Treatment of Metastatic Gastrointestinal Stromal Tumor: A Multidisciplinary Approach

TON - February 2011 Vol 4, No 1 published on February 17, 2011 in Gastrointestinal Cancers
Anne C. Kratz, RN, BSN, OCN
Joseph Bubalo, PharmD, BCPS, BCOP
Assistant Professor of Medicine, Division of Hematology and Medical Oncology, Oncology Clinical Pharmacy Specialist
Oregon Health and Science University Hospital
OHSU Hospital and Clinics
Portland, OR
Lindsay C. Overton, MD
Michael C. Heinrich, MD, FACP

Case Presentation
Chief complaint: Abdominal pain and weight loss for 3 months.

History of present illness: A 53-year-old white man with a history of hyperlipidemia treated with atorva statin originally presented in 2007 to the emergency department with worsening constipation, abdominal pain, and a 20-lb weight loss. Given concerns about diverticular disease or colon cancer, computed tomography (CT) imaging was done that showed a 6-cm small bowel mass with evidence of partial small bowel obstruction. No other masses were visible on CT imaging.

The patient underwent surgical resection. Path ology revealed a gastrointestinal stromal tumor (GIST) with spindle cell morphology, dimensions of 6 cm x 4 cm x 3 cm with 12 mitotic figures per 50 high power fields. Given the primary site, tumor size, and mitotic rate, the patient was believed to have an 85% risk of recurrent disease. At the time of his diagnosis, there were no published data regarding adjuvant therapy, and the patient was monitored clinically for recurrence.

Three years after resection, the patient presented to his primary care provider with abdominal bloating and fatigue. Lab oratory tests revealed worsening iron deficiency anemia. Repeat CT scan showed multiple peritoneal implants; the largest measured 2 cm x 2 cm. A CT-guided biopsy was performed, with pathology consistent with GIST. At that time, mutational testing was performed on the patient’s original surgical tumor specimen, which showed a KIT exon 9 mutation.

He was started on standard-dose imatinib (400 mg/day), and then after 1 month of treatment, his imatinib dose was increased to 400 mg twice daily. Given the interaction between imatinib and atorvastatin, the patient was changed to pravastatin. In addition, the patient was advised to discontinue use of St. John’s wort. The patient was also treated for iron deficiency anemia. Six months later, repeat CT imaging showed decreased size of all peritoneal masses, the largest now 1.0 cm x 0.8 cm.

Medical history: Hyperlipidemia; mild depression treated with St. John’s wort.

Surgical history: Tonsillectomy, 1965; small bowel resection, 2007.

Family history: Mother: 75 years old with diabetes and hypertension.

Father: deceased at age 45 in motor vehicle accident. Paternal uncle: colon cancer at 72. No other family history of cancer.

Social history: Patient is divorced with two grown children. He works as a foreman at a construction site. He quit smoking 30 years ago, with a 10 pack-year history. He drinks 1 to 2 drinks per week and occasionally smokes marijuana.

Medications: Pravastatin, 40 mg by mouth daily; aspirin, 81 mg by mouth daily; daily multivitamin.

Allergies: Penicillin causes hives.

Physical examination: General: Overweight man who appears older than stated age, well groomed in no acute distress.
Vital signs: Temperature: 98.1°F; heart rate: 93 bpm; blood pressure: 134/86 mm Hg; oxygen saturation: 98% on room air; height: 70 inches; weight: 100 kg.
Head, ears, eyes, nose, throat: Pupils equal, round, reactive to light; conjunctiva pale, no sclera icterus; mucous membranes moist.
Neck: Soft, supple; no appreciated jugular venous distension; no cervical, supraclavicular or infraclavicular lymphadenopathy.
Respiratory: Clear to auscultation bilaterally; no wheezing, rhonchi, or rales.
Cardiovascular: Regular rate and rhythm; no murmur, rubs, or gallops noted.
Abdomen: Well-healed midline laparotomy scar noted; normoactive bowel sounds; distended ab domen; no fluid wave appreciated; no tenderness to palpation noted.
Extremities: Trace bilateral edema to ankles.

