manufacturer Merck Sharp and Dohme. [81] [82] [83]

Research

In 2015, Merck reported results in thirteen cancer types; much attention was given to early results in head and neck cancer. [23] [84] [85]

As of May 2016, pembrolizumab was in phase IB clinical trials for triple-negative breast cancer (TNBC), gastric cancer, urothelial cancer, and head and neck cancer (all under the "Keynote-012" trial) and in phase II trial for TNBC (the "Keynote-086" trial). [86] At ASCO, in June 2016, Merck reported that the clinical development program was directed to around 30 cancers and that it was running over 270 clinical trials (around 100 in combination with other treatments) and had four registration-enabling studies in process. [87]

Results of a phase III clinical trial in triple-negative breast cancer were reported in October 2019. [88]

Results of a phase II clinical trial in Merkel-cell carcinoma were reported in June 2016. [89]

Results of a clinical trial in people with untreatable metastases arising from various solid tumors were reported in 2017. [90]

A clinical phase III trial in combination with epacadostat, an Indoleamine 2,3-dioxygenase (IDO1) inhibitor to treat melanoma was completed in 2019. [23] [91]

In 2021, researchers reported the results of a five-year follow-up study. [92]

In January 2022, a combination clinical trial of pembrolizumab and NL-201, a de novo protein undergoing a phase I clinical trial in people with advanced, relapsed or refractory solid tumors. [93]

In March 2023, Merck reported the results of NRG-GY018, a phase III clinical trial in people with stage three to four or recurrent endometrial carcinoma. [94] [95]

In 2022, mRNA-4157/V940 drug candidate, a cancer vaccine, was studied alongside pembrolizumab for treatment of skin and pancreatic cancers. mRNA-4157/V940 went on to be granted breakthrough therapy designation by the FDA. [96] [97]

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References

  1. ↑ "Pembrolizumab (Keytruda) Use During Pregnancy". Drugs.com. 24 September 2019. Archived from the original on 14 June 2020. Retrieved 10 January 2020.
  2. ↑ "Keytruda, Microsatellite instability-high cancer". Department of Health and Aged Care, Commonwealth of Australia. Archived from the original on 22 November 2022.
  3. ↑ "Keytruda, Oesophageal Cancer". Department of Health and Aged Care, Commonwealth of Australia. Archived from the original on 22 November 2022.
  4. ↑ "Keytruda (pembrolizumab) is indicated for the adjuvant treatment of adult and adolescent (12 years and older) patients with Stage IIB, IIC, or III melanoma who have undergone complete resection". Department of Health and Aged Care, Commonwealth of Australia. Archived from the original on 18 March 2023. Retrieved 18 March 2023.
  5. ↑ "Prescription medicines: registration of new chemical entities in Australia, 2015". Therapeutic Goods Administration (TGA). 21 June 2022. Archived from the original on 10 April 2023. Retrieved 10 April 2023.
  6. ↑ "Prescription medicines and biologicals: TGA annual summary 2017". Therapeutic Goods Administration (TGA). 21 June 2022. Archived from the original on 31 March 2024. Retrieved 31 March 2024.
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