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422 N. Nomikou et al.
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Chapter 16
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Nanoparticles and Cancer Chemotherapy
Guojun Xiong and Ijeoma F. Uchegbu
Abbreviations
WHO World Health Organization mTNBC Metastatic triple-negative breast cancer NCCN National Comprehensive Cancer Network EMSO European Society for Medical Oncology HER2 Human epidermal growth factor receptor 2 PARPi Poly-ADP-ribosyl polymerase inhibitor US FDA United States Food and Drug Administration API Active pharmaceutical ingredient EPR effect Enhanced permeability and retention effect NIH National Institutes of Health PET/CT Positron emission tomography/computed tomography MPS Mononuclear phagocyte system PEG Polyethylene glycol DSPE-PCB Distearoyl phosphoethanolamine-polycarboxybetaine MIRV Mirvetuximab soravtansine PFS Progression-free survival ADC Antibody-drug conjugate TME Tumour microenvironment APC Antigen-presenting cells
G. Xiong UCL School of Pharmacy, London, UK
I. F. Uchegbu (*) UCL School of Pharmacy, University College London, London, UK e-mail:
ijeoma.uchegbu@ucl.ac.uk
© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2024 I. F. Uchegbu et al. (eds.), Fundamentals of Pharmaceutical Nanoscience,
https://doi.org/10.1007/978-3-031-59478-6_16
423
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16.1 Introduction
Cancer is a general term for the fatal diseases caused by the abnormal differentiation, division and uncontrolled growth of the cells, also known as malignant tumours and neoplasms, and cancer is also the major cause of death globally (Bray et al. According to the global statistical data (Sung et al. 2021) provided by the World Health Organization (WHO), approximately 10 million deaths were due to cancer in
2020. Cancers are generally divided into two major categories: malignant tumours and hematologic cancers. Patients with malignant tumours (excluding blood and related tumours, such as lymphomas and myelomas) account ed for approximately 90% of the global new cancer cases in 2020 (Sung et al.
2021). From a survey on the
registered causes of cancer deaths in Norway in 2015, an average of 66.7% of the cancer deaths with different solid tumours were associated with cancer metastasis (Dillekås et al.
2019). For the deaths caused by ovarian cancer in this survey, the
leading cause in over 90% of deaths was due to metastasis. Cancer metastasis refers to the spread of cancer cells (which have differentiated from the primary solid tumour) from primary sites to other organs and tissues through the circulatory system (Paduch 2016). Therefore, based on the above real-life cancer statistics, metastasis is the leading cause of death for the most cancer patients. Depending on the develop­ment of the tumour, cancer patients can be commonly classied into ve stages at the time of diagnosis (Rosen and Sapra 2023), as listed in Table 16.1. Patients with Stage 4 cancer are referred to as metastatic cancer patients.
According to the cancer statistics in England (Quaresma et al. 2015), the Nordic countries (Engholm et al. 2010) and the United States (Siegel et al. 2023), compared to cancer patients in the twentieth century, with the advancement of diagnostic techniques and treatment capabilities, the life expectancy of cancer patients in this century has signicantly improved. However, due to the potential for cancer recur­rence and metastasis, curing cancer remains challenging. Once malignancies pro­gress to late stages or become unresectable, patients are typically considered incurable and are provided with palliative treatment (Hui et al.
2018). As a result,
the ve-year survival rate of patients with stage 4 cancer is sharply decreased when compared with that of patients with stage 1, 2 and 3 cancer (Greene and Sobin In some particular advanced cancers such as metastatic triple-negative breast cancer (mTNBC), the ve-year survival rate for both treated and untreated mTNBC patients
2021).
2008).
Table 16.1 Denition of the stage 04 cancer
Stage Denition 0 Carcinoma in situ, the abnormal cells are localized at their original site and has not spread 1 Tumour is small and malignant but has not spread 2 The malignant tumour has grown in its localized area and has not spread 3 The malignant tumour has increased in size and it may spread to the surrounding tissues
and/or lymph nodes
4 The malignant tumour has spread to other sites of the body, which is commonly referred
to as metastatic or advanced cancer
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was less than 10% in one investigation on 608 mTNBC patients diagnosed between 2010 and 2016 (Skinner et al. 2021). The ve-year survival rates for patients diagnosed with stage 4 colorectal cancer in the United States in 2011 and 2017 were 11% and 15%, respectively (Miller et al.