Laboratory values: White blood cell: 3.2 K/cu mm; hemoglobin: 10.3 g/dL; hematocrit: 30.1%; platelet count: 200 K/cu mm; segmented neutrophils: 63%; lymphocytes: 30%; eosinophils: 2%; basophils: 1%; monocytes: 4%; sodium: 144 mmol/L; potassium: 4.1 mmol/L; chloride: 104 mmol/L; carbon dioxide: 26 mmol/L; blood urea nitrogen: 20 mg/dL; creatinine: 1.1 mg/dL; glucose: 95 mg/dL; ferritin: 21 ng/mL

 


 

Physicians’ perspective
Gastrointestinal stromal tumor (GIST) is the most common sarcoma arising in the abdominal cavity. GIST usually arises from the muscular wall of the stomach, but can arise in the small or large intestine (including the rectum). In the United States, there are an estimated 4000 to 6000 new cases diagnosed annually.1 Before 2000, there was no active medical treatment for metastatic GIST.2 As will be discussed, the introduction of small-molecule tyrosine kinase inhibitors (TKIs) has revolutionized the treatment of GIST. Currently, there are two US Food and Drug Administration (FDA)-approved treatments for advanced GIST: imatinib for first-line treatment, and sunitinib for treatment of patients who are intolerant of imatinib or whose disease has progressed on imatinib therapy. A number of other TKIs have been tested in the third-line or later clinical setting in phase 2 clinical trials. Over all, the prognosis for patients with metastatic GIST has markedly im proved over the past decade, with median survival increasing from an estimated 1 to 1.5 years to the current 4 to 5 years.3-5

A landmark study by Hirota and colleagues in 1998 reported that most GISTs (~80%) harbored a gain of function mutation in the KIT receptor tyrosine kinase (Figure).6 Approximately 8% of GISTs have an activating mutation of the homologous platelet-derived growth factor receptor-alpha (PDGFRα) tyrosine kinase.7 Ten to fifteen percent of adult GISTs lack mutations of KIT or PDGFRα and are referred to as wildtype GIST.1 Shortly thereafter, in vitro data demonstrated the potency of the small-molecule kinase inhibitor imatinib (formerly STI-571) against mutant and wild-type KIT kinases.8 These studies led to the hypothesis that imatinib might be active against advanced GIST. In 2000, imatinib was used on a compassionate basis to treat one patient with metastatic GIST.9 Notably, this patient had a remarkable clinical and imaging response to treatment, leading to further testing in phase 2 studies.10,11 In the pivotal phase 2 study (B2222) leading to FDA approval of imatinib for treatment of GIST, 147 patients were treated in a multicenter study, with 82% of patients having partial response or stable disease.10 Similarly, the European Organisation for Research and Treat ment of Cancer (EORTC) phase 1/2 study reported an overall response rate of 68.1%.12

During the phase 2 studies, various imatinib dosing regimens were used, varying from 400 mg daily to 1000 mg daily. Based on these studies, 800 mg total daily dose was established as the maximally tolerated dose. Parallel phase 3 trials were performed to determine the optimal imatinib dose for treatment of metastatic GIST. Both the EORTC/ Italian/Australasian and the Southwest Oncology Group (SWOG)/National Cancer Institute (NCI) Canada studies compared 400 mg/day with 800 mg/day as the target imatinib dose. The results of these studies have been published separately.5,13 Notably, these two studies were intentionally designed to be evaluated in a meta-analysis (known as MetaGIST), involving a total of 1640 patients. The MetaGIST study found a small but significant progression-free survival (PFS) advantage for patients treated in the high-dose arm (hazard ratio [HR], 0.89; P = .04). No difference was observed between the two arms for overall survival (OS; HR, 1.00; P = .97) or objective response.3

