Dr. Shaheen specializes in the gastrointestinal malignancies and she has expertise in treating neuroendocrine tumors (NETs). Following her fellowship in Hematology and Oncology, Dr Shaheen completed an advanced fellowship in Neuroendocrine tumors from Stanford University. The NET advanced fellowship is first of its kind in United State started under the leadership of Dr Pamela Kunz who is the founding Director of the Stanford Neuroendocrine Tumor Program established in 2015. After completing her advanced fellowship, Dr Shaheen joined Stanford Oncology division as Clinical Assistant Professor. Dr Shaheen is involved in further developing the neuroendocrine oncology program at Stanford which serves as a centre of excellence in the treatment of neuroendocrine tumors. Dr Shaheen is actively involved in clinical research and clinical trials. Dr Shaheen is also involved in taking care of patients admitted to the oncology service as well as resident and fellow teaching.
- Medical Oncology
Board Certification: American Board of Internal Medicine, Internal Medicine (2010)
Fellowship: Stanford Hospital and Clinics Neuro-Oncology Fellowship CA
Board Certification: American Board of Internal Medicine, Medical Oncology (2018)
Fellowship: Loma Linda University Hematology and Medical Oncology Fellowship (2018) CA
Residency: St Joseph Hospital Internal Medicine Residency (2010) IL
Medical Education: MGM Medical College (2004) India
Fellowship, Stanford University, Neuroendocrine Tumor Fellowship (2019)
Fellowship, Loma Linda University, Hematology and Oncology Fellowship (2018)
Residency, Saint Joseph University of Illinois at Chicago, Internal Medicine (2010)
Internship, Government Medical College, Kashmir, Internship (2003)
Medical Education, MGM Medical College, India, Bachelor of Medicine and Surgery (2002)
Board Certification, American Board of Internal Medicine, Medical Oncology (2018)
Board Certification, American Board of Internal Medicine, Internal Medicine (2010)
Testing Cabozantinib in Patients With Advanced Pancreatic Neuroendocrine and Carcinoid Tumors
This randomized phase III trial studies cabozantinib to see how well it works compared with placebo in treating patients with neuroendocrine or carcinoid tumors that have spread to other places in the body (advanced). Cabozantinib is a chemotherapy drug known as a tyrosine kinase inhibitor, and it targets specific tyrosine kinase receptors, that when blocked, may slow tumor growth.
Capecitabine, Temozolomide, and Bevacizumab for Metastatic or Unresectable Pancreatic Neuroendocrine Tumors
The purpose of this research is to evaluate the effectiveness and safety of a combination of capecitabine, temozolomide and bevacizumab in the treatment of advanced pancreatic neuroendocrine tumors.
Stanford is currently not accepting patients for this trial. For more information, please contact Ben Priestley, 650-723-2990.
Chromogranin A as Blood Marker in Cancer Patients
Gastroentero-pancreatic neuroendocrine tumors (GEP-NETs) are a heterogenous group of neoplasms that arise from enterochromaffin cells of the gastrointestinal (GI) tract and pancreas. They account for 50-70% of all incident NETs. Due to the lack of symptoms in the early stage of disease and the frequency of nonspecific GI symptoms, GEP-NETs are difficult to diagnose. Identification of effective biomarkers (such as Chromogranin A) to improve GEP-NET diagnosis, as well as to assess treatment efficacy, relapse and prognosis, is important for improving outcomes for patients with GEP-NETs. The purpose of this study is to validate the performance of Brahms (BRAHMS) Chromogranin A II Kryptor (KRYPTOR) assay to monitor the course of disease in patients with well-defined GEP-NETs.
Stanford is currently not accepting patients for this trial. For more information, please contact Kathleen Hornbacker, 650-721-4108.
Cisplatin, Carboplatin and Etoposide or Temozolomide and Capecitabine in Treating Patients With Neuroendocrine Carcinoma of the Gastrointestinal Tract or Pancreas That Is Metastatic or Cannot Be Removed by Surgery
This randomized phase II trial studies how well temozolomide and capecitabine work compared to standard treatment with cisplatin or carboplatin and etoposide in treating patients with neuroendocrine carcinoma of the gastrointestinal tract or pancreas that has spread to other parts of the body (metastatic) or cannot be removed by surgery. Drugs used in chemotherapy, such as temozolomide, capecitabine, cisplatin, carboplatin and etoposide, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Certain types of neuroendocrine carcinomas may respond better to treatments other than the current standard treatment of cisplatin and etoposide. It is not yet known whether temozolomide and capecitabine may work better than cisplatin or carboplatin and etoposide in treating patients with this type of neuroendocrine carcinoma, called non-small cell neuroendocrine carcinoma.