2022). Approximately 20% of patients
with stage 4 colorectal cancer or breast cancer and around 30% of advanced non-small cell lung cancer patients decided to forgo treatment (Miller et al. These gruesome death
statistics suggest that there are unmet medical needs for
2022).
effective treatment of some metastatic cancers such as mTNBC and advanced gastrointestinal cancers (Miller et al.
2022).
In accordance with the clinical practice guidelines (Gennari et al. 2021; National Comprehensive Cancer Network 2023) from the National Comprehensive Cancer Network (NCCN) and the European Society for Medical Oncology (ESMO), sys­temic chemotherapy is recommended as the stand of care or the rst-line treatment for most patients with advanced cancer.
16.2 Cancer Chemotherapy
Chemotherapy is a systemic treatment for cancers and involves the use of alkylating drugs, antimet abolites, anthracyclines, taxanes and topoisomerase inhibitors for killing cancer cells systemically (Luo et al. for different clinical purposes depending on the patients cancer. For some cancers, such as acute leukaemia (Bhatt et al.
2019), systemic chemotherapy is recommended as the primary treatment.
Neoadjuvant chemotherapy (Glynne-Jones et al. 2006) is a treatment used to shrink the tumour before the surgical resection or radiation therapy. In most instances, the adjuvant chemotherapy (Rampurwala et al. 2014) is given to cancer patients who have received the primary treatment or patients with unresectable tumours in order to inhibit or eliminate the growth of the tumour.
In current treatment strategies, systemic chemotherapy is the mainstay of treat­ment for most patients with late-stage cancer (Bianchini et al.
2020; Miller et al. 2022). Based on the 2023 National Comprehensive Cancer
Network
®
(NCCN® ) clinical practice guidelines in oncology (NCCN Guidelines® , available at https://www.nccn.org/guidelines/category_1), systemic chemotherapy­based treatment regimens are recommended as the rst-line treatment for most advanced cancers, such as met astatic non-small cell lung cancer, advanced prostate cancer, stage 4 cervical cancer, stage 4 bladder cancer and metastatic breast cancer. As more clinical data has disclosed (Takashima et al.
), combination therapy offers more survival benets than monotherapy for
2021
cancer patients. Compared to single-agent chemotherapy, some combined chemo­therapies have shown synergistic anti-cancer activity in patients. According to the results of various clinical trials, the median overall survival of metastatic breast cancer patients who received single-agent chemotherapy with paclitaxel, docetaxel or a platinum-based drug was approximately 11 to 14 months (Burris
2017). Chemotherapy may be applied
2018) and small cell lung cancer (Sun et al.
2016; Nagayama et al.
2009; Han et al.
2017; Ayoub
1999; Perez
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et al. 2001; Isakoff et al. 2015). The clinical data of the phase 3 clinical trial (NCT02546934) on mTNBC patients (Wang et al. 2022), revealed that the median overall survival of these mTNBC patients treated with nab-paclitaxel plus cisplatin and gemcitabine plus cisplatin was 26.3 months and 22.9 months, respectively.
16.3 Other Therapies for Cancer
Surgery, chemotherapy and radiotherapy are the conventional therapies for the treatment of cancer patients (Tannock 1998). With the technological advances in immunohistochemistry and cancer genomics (Thennavan et al. 2021), more genes, proteins and receptors overexpressed in cancer cells have been identied and thus tumours may be further subdivided based on their molecular characteristics. Based on these discovered biomarkers, additional systemic therapies are available to specic cancer patients. The emerging therapies include, but are not limited to, Poly-ADP-ribosyl polymerase inhibitor (PARPi) therapy, hormone thera py, PI3K/ Akt/mTOR targeted therapy, human epidermal growth factor receptor 2 (HER2)­targeted therapy and immunotherapy.
