Nisin ZP Combined with Limited Chemotherapy in Oropharyngeal Squamous Cell Carcinoma: A Case Report

Article Information

Qianlin Ye1, Aimin He3, Yeping Wu3, Yvonne L Kapila1,2*

1Section of Biosystems and Function, School of Dentistry, University of California Los Angeles, Los Angeles, CA, USA

2Section of Periodontics, School of Dentistry, University of California Los Angeles, Los Angeles, CA, USA

3Handary, Rue Colonel Bourg 127, 1140 Brussels, Belgium

*Corresponding Author:  Yvonne L Kapila, Section of Biosystems and Function, School of Dentistry, University of California Los Angeles, Los Angeles, CA, USA

Received: 22 March 2024; Accepted: 08 April 2024; Published: 12 June 2024

Citation: Qianlin Ye, Aimin He, Yeping Wu, Yvonne L Kapila. Nisin ZP Combined with Limited Chemotherapy in Oropharyngeal Squamous Cell Carcinoma: A Case Report. Archives of Clinical and Medical Case Reports. 8 (2024): 112-115

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Abstract

Objective: This case report describes and discusses the therapeutic potential of nisin ZP as adjunctive therapy in patients with oral squamous cell carcinoma (OSCC).

Case Report: A 43-year-old Asian male with OSCC initiated treatment with Paclitaxel and Cisplatin chemotherapy. Nisin ZP was administrated during and after the chemotherapy.

Results: The patient experienced symptom relief and significant tumor regression following administration of nisin ZP.

Conclusion: Nisin ZP shows promising potential as an adjunctive therapy for OSCC, offering symptom relief and contributing to tumor size reduction.

Keywords

Nisin ZP; Oral squamous cell carcinoma; Adjunctive therapy

Nisin ZP articles; Oral squamous cell carcinoma articles; Adjunctive therapy articles.

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Article Details

1. Introduction

Oral squamous cell carcinoma (OSCC) is a common oral cancer that originates from squamous cells. The complexities of OSCC present formidable treatment challenges, given its impact on essential functions like swallowing, speech, and respiration [1]. Considering the variability in outcomes and notable side effects associated with standard cancer treatments, including chemotherapy and targeted therapies, the pursuit of novel, effective treatments becomes imperative [2].

Innovative therapeutic strategies include the use of antimicrobial agents. Among these, nisin, a natural antimicrobial peptide produced by the gram positive Lactococcus lactis probiotic, has emerged as a promising candidate for cancer treatment [3]. Due to its broad spectrum activity against both Gram-positive and Gram-negative bacteria [4], [5], nisin is renowned for its role as a natural food preservative in the food industry [6], [7]. Its FDA-approved status and established safety for human consumption have spurred substantial interest in exploring its therapeutic potential beyond food preservation. Recent attention has focused on the potential of nisin, particularly its ultrapurified form, nisin ZP, as a viable option for cancer treatment [8], [9]. Studies have unveiled the selective effects of nisin against cancer cells while preserving healthy cells, positioning nisin as a promising agent for cancer therapy.

In this context, we present a unique case report where incorporating nisin ZP alongside chemotherapy reduced tumor size in a patient with OSCC. By evaluating the therapeutic role of nisin, our aim is to fortify the growing body of evidence supporting nisin as an adjunctive treatment for cancer.

2. Case Report

The case involves a 43-year-old Asian male presenting with a diagnosis of OSCC involving the left buccal mucosa posterior to the maxillary premolar region and left oropharynx, with extension to the base of the tongue (cT1N1M0, Stage III). The patient’s condition was characterized using computed tomography (CT) imaging, which disclosed a soft tissue mass situated within the left lateral oropharynx, with involvement of the base of the tongue (Figure 1). The measured size of this mass was approximately 11 x 9 mm, adjacent to the left mandibular angle. Bilateral maxillary sinuses exhibited mucosal thickening and calcifications indicative of maxillary sinusitis (Figure 2), accompanied by increased density changes in the maxillofacial and skull base bones, suggesting sclerosis. Notably, an enlarged lymph node was detected at the left mandibular angle, while several bilateral cervical lymph nodes showed slight enlargement. No evidence of distant metastases in other organs was observed, although certain limitations in evaluation were encountered due to pseudoshadows in CT.

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Figure 1: Soft tissue mass in the left lateral oropharynx (pointed by the arrow).

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Figure 2: Sinus mucosal thickening and intrasinus calcification (pointed by the arrow).

A biopsy procedure yielded a dark gray-yellow specimen, measuring 0.5 x 0.5 x 0.3 cm, collected from the left oropharynx. The subsequent histopathological examination confirmed the presence of squamous cell carcinoma. These findings underscored the intricate nature of oral cancer, emphasizing the necessity for a comprehensive treatment approach.