Stanford is currently not accepting patients for this trial. For more information, please contact Cancer Clinical Trials Office (CCTO), 650-498-7061.
Pazopanib Hydrochloride in Treating Patients With Progressive Carcinoid Tumors
This randomized phase II trial studies how well pazopanib hydrochloride works in treating patients with carcinoid tumors that are growing, spreading, or getting worse. Pazopanib hydrochloride may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth.
Stanford is currently not accepting patients for this trial. For more information, please contact Ben Priestley, 650-723-2990.
Striking Size Reduction of Rapidly Growing Pancreatic Neuroendocrine Carcinoma Metastatic Nodal Conglomerate After Only 2 Cycles of 177Lu-DOTATATE.
Clinical nuclear medicine
ABSTRACT: Peptide receptor radionuclide therapy (PRRT) with 177Lu-DOTATATE has shown great treatment efficacy in patients with well-differentiated metastatic neuroendocrine tumors and a metastatic size reduction of ~20% for metastatic lesions <3 cm in size. We present a 66-year-old man with pancreatic neuroendocrine carcinoma, who had a rapidly growing metastatic nodal conglomerate, which measured close to 10 cm in size. After only 2 cycles of PRRT with 177Lu-DOTATATE, the nodal conglomerate had a striking size reduction greater than 75%. This case highlights the potential efficacy of PRRT with 177Lu-DOTATATE for treatment of aggressive neuroendocrine neoplasms.
View details for DOI 10.1097/RLU.0000000000004262
View details for PubMedID 35695695
Evaluation of Liver and Renal Toxicity in Peptide Receptor Radionuclide Therapy for Somatostatin Receptor Expressing Tumors: A 2-Year Follow-Up.
Peptide receptor radionuclide therapy (PRRT) with radiolabeled somatostatin receptor (SSR) analogs is now an established systemic treatment for neuroendocrine tumors (NET). However, more short- and long-term data about renal and hepatotoxicity is needed. Here we present our experience in this clinical scenario.Eighty-six patients with progressive SSR-expressing malignancies underwent PRRT with Lu-177 Dotatate and were followed up for up to 2 years. Laboratory tests were done 1 week before each cycle and every 2 months at follow-up. Hepatic and renal toxicity was determined based on NCI CTCAE V5.0.55/86 (64%) patients completed all 4 cycles of PRRT; 18/86 (20.9%) are currently being treated; 13/86 (15.1%) had to discontinue PRRT: 4/13 (31%) due to hematologic toxicity, 9/13 (69%) due to non-PRRT-related comorbidities. Out of the patients who finished treatment, only transient grade 2 toxicities were observed during PRRT: hypoalbuminemia in 5.5% (3/55), and renal toxicity (serum creatinine and estimated glomerular filtration rate) in 1.8% (1/55). No grade 3 or 4 liver and renal toxicity occurred. Patients presenting with impaired liver or renal function prior to PRRT, either improved or had stable findings. No deterioration was observed.Peptide receptor radionuclide therapy does not have a negative impact on liver and renal function, even in patients with pre-existing impaired parameters. No grade 3 or 4 hepatic or renal toxicity was identified. Only transient grade 2 hypoalbuminemia in 5.5% and nephrotoxicity in 1.8% of patients were seen during PRRT.
View details for DOI 10.1093/oncolo/oyab072
View details for PubMedID 35641196
- Evaluation of Liver and Renal Toxicity in Peptide Receptor Radionuclide Therapy for Somatostatin Receptor Expressing Tumors: A 2-Year Follow-Up ONCOLOGIST 2022
Peptide Receptor Radionuclide Therapy (PRRT) in Advanced Pheochromocytoma and Paraganglioma From a Single Institution Experience
LIPPINCOTT WILLIAMS & WILKINS. 2022: E42-E43
View details for Web of Science ID 000819123700057
- Phase II trial of organ preservation program using short-course radiation and folfoxiri for rectal cancer (SHORT-FOX) LIPPINCOTT WILLIAMS & WILKINS. 2022
Neuroendocrine and Adrenal Tumors, Version 2.2021, NCCN Clinical Practice Guidelines in Oncology.