For example, according to different subtypes of breast cancer cells, breast cancer may be further divided into luminal A-like breast cancer, luminal B-like breast cancer (HER2-), luminal B-like breast cancer (HER2+), HER2-enriched breast cancer and triple-negative breast cancer (Harbeck et al. exploiting these cancer-related biomarkers, patients with luminal A or B breast cancer may benet from the hormonal therapy, and patients with HER2-enriched breast cancer can receive HER2-targeted therapy (Vanneman and Dranoff addition to the conventional therapies. The progress in tumour genomic proling has greatly improved the understanding of inter-tumour heterogeneity and the specic cell type vulnerabilities have been probed to achieve more targeted treatments (Arnedos et al. therapies have failed to demonstrate superiority to conventional chemotherapy in clinical trials (Janku 2014; Lüönd et al. 2021).
2015; Malone et al. 2020). However, some of these emerging
2019). Therefore, by
2012)in
PARPi Therapy
The mutation of the tumour suppressor or DNA repair genesBRCA1/2 commonly occur in various cancer types, including melanoma, ovarian, breast, prostate, lung, pancreatic and gastrointestinal cancers (Schettini et al. DNA repair genePARP is expected to be overexpressed to encode poly-ADP­ribosyl polymerase-1/2 to repair the DNA damage caused by the chemotherapeutics (Chopra et al. 2020). Therefore, a number of PARP inhibitors, such as Olaparib, Talazoparib, Niraparib, Pazopanib and Rucaparib, have been develo ped for the clinical treatment of cancer patients with BRCA mutations. Among these, Niraparib and Rucaparib are recommended by the NCCN® to treat the advanced ovarian cancer patients who have received at least two lines of chemotherapy. Olaparib and Talazoparib are recommended by the NCCN and the ESMO for the rst-line
2021). Consequently, another
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treatment of mTNBC pati ents with germline BRCA mutations and without the PD-L1 expression (Gennari et al. 2021).
In theory, combining DNA-damaging agents with PARP inhibitors should enhance therapeutic efcacy and, consequently, extend the lifespan of patients with BRCA-mutated cancers. However, in the phase III clinical trial NCT00938652 (OShaughnessy et al. (PARP inhibitor) in combination with gemcitabine and carboplatin had a similar median overall survival of 11.1 months versus 11.8 months as mTNBC patients who received only chemotherapy (gemcitabine + carboplatin). Another phase 3, random­ized, double-blind, placebo-controlled clinical tri al, NCT02032277 (Loibl et al.
2018), investigated the impact of adding the PARP inhibitor, veliparib, to the
neoadjuvant chemotherapy in patients with early-stage TNBC and the clinical outcome of the neoadjuvant chemotherapy (paclitaxel, as a nanoformulation plus carboplatin) was not statistically signicantly different with/without the addition of the veliparib, with pathological complete response (pCR) values of 53% and 58%, respectively ( p ¼ 0.36). Lynparza (Olaparib), an FDA-approved PARP inhibitor, was used as monotherapy for patients with the HER2-negative metastatic breast cancer (germline BRCA mutation) who had previously received neoadjuvant or adjuvant chemotherapy in the phase 3 clinical trial, NCT02000622. Patients in the Olaparib-treated group had signicantly improved progression-free survival com­pared to those in the single-agent chemotherapy arm, 7.0 months versus 4.2 months (Robson et al. survival of the patients in the Olaparib-treated group and the single-agent chemo­therapy group was not signicantly different, 19.3 months versus 17.1 months, p ¼ 0.531 (Robson et al. 2023). In addition, the talazoparib monotherapy in the phase 3 EMBRACA trial, NCT01945775, also failed to improve the median overall survival of patients when compared with the chemotherapy arm, 19.3 months versus
19.5 months (Litton et al.
2017). However, in the follow-up investigation, the median overall
2020).