Translational studies using tumor samples from these clinical studies have identified tumor genotype as a strong predictor of clinical benefit for patients with metastatic GIST treated with imatinib. Specifically, patients whose tumor harbors a KIT exon 11 mutation (~70% of GIST) have the highest rates of objective response, PFS, and OS compared with patients whose tumors have no kinase mutations (wild-type GIST, approximately 10%-15% of GIST) or GIST with somatic KIT exon 9 mutations (~10% of patients).14 In the SWOG/NCI Canada study, PFS for these three groups was 24.7 months for KIT exon 11–mutant tumors compared with 16.7 months for wild-type GIST and 12.8 months for patients with KIT exon 9–mutant tumors. In terms of the effect on OS, KIT exon 11–mutant GIST patients had a median OS of 60 months compared with 38.4 months for wild-type GIST patients and 49 months for KIT exon 9– mutant GIST patients.15

The effect of tumor genotype and imatinib dose on clinical outcomes also was analyzed in the MetaGIST study. Within patients in KIT exon 9–mutant GIST, PFS was significantly longer for patients treated in the high-dose arm (P = .017). For patients whose tumor had a different genotype, no difference was observed between treatment arms. In terms of OS, there was a trend toward a survival advantage for patients with KIT exon 9– mutant GIST treated with high-dose therapy (P = .15).3

Overall, imatinib has revolutionized the treatment of GIST, as it has for treatment of chronic myeloid leukemia (CML). For most patients, imatinib 400 mg once daily is the optimal dose (Figure). However, in patients with KIT exon 9–mutant tumors, data support a target dose of 400 mg twice daily. These dosing recommendations have re cently been incorporated into the National Comprehensive Cancer Network clinical practice guidelines for GIST.16 Based on these guidelines, our patient was started on imatinib 400 mg once daily to assess drug tolerance and then underwent dose escalation to 400 mg twice daily after his first month of therapy.

At the time when this patient underwent surgical resection of his primary tumor, there were no data regarding adjuvant therapy with imatinib. Consequently, this patient was monitored for recurrence. However, risk analysis of his tumor (based on size, origin, and mitotic rate) indicated that he had a greater than 85% chance of recurrence.17 It was not until 2009 that data regarding the adjuvant use of imatinib were published by DeMatteo and colleagues.18 This study showed that adjuvant therapy with imatinib prolonged PFS after 1 year of therapy. Currently, patients with intermediate or high-risk resected primary GIST should be considered for treatment with at least 1 year of adjuvant imatinib.16

Notable findings in this patient were iron deficiency and anemia. Iron deficiency is a common finding in GIST patients and usually a consequence of bleeding from the primary tumor. The patient’s anemia is likely due to his iron deficiency, although an element of anemia of chronic disease and/or imatinib-induced myelosuppression also could exist. It is important to recognize and treat iron deficiency in GIST patients, as anemia is a common side effect of imatinib treatment. Patients with metastatic GIST and uncorrected iron deficiency anemia may experience severe anemia and fatigue during imatinib treatment. It is important to recognize that oral iron replacement may not be effective in patients with previous total/subtotal gastrectomy or patients treated with proton pump inhibitors, because an acidic environment is required for iron absorption.

Nurse’s perspective
The initial visit to an oncologist can be a stressful experience. Hearing about one’s cancer diagnosis, assimilating prognosis, treat ment plans, and follow-up care can be emotionally over whelming. Timing of the first ap pointment is critical to the start of treatment but the patient may still be in shock. This shock can be lessened by the oncology nurse specialist. The oncology nurse should assess the patient and care partner’s learning style and educational needs in order to offer appropriate information related to the disease process and treatment plan. If the treatment plan contains oral targeted cancer treatment such as imatinib, the nurse hopes to instill trust and empower the patient to be an active partner in the treatment of their disease. Patients should have easy written access to the clinic phone number to report all side effects and receive reliable phone triage of their symptoms and reported side effects of therapy.

The patient’s imatinib prescription will be written by the physician. An important role of the oncology nurse is to help guide the patient through the maze of insurance authorizations, copays, mail-order pharmacies, and patient-assistance programs. Again, this partnership with the patient instills trust and opens the patient to active participation in his or her care.