Journal of the National Comprehensive Cancer Network : JNCCN
2021; 19 (7): 839-868
The NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines) for Neuroendocrine and Adrenal Gland Tumors focus on the diagnosis, treatment, and management of patients with neuroendocrine tumors (NETs), adrenal tumors, pheochromocytomas, paragangliomas, and multiple endocrine neoplasia. NETs are generally subclassified by site of origin, stage, and histologic characteristics. Appropriate diagnosis and treatment of NETs often involves collaboration between specialists in multiple disciplines, using specific biochemical, radiologic, and surgical methods. Specialists include pathologists, endocrinologists, radiologists (including nuclear medicine specialists), and medical, radiation, and surgical oncologists. These guidelines discuss the diagnosis and management of both sporadic and hereditary neuroendocrine and adrenal tumors and are intended to assist with clinical decision-making. This article is focused on the 2021 NCCN Guidelines principles of genetic risk assessment and counseling and recommendations for well-differentiated grade 3 NETs, poorly differentiated neuroendocrine carcinomas, adrenal tumors, pheochromocytomas, and paragangliomas.
View details for DOI 10.6004/jnccn.2021.0032
View details for PubMedID 34340212
Prevalence of Bone Metastases in Neuroendocrine Neoplasms by 68Ga DOTATATE PET Scan
LIPPINCOTT WILLIAMS & WILKINS. 2020: 486
View details for Web of Science ID 000526823600114
Patient Selection and Toxicities of PRRT for Metastatic Neuroendocrine Tumors and Research Opportunities.
Current treatment options in oncology
2020; 21 (4): 25
Neuroendocrine tumors (NETs) are a heterogenous group of neoplasms characterized by varied biological hallmarks and behavior, ranging from indolent to aggressive. For many decades, somatostatin analogues and few targeted therapies were available for NETs and these therapies had minimal response rates. However, there have been a number of recent treatment advances. Peptide receptor radionuclide therapy (PRRT) is a novel approach to treatment of NETs and has changed the landscape of treatment for NETs. It is a form of targeted therapy in which a radiolabeled somatostatin analogue delivers radiation specifically to tumor cells expressing the somatostatin receptor.
View details for DOI 10.1007/s11864-020-0711-9
View details for PubMedID 32172368
Targeted and novel therapy in advanced gastric cancer
EXPERIMENTAL HEMATOLOGY & ONCOLOGY
2019; 8 (1): 25
The systemic treatment options for advanced gastric cancer (GC) have evolved rapidly in recent years. We have reviewed the recent data of clinical trial incorporating targeted agents, including inhibitors of angiogenesis, human epidermal growth factor receptor 2 (HER2), mesenchymal-epithelial transition, epidermal growth factor receptor, mammalian target of rapamycin, claudin-18.2, programmed death-1 and DNA. Addition of trastuzumab to platinum-based chemotherapy has become standard of care as front-line therapy in advanced GC overexpressing HER2. In the second-line setting, ramucirumab with paclitaxel significantly improves overall survival compared to paclitaxel alone. For patients with refractory disease, apatinib, nivolumab, ramucirumab and TAS-102 have demonstrated single-agent activity with improved overall survival compared to placebo alone. Pembrolizumab has demonstrated more than 50% response rate in microsatellite instability-high tumors, 15% response rate in tumors expressing programmed death ligand 1, and non-inferior outcome in first-line treatment compared to chemotherapy. This review summarizes the current state and progress of research on targeted therapy for advanced GC.
View details for DOI 10.1186/s40164-019-0149-6
View details for Web of Science ID 000489720300002
View details for PubMedID 31632839
View details for PubMedCentralID PMC6788003
- Concomitant KRAS and BRAF mutations in colorectal cancer JOURNAL OF GASTROINTESTINAL ONCOLOGY 2019; 10 (3): 577–81
Conservative management of nivolumab-induced pericardial effusion: a case report and review of literature.
Experimental hematology & oncology
2018; 7: 11
Nivolumab is an immune checkpoint inhibitor targeting programmed death-1 protein and has been approved for the treatment of multiple advanced malignancies. Adverse effects of immune checkpoint inhibitors are distinct from conventional cytotoxic chemotherapy and can be life-threatening if left unrecognized. Here, we present a case of nivolumab-induced pericardial effusion successfully managed with high-dose corticosteroids.A 70-year-old Caucasian female with a history of 50-pack-year cigarette smoking was diagnosed of recurrent adenocarcinoma of lung after initial surgery. She progressed through multiple lines of chemotherapy and was eventually started on nivolumab. She developed a large pericardial effusion, grade 3 by Common Terminology Criteria for Adverse Events v4.0, about 4 days after receiving first nivolumab treatment. She was treated with oral prednisone at 1 mg/kg daily with gradual resolution of pericardial effusion over 5 weeks while she still received nivolumab every 2 weeks. Prednisone treatment was eventually tapered off about 10 weeks from initial nivolumab treatment. However 1 week after stopping prednisone, she again presented with shortness of breath and bilateral ankle edema, imaging confirmed recurrent pericardial effusion measuring 2.8 cm. Nivolumab was stopped and patient was again started back on prednisone 1 mg/kg daily which resulted in complete resolution of pericardial effusion in 3 weeks. Nivolumab was resumed 1 week afterwards while patient was on tapering dose of prednisone. There was no recurrent pericardial effusion when she continued low-dose prednisone during the remaining course of nivolumab treatment.With increasing use of immune checkpoint inhibitors, clinicians need to be aware of the unusual immune-related adverse events in order to provide timely management and effective patient care. To our knowledge, this is the first reported case of immune-related pericardial effusion from nivolumab successfully managed with high-dose corticosteroids. Furthermore, recurrent pericardial effusion was prevented by using low-dose corticosteroids as maintenance in order for patient to continue nivolumab treatment.