2014), mTNBC patients who received iniparib
Immunotherapy: Immune Checkpoint Inhibitor
The programmed cell death ligands 1 and 2 (PD-L1, PD-L2) are found in many cancers (Sciascia et al. bind with the programmed death receptor 1 (PD-1) of cytotoxic T cells, which allows the cancer cells to escape attack from the tumour-inltrating lymphocytes (Dong et al. 2017). By blocking the interaction between the PD-1 and the PD-L1, the cancer cells are expected to be decimated by the immune system. Pembrolizumab (Keytruda) is an immune checkpoint inhibitor (PD-1 inhibitor) and is used as immunotherapy for advanced non-small cell lung cancer (Pai-Scherf et al. advanced melanoma (Robert et al.
2017; Suzman et al. 2019) and Hodgkins lymphoma (Kuruvilla et al. 2021). PD-L1
expression was found in approximately 20% of TNBC patients (Mittendorf et al.
2014). However, when pembrolizumab was used as monotherapy for patients with
mTNBC in a phase 3 clinical trial, NCT02555657, pembrolizumab monotherapy failed to improve the overall survival of mTNBC patients in comparison to the use of capecitabine, eribulin, gemcitabine, or vinorelbine single-agent chemotherapy
2021). The overexpressed programmed cell death ligands
2017),
2015), advanced bladder cancer (Bellmunt et al.
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(Winer et al. 2021) and the median overall survival of the mTNBC patients in the pembrolizumab group and the chemotherapy group was 9.9 months and 10.8 months, respectively. While in the phase III clinical trial, NCT02819518 (Cortes et al. 2022), a pembrolizumab plus chemotherapy treatment regimen signicantly improved the median overall survival of mTNBC patients with high expression of PD-L1 (CPS > 10) when compared with the standard chemotherapy group, 23 months versus 16.1 months.
PI3K/Akt/mTOR Targeted Therapy
The PI3K/Akt signalling pathw ay is a signal transduction pathway within cells that promotes metabolism, proliferation and cell growth and regulates the cell cycle in response to extracellular signals (Yang et al. Akt pathway contributes to tumour growth, angiogenesis and cancer metastasis and induces drug resistance (He et al.
2019) in this signalling pathway include phosphatidylinositol 3-kinase (PI3K), a
serine/threonine protein kinase (Akt) and mammalian target of rapamycin (mTOR). In many preclinical studies (Lin et al. 2013; Yan et al. 2014; Cash et al. 2015; Carnevalli et al. 2018), tumour growth in tumour-bearing mice was signicantly suppressed when the mice were treated with PI3K/Akt/mTOR pathway inhibitors. However, in a phase 3 clinical trial, NCT02437318, on advanced breast cancer patients with HR+, HER2- and PIK3CA genetic mutations, the median overall survival of patients treated with alpelisib (a PI3K inhibitor) and fulvestrant was not statistically signicantly different from that of patients treated with fulvestrant and placebo: 39.3 months versus 31.4 months respectively (André et al. 2021). Similarly, in another phase 3 clinical trial, NCT03337724, involving patients with PIK3CA/AKT1/PTEN-altered HR + HER2- advanced breast cancer, the regimen of ipatasertib (Akt inhibitor) plus paclitaxel did not provide a greater survival benet compared to patients treated with paclitaxel plus placebo, the median progression­free survival for both arms, as assessed by the investigators was 9.3 months (Turner et al. 2022). All paclitaxel treatments would have been nanoparticle-based formulations.
2021). The important nodes (Chamcheu et al.
2019). The aberrantly activated PI3K/
These emerging cancer therapies do provide more treatment options for cancer patients and many patients have already beneted from advances in cancer treat­ment. In a study on 40-year trends in survival rates for all cancer patients in England, the ve-year survival rate for all cancers was found to have increased from 29.8% in 1971 to 54.3% in 2011 (Quaresma et al. survival benets from these therapies for patients are very limited. Chemotherapy remains a crucial part of cancer treatment and the combination of both targeted therapies and chemotherapy may offer the best approach for certain cancer patients (Conroy et al. 2016
2020; Miller et al. 2022).
