A Clinical Study of Sorafenib Combined With Gefitinib for the Treatment of pNET

The incidence rate of pancreatic neuroendocrine neoplasms (pNENs) is increasing year by year. According to the statistical results of the SEER (Surveillance, Epidemiology, and End Results) database, the incidence rate of pNENs increased from 0.27/100000 to 1/100000 from 2000 to 2016, with a median overall survival time of 68 months. The 5-year overall survival rates of localized, locally advanced, and metastatic pNENs were 83%, 67%, and 28%, respectively. pNENs are gradually gaining attention and importance from the medical community. The existing therapeutic drugs for neuroendocrine tumors include somatostatin analogues, recombinant human interferon injections, chemotherapy drugs, and molecular targeted drugs. Although these drugs can prolong patients' PFS to some extent, there is a common problem of low objective response rates. In recent years, sunitinib and everolimus have been approved for targeted therapy in patients with pancreatic neuroendocrine neoplasms , but their clinical efficacy is still limited. The study by Panzuto et al. showed that the median PFS for first-line treatment of advanced well differentiated pancreatic neuroendocrine neoplasms was 13.9 months, with an ORR of 14.9%. After imaging progression of the disease, the median PFS after second-line treatment was 15 months, and the ORR of only 5.5%. There is currently no effective treatment for patients with disease progression or drug resistance after undergoing existing treatment ways. Therefore, there is a huge clinical demand for the treatment of pNEN patients worldwide, and effective drugs are urgently needed to benefit these patients. Our previous research found that pathways in tumor were significantly affected in pNENs and liver metastases and EGFR tyrosine kinase inhibitor resistance and transcriptional dysregulation in tumor were unique to liver metastasis through KEGG pathway analysis; Meanwhile, GO Biological Processes analysis emphasizes those signaling pathways closely related to tyrosine phosphorylation, DNA repair, and cell cycle regulation, especially in liver metastases. Xiao et al. found that epidermal growth factor receptor (EGFR) was enriched in high glycosylation pNENs using RNA-seq. EGFR was expressed in 21.2% of pNENs using immunohistochemistry and associated with poor overall survival. Therefore, the study from Xiao et al. demonstrates that EGFR may be a potential therapeutic target for pNENs. This is consistent with our previous findings that the EGFR signaling pathway plays an important role in pNENs with liver metastases. Due to the heterogeneity and complexity of tumors, the efficacy of monotherapy or blocking a single signaling pathway may be limited or this treatment method may easily develop drug resistance. The existing anti-tumor targeted drugs block tumor angiogenesis by inhibiting vascular endothelial growth factor (VEGF) and fibroblast growth factor (FGF). Colony-stimulating factor 1 receptor (CSF1R) is an important signaling pathway associated with the survival and function of tumor associated macrophages (TAMs). Inhibiting CSF1R can regulate the activity of macrophages, improve the immune microenvironment, promote immune response, and activate the body's immune function. Sofantinib is a novel oral tyrosine kinase inhibitor which exerts dual effects of anti-tumor angiogenesis and immune regulation by targeting VEGFR, FGFR1, and CSF1R, resulting in synergistic anti-tumor activity. In December 2020 and June 2021, sorafenib was approved in China as a monotherapy for unresectable locally advanced or metastatic, well differentiated extrapancreatic and pancreatic neuroendocrine neoplasms. However, in a multicenter, single blind, open label, phase Ib/II clinical trial, the objective response rate for pNENs patients was only 19%. There is currently no effective treatment available for patients with disease progression or drug resistance after undergoing existing treatment regimens. Therefore, there is an urgent need to seek new treatment methods to improve the therapeutic effect of pNENs. Based on our previous research results and relevant literature reports, we speculate that the combination of sorafenib and EGFR inhibitor gefitinib may improve the therapeutic effect of pNENs patients.

Sex

All

Minimum age

18 Years

Maximum age

80 Years

Inclusion Criteria:

1. Patients must have a full understanding of this study and voluntarily sign an informed consent form;
2. Age ≥ 18 years old and age ≤ 80 years old;
3. Patients with pancreatic neuroendocrine tumors diagnosed by histopathology or cytology, who have progressed after previous treatments such as SSA, targeted therapy, and chemotherapy (all grades of pancreatic neuroendocrine tumors and neuroendocrine cancers are allowed to be included);
4. According to the criteria for evaluating the efficacy of solid tumors (RECIST V1.1), there should be at least one measurable lesion;
5. At least 7 days have passed since the end of the last systemic treatment, and palliative radiotherapy for localized areas is allowed. It has been completed for more than 4 weeks;
6. Expected survival time ≥ 12 weeks;
7. Researchers estimate that patients can benefit from it;
8. The patients have sufficient organ and bone marrow function;
9. Male or female patients with fertility voluntarily use effective contraceptive methods, such as double barrier contraception, condoms, oral or injectable contraceptives, intrauterine devices, etc., during the study period and within 6 months of the last study medication. All female patients will be considered to have fertility unless they have undergone natural menopause, artificial menopause, or sterilization surgery (such as hysterectomy, bilateral adnexectomy, or radiation ovarian irradiation).

Exclusion Criteria:

1. Other malignant tumors have been diagnosed in the past 5 years, except for effectively treated skin basal cell carcinoma, skin squamous cell carcinoma, or effectively resected cervical carcinoma in situ, breast cancer;
2. Simultaneously receiving other investigational drugs or approved or investigational anti-tumor treatments;
3. Patients with contraindications to experimental drugs (such as active bleeding, ulcers, intestinal perforation, intestinal obstruction, uncontrolled hypertension, III-IV grade heart failure, within 30 days after major surgery, severe liver and kidney dysfunction, etc.);
4. The patient currently has any diseases or conditions that affect drug absorption, or the patient is unable to take oral medication;
5. Confirmed allergy to any component of the investigational drug and/or its excipients;
6. Pregnant (positive pregnancy test before medication) or breastfeeding women;
7. Patients with large amounts of pleural effusion or ascites requiring drainage;
8. Any other disease with clinically significant metabolic abnormalities, physical examination abnormalities, or laboratory examination abnormalities. According to the researcher's judgment, it is suspected that the patient has a certain disease or condition that is not suitable for the use of the study drug (such as having seizures and requiring treatment), or that it will affect the interpretation of the study results, or put the patient in a high-risk situation;
9. Have taken medication containing components of Hypericum perforatum within 3 weeks prior to the first study medication. Or have taken other strong inducers or inhibitors of CYP3A4 within the previous 2 weeks;
10. According to the judgment of the investigator, the subject has other factors that may lead to the forced termination of this study or are not suitable for inclusion, such as other serious concomitant diseases (such as severe diabetes, thyroid disease, spinal cord compression, superior vena cava syndrome, mental illness), serious laboratory examination abnormalities, accompanied by family or social factors, which will affect the safety of the subject, or the collection of data and samples).

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