View details for DOI 10.1186/s40164-018-0104-y
View details for PubMedID 29761026
View details for PubMedCentralID PMC5941729
Characterization of disease progression in ovarian cancer by utilizing 'chemograms' of ovarian cancer stem cells.
Journal of chemotherapy (Florence, Italy)
2013; 25 (3): 184-91
Ovarian cancer is one of the leading causes of death in women with cancer. First-line chemotherapy with platinum compounds and taxane compounds has been effective, but most patients develop a relapse of the disease due to drug resistance. There is growing evidence that this resistance may be due to the presence of ovarian cancer stem cells.Cells with properties of cancer stem cells have been isolated from the ascitic fluid of ovarian cancer patients. This subset of cells is highly tumourigenic compared to the rest of the cells in the ascitic fluid. They are known to exude harmful chemicals from their cytoplasm and have been found to be resistant to chemotherapeutic agents. This property has been utilized to purify them by fluorescence assisted cytometry to yield a subset of cells which are called 'side population'. These cells exhibit the properties of cancer stem cells and their role in disease progression is being currently investigated. The course of the disease can be potentially characterized at the cellular level by closely studying this cell population. They can also be cultured in different combinations of chemotherapeutic agents at varying concentrations to obtain 'chemograms' which are sensitivity charts. Chemotherapeutic agents which produce the most effective kill curves can then be rationally used as a second-line chemotherapy if the disease relapses. These sensitivity charts can provide insight into emerging patterns of chemoresistance and also help discover surface markers that accurately identify ovarian cancer stem cells.The high rate of disease relapse in patients with ovarian cancer requires a new and different approach utilizing the sensitivity of cancer stem cells. Isolating and characterizing the resistance patterns of ovarian cancer stem cells may provide a rational approach towards an effective and individualized chemotherapeutic regimen.
View details for DOI 10.1179/1973947812Y.0000000058
View details for PubMedID 23783145
Secondary mucosa-associated lymphoid tissue (MALT) lymphoma of the colon.
Medical oncology (Northwood, London, England)
2013; 30 (2): 502
Mucosa-associated lymphoid tissue (MALT)-type lymphomas most commonly occur in the stomach and have been associated with Helicobacter pylori infection. However, MALT-type lymphoma of the colon is a rare entity. It commonly manifests with symptoms of weight loss, low-grade fever, constipation, melena, and hematochezia. Unlike gastric lymphoma, it is difficult to detect MALT-type lymphoma of the colon by imaging. Colonoscopy may reveal lesions whose biopsy most commonly shows abundant B lymphocytes. There is no universal immunohistochemistry profile for MALT-type lymphoma but CD 20 staining is commonly seen. Trisomies and translocations have been described and their presence has been correlated with treatment response. Due to the rarity of colonic MALT-type lymphoma, no standard guidelines are available for its management. It often occurs individually and rarely occurs simultaneously with concurrent colon adenocarcinoma. This case report describes the presentation and clinical course of a secondary MALT-type lymphoma in a patient who underwent colectomy for a prior colon adenocarcinoma.
View details for DOI 10.1007/s12032-013-0502-2
View details for PubMedID 23423787
Gastrointestinal stromal tumor: a rare abdominal tumor.