2015). However, for advanced cancers, the
; Bianchini et al. 2016; Nagayama et al. 2020; Taieb and Gallois
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16.4 Nanotechnology and Chemotherapeutic Agents
Chemotherapy is a treatment approach that utilizes cytotoxic agents, commonly referred to as chemotherapeutic agents. These agents are employed to disrupt the cell growth cycle and ultimately destroy cancer cells. Although chemotherapy is the most effective and widely used treatment for advanced cancer patients, its serious side effects, variable efcacy and high treatment costs have led many cancer patients to consider discontinuing their treatment (Miller et al.
Indeed, many chemotherapeutic drugs exhibit outstanding cytotoxicity against cancer cells in vitro. For example, Volk-Draper et al. reported IC paclitaxel in cancer cell lines of MDA-MB-231 and HCC1806 were around 12 nM (10.25 μg/mL) and 0.78 nM (0.67 μg/mL), respectively (Volk-Draper et al. 2012). However, the real therapeutic effect of these anti-cancer drugs in cancer patients is not as great as this in vitro data would suggest. Limitations that affect the perfor­mance of anti-cancer drugs in the body include the poor solubility of most active ingredients (Blume and Schug 1999), various biological barriers (Blanco et al.
2015), non-specic distribution of drugs in organs and tissues, rapid clearance of
drugs from the plasma (Yu et al. 2022) and the complexity of the tumour microen­vironment (Swartz et al. 2012). Unfortunately, many drugs with anti-cancer activity have a low solubility in water, resulting in suboptimal formulations of hydrophobic drugs or the addition of biologically toxic excipients to solubilize the anti-cancer drugs. For example, sorafenib (Jiang et al.
2017), an inhibitor of tyrosine protein
kinases, is used for the treatment of hepatocellular carcinoma, advanced renal cell carcinoma and thyroid cancer. However, sorafenib itself is insoluble in water. The commercially available sorafenib (Nexavar®) is the tosylate salt of sorafenib. Although salt formation is a common method to increase the solubility of drugs, sorafenib tosylate (Nexavar
®
) hardly dissolves in the gastrointestinal tract after oral administration, resulting in a low and erratic bioavailability of sorafenib in patients and unnecessary toxicity to patients. Another example is the formulation – Taxol Taxol® is a conventional chemotherapeutic agent for the systematic treatment of numerous cancers, including metastatic breast cancer, by parenteral administration (Gradishar paclitaxel, biologically toxic excipients, polyethoxylated castor oil and ethanol are added to the Taxol
2006). Paclitaxel is a hydrophobic anti-cancer drug. In order to solubilize
®
formulation. The lack of an optimal formulation is one of the major reasons that the promising in vitro performance of these hydrophobic drugs is difcult to be achieved in vivo.
2022).
values of
50
®
.
Nanoformulations Developed for Oncotherapy
To address the deciencies of conventional chemotherapeutic drugs in cancer treatment, the emergence of nanoscale drug delivery systems has ushered in a new era of systemic chemotherapy. Nanoscale drug delivery systems are a crucial component of nanomedicines, a term proposed in the 1990s to describe nanoscale systems or materials designed for various medical purposes (Fornaguera and García­Celma 2017). To date, several nanomedicines have reached the market for the treatment of cancer (Anselmo and Mitragotri
2019), such as Doxil
®
, Abraxane® ,
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Onivyde® and Genexol-PM® , etc. Most nanomedicines have shown improved pharmacokinetics proles, reduced systemic toxicity and enhanced therapeutic ef­cacy, compared to traditional chemotherapeutic drugs with the same active pharma­ceutical ingredient (API). For example, doxorubicin hydrochloride is a conventional formulation of the chemotherapeutic agent (doxorubicin), which is used to treat various cancers, including breast cancer, blood cancers, bo cancer and more.
Doxorubicin hydrochlorid e has the serious side effect of
cardiotoxicity. However, when it is encapsulated in liposomes (Doxil
ne sarcoma, ovarian
®
), its cardiotoxicity is signicantly reduced, and its efcacy is signicantly improved (Xing et al.