The patient's treatment started on June 17, 2023, with the initiation of the first round of chemotherapy, comprised of a 270 mg Paclitaxel injection and 140 mg Cisplatin injection.  During the chemotherapy session, 1g nisin ZP was administered twice daily. Subsequently, from July 1 to July 23, the patient continued with nisin ZP (Handary) treatment, receiving 0.8g nisin ZP with 160g lemon juice twice daily.

Remarkably, after 23 days of nisin administration coupled with a single round of chemotherapy, the patient experienced relief from symptoms and a significant reduction in OSCC lesion size (Figure 3). Notably, due to certain circumstances, the patient received 300 mg of Trastuzumab on July 12, a targeted therapy for HER2-positive cancer [10]; however, the expected responses were not achieved. Subsequent genetic analysis revealed a mutation in Notch1 (c.166C>T) but no mutation in Her2, potentially explaining the suboptimal Trastuzumab response. Consequently, the patient chose to continue chemotherapy while also receiving ongoing administration of nisin ZP. As of March 2024, the patient has shown alleviated symptoms with significant reduction in tumor size.

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Figure 3: (A) OSCC lesion at the left buccal mucosa before the first chemotherapy on June 17th. (B) Reduced lesion size after 23-day nisin administration. (pointed by arrows)

3. Discussion

This report discusses a case where a patient diagnosed with OSCC experienced reduced symptoms following nisin ZP administration combined with a single round of chemotherapy. This case report supports the same findings from another prior case report in a patient with tongue OSCC [11]. While the simultaneous use of nisin ZP and chemotherapy presents challenges in isolating their individual effects, the potential role of nisin ZP in enhancing the treatment and possibly reducing the required chemotherapy warrants attention. Typically, chemotherapy extends over a span of 3 to 6 months. However, the patient's substantial alleviation of symptoms following just one chemotherapy session, coupled with a 23-day course of nisin ZP administration, underscores the potential pivotal role of nisin ZP in cancer treatment.

Investigations have demonstrated the selective toxicity of nisin and nisin ZP against diverse cancer cell types, including non-small cell lung cancer [12] (NSCLC), hepatocellular carcinoma [13], cervical cancer [8], and head and neck squamous cell carcinoma (HNSCC) [3], [14], [15]. Nisin ZP was originally shown to mediate selective apoptosis and cell cycle arrest in OSCCC cells compared to primary oral keratinocytes via specific modulation of calcium ion influxes and CHAC1 signaling [14]. Subsequently, others have shown the same effects of nisin ZP on NSCLC cells, leading to apoptosis, cell cycle arrest, and mitochondrial membrane depolarization [12]. Similar promising outcomes have been observed in hepatocellular carcinoma, where growth inhibition and apoptosis induction have been observed, alongside potential benefits in countering drug resistance mechanisms [13]. Furthermore, nisin has exhibited apoptotic activity through mitochondrial dysfunction and oxidative stress in cervical cancer cells. In the context of HNSCC, both nisin and nisin ZP exhibit anti-tumor effects, with nisin ZP displaying enhanced potency, primarily mediated via a calpain-dependent apoptosis pathway [3], [14]. Despite these significant findings and the proposed calcium ion fluxes and CHAC1 signaling that have been proposed as the mechanistic effects of nisin, the precise mechanisms of nisin's anti-cancer actions warrant further exploration. The NOTCH signaling pathway has been implicated as hyperactive in several cancers. The presence of a Notch1 mutation in the patient suggests that nisin may reduce tumor size via the inhibition of the NOTCH signaling pathway.

Nisin's safety profile and validation enhances its potential as a cancer treatment. Notably, a 90-day subchronic toxicity study in rats found no adverse effects [16]. That study observed no significant adverse effects with 225 mg nisin A/kg body weight per day. The feasibility of large-scale production and purification further strengthens its potential as an adjunct therapy for cancer patients.

4. Conclusion

The alleviation of cancer symptoms following nisin treatment, coupled with its demonstrated selective toxicity against cancer cells, suggests its potential application in cancer treatment. As our understanding of its role in cancer therapy continues to evolve, nisin may prove to be a valuable adjunctive treatment alongside conventional therapies, potentially improving patient outcomes. A phase I/II clinical trial is planned to further investigate the efficacy and safety of nisin as an adjunct treatment for cancer. This National Cancer Institute funded clinical trial with Nisin ZP to treat patients with oral cancer specifically with OSCC is starting to recruit patients in March, 2024 (https://clinicaltrials.gov/study/NCT06097468).

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