Case reports in oncology
2013; 6 (1): 148-53
Gastrointestinal stromal tumors (GISTs) are rare abdominal tumors which arise from the interstitial cells of Cajal in the gastrointestinal tract. Gastric GISTs are the most commonly seen GIST tumors and may grow to a very large size. They are often associated with abdominal pain, anorexia and weight loss. Most of them can be detected by CT. These tumors have been found to harbor mutations in CD117 which causes constitutional activation of the tyrosine kinase signaling pathway and is considered to be pathognomic. Tyrosine kinase inhibitors such as imatinib have revolutionized the treatment of these tumors, which are otherwise resistant to conventional chemotherapy and radiotherapy. Although surgical resection is the mainstay of treatment, tyrosine kinase inhibitors have been useful in prolonging the recurrence-free survival of these patients. Resistance to imatinib has been reported in GISTs with specific mutations. We present a case of gastric GIST which grew to a very large size and was associated with abdominal pain and weight loss. It was successfully resected and the patient was commenced on imatinib therapy.
View details for DOI 10.1159/000350061
View details for PubMedID 23569450
View details for PubMedCentralID PMC3618098
Uterine leiomyosarcoma manifesting as a tricuspid valve mass.
Case reports in oncology
2013; 6 (1): 119-26
Uterine leiomyosarcoma is a rare malignancy and carries a poorer prognosis when compared to endometrial carcinoma. It has been observed to metastasize to all the major organs. It presents with symptoms of abdominal distension, vaginal bleeding and may pass unnoticed until an advanced stage in patients with leiomyomas. Surgery is a viable option in patients with disease limited to the uterus, but metastasis to the heart may require surgery to prevent acute and catastrophic complications. The case described here involves metastasis to the tricuspid valve, which caused severe tricuspid regurgitation in the setting of acute pulmonary embolism. Surgical resection restored cardiac function and stabilized the patient. This case illustrates a rare site of metastasis of leiomyosarcoma which required immediate intervention and resulted in a favorable outcome.
View details for DOI 10.1159/000346935
View details for PubMedID 23569446
View details for PubMedCentralID PMC3618104
Extracavitary manifestation of primary effusion lymphoma as a right atrial mass.
Case reports in oncology
2013; 6 (1): 114-8
Primary effusion lymphoma (PEL) is a subset of large B cell lymphomas and has been mostly associated with human immunodeficiency virus infection. Rare cases have been reported in organ transplant recipients and chronic hepatitis C patients. It typically presents as an effusion in the pleural and pericardial spaces but rarely disseminates. However, involvement of the gastrointestinal tract, lymph nodes and bone marrow has been reported. Diagnosis is based on characteristic clinical, histopathological and immunohistochemical features. We present a case with a right atrial mass which tested positive for human herpes virus 8 (HHV-8), CD20, CD30 and lambda light chains and negative for CD138, kappa light chain, PAX5, Epstein-Barr virus, latent membrane protein 1, CD2, CD3, CD8 and CD56. Bilateral pleural effusions and pericardial effusions were noted which tested positive for HHV-8, CD30 and CD45. The patient responded well to the R-EPOCH regimen with complete resolution of the effusions and a significant decrease in the size of the right atrial mass. This case report illustrates the atypical manifestation of PEL as a right atrial mass.
View details for DOI 10.1159/000346838
View details for PubMedID 23569445
View details for PubMedCentralID PMC3618032
Cutaneous metastasis of uterine adenocarcinoma: a case report and review of the literature.
2009; 84 (1): 33-8
Cutaneous metastases from cancer are relatively uncommon in clinical practice but when present may herald the diagnosis of internal malignancy. The most common sources of primary cancer are the breasts, lungs, large bowel, oral cavity, kidneys, stomach, ovaries, and malignant melanoma. Despite the high incidence of uterine adenocarcinoma, cutaneous metastases are uncommon. The most common presentation of cutaneous metastases is rapidly developing nodules or tumors. The diagnosis of cutaneous metastatic carcinoma hinges on histopathologic evaluation of the involved skin. We discuss and review the diagnosis and management of cutaneous metastasis of uterine adenocarcinoma.
View details for PubMedID 19743722
Melanotic neuroectodermal tumor of infancy: review of literature and case report.
Journal of pediatric surgery
2008; 43 (6): E25-9
Melanotic neuroectodermal tumor of infancy (MNTI) is an uncommon, fast-growing, pigmented neoplasm of neural crest origin. It primarily affects the maxilla of the infants during the first year of life. Approximately, a few hundred of these tumors have been reported in medical literature. We present a case of a newborn with MNTI involving the anterior maxillary region. The treatment included surgical excision of the lesion with safe margins, using an intraoral approach and removal of associated developing tooth buds. We made no attempt at immediate bone grafting. The patient had no recurrence at 1 year postoperatively. The diagnostic features and management alternatives of MNTI are discussed.
View details for DOI 10.1016/j.jpedsurg.2008.02.068
View details for PubMedID 18558161