2015).
The signicant advantage of formulating hydrophobic drugs through nanotech­nology is that lipophilic drugs can reach high aqueous levels through nanocarriers without the need for additional toxic excipients in the formulation. For example, the water solubility of paclitaxel is lower than 50 μg/mL, but when formulated as albumin-bound paclitaxel nanoparticles (Abraxane may be increased to at least 2000 μg/mL by these albumin nanocarriers. Further­more, Abraxane
®
Taxol
contains the organic solvent ethanol and the toxic surfactant, Cremophor EL. As a result, Abraxane of paclitaxel, with signicantly lower systemic toxicity and greater efcacy for patients when compared to Taxol trial (Gradishar et al.
®
is composed of human serum albumin and paclitaxel, while
®
is capable of delivering a higher maximum tolerated dose
®
and this was demonstrated in phase 3 clinical
2005).
®
), aqueous levels of paclitaxel
Approximately 75% of drug candidates (Gala et al. 2020) have poor water solubility and only 0.02% to 0.04% of prospective anti-cancer drugs are ultimately approved by the United States Food and Drug Administration (US FDA). Suboptimal formulation of lipophilic drugs is a signicant factor limiting the tran­sition of prospective drugs from the laboratory to clinical applications (Gala et al.
2020). Applying nanotechnology in pharmaceutics allows for the positive improve-
ment of the properties of many conventional drugs (Allen
2004). Various
nanoplatforms, including polymeric nanoparticles, polymer micelles, liposomal nanoparticles, dendrimers, solid lipid nanoparticles, polymer/antibody-drug conju­gates, inorganic nanoparticles and carbon-based nanomaterials, have been devel­oped and applied for diverse medical purposes. These include acting as non-toxic nanocarriers for peptides, genes, or hydrophobic drugs, and being used as magnetic resonance imaging contrast agents for tumour imaging and cancer diagnosis. Some representative FDA-approved nanomedicines are listed in Table
16.2.
16.5 Challenges and Perspectives of Nanomedicines
Indeed, nanomedicines have brought signicant advancements to cancer treatment, but their use also comes with formidable challenges. Nanotechnology has addressed the issue of suboptimal drug formulations, yet the effective utilization of drugs in the
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Prescription
Marketing
status (2023)
Approval
year Indication(s)
ple myeloma
1996 Magnetic resonance imaging Discontinued
Prescription
Discontinued
metastatic adenocarcinoma of the pancreas
leukaemia
Prescription
amyloidosis
2017 Acute myeloid leukaemia Prescription
https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm
2018 Polyneuropathy of hereditary transthyretin-mediated
Liposome Doxorubicin hydrochloride 1995 Ovarian cancer, AIDS-related Kaposis sarcoma and multi-
®
Product Nanoplatform API
Table 16.2 Representative examples of FDA-approved nanomedicines
Doxil
3
O
2
SPIONs Fe
Liposome Daunorubicin Citrate 1996 Kaposis sarcoma Discontinued
®
®
Feridex
DaunoXome
Paclitaxel 2005 Metastatic breast cancer, non-small cell lung cancer and
Liposome Cytarabine 1999 Lymphomatous meningitis Discontinued
Albumin-based
nanoparticle
®
®
DepoCyt
®
Abraxane
Liposome Vincristine sulphate 2012 Philadelphia chromosome-negative acute lymphoblastic
Liposome Irinotecan hydrochloride 2015 Metastatic adenocarcinoma of the pancreas Prescription
Liposome Daunorubicin and
®
®
Marqibo
ONIVYDE
VYXEOS
cytarabine
Transthyretin-directed
small interfering RNA
Lipid
nanoparticle
®
Onpattro
Data source: US FDA Drug Approvals and Databases, available at:
API active pharmaceutical ingredient, AIDS acquired immune deciency syndrome, FDA food and drug administration, SPION superparamagnetic iron oxide
nanoparticle