Medication adherence strategies are very important with imatinib and other oral agents, because the patient is responsible for his or her own therapy. Skipped doses, patient drug holidays, or simple forgetfulness can all result in suboptimal clinical outcomes, such as loss of tumor response and/or decreased duration of response. Although not as well studied in GIST, patient noncompliance during imatinib treatment of CML has been shown to be a common problem. For example, Wu and colleagues estimated average imatinib medication compliance to be only 79% during a 6-year study of 592 patients. Imatinib noncompliance in CML patients is associated with higher overall healthcare costs and less favorable treatment results.19

Health literacy screening at the onset of therapy and ongoing follow-up is necessary to remove any barriers the patient may have to achieving good medication adherence. Nurses can provide practical tools such as calendars, electronic reminders, and enlisting phone calls from family and friends to ensure adherence to the treatment regimen. By enlisting patients as partners, the oncology nurse, in partnership with the oncology pharmacist, hopes to empower them to learn, question, and report side effects. Each patient should have a planned drug supply (these are expensive medications), guidance for managing side effects, a list of which side effects require prompt follow-up, phone numbers to call, and a plan to integrate this medication into everyday life to improve patient quality of life and to maintain lifestyle expectations.

A patient taking imatinib may experience myriad side effects or none at all.20 Drug side effects can make a patient feel unsure and vulnerable with continuing the treatment plan. Upfront education about side effects and a partnership between the physician/patient/nurse/ pharmacist to manage these effects empowers the patient to report and comply with side-effect management strategies. Common side effects in which the GIST patient receiving imatinib should be counseled on and given management strategies for include gastric irritation with nausea and vomiting and, although rare, gastrointestinal hemorrhage, edema, electrolyte imbalances (especially potassium and magnesium), rashes, alopecia, hepatotoxicity, and liver function test abnormalities. Gastrointestinal side effects can be managed by dosing with food or judicious use of antiemetics, electrolytes with oral supplementation, and edema with salt and fluid management strategies. Rashes often respond to topical corticosteroid or moisturizing creams but should be followed closely as severe bullous reactions (including erythema multiforme and Stevens-Johnson syndrome) have occurred with imatinib. The oncology care team should encourage patients to report side effects and the effectiveness of supportive care interventions to ensure continued ad herence to imatinib therapy.20

Imatinib can also cause bone marrow suppression or have adverse effects on liver enzymes. Patients should expect frequent lab draws to monitor blood counts and liver tests. The nurse should be a partner in explaining the blood test results and the meaning of the values to help patients understand this complex assessment tool.

As will be discussed, patients should understand that oral targeted therapies may interact with other medications they are taking. Patients should be encouraged to disclose all their prescribed and complementary medications.

As partners in therapy, patients should know that becoming pregnant or fathering a child while taking imatinib is not advised. Open discussion of sexuality is always encouraged.

The management of patients being treated for GIST is complicated and requires a multidisciplinary approach. The role of the nurse is pivotal in patient education, side-effect management, and ongoing patient support.

Pharmacist’s perspective
The oncology pharmacist should interact with the patient on a variety of levels to increase medication understanding, safety, and success with imatinib therapy. Not a bly, careful review of drug–drug inter actions between imatinib and other agents is a com mon and im port ant area of focus for on cology pharmacists. In vivo, imatinib is a strong, competitive inhibitor of CYP3A4 and CYP2C9 and a relatively weak inhibitor of CYP2D6. Imatinib is metabolized pri marily by CYP3A4, with minor contributions from CYP1A2, CYP2D6, CYP2C9, and CYP2C19.21 Thus, imatinib is not only affected by CYP3A4 inducers and inhibitors, but it also inhibits the metabolism of other drugs metabolized by CYP3A4. Al though many agents are metabolized via the CYP enzyme systems, these interactions are critically important when the affected medication has a narrow therapeutic margin, is metabolically affected to a large degree, or is a critical element of patient care (Table).

In this case, our patient was taking St. John’s wort, a dietary supplement sometimes used for managing mild depression and a known potent inducer of multiple enzyme systems. In a drug interaction study in 12 healthy volunteers, those taking St. John’s wort had a 43% reduction in the imatinib area under the curve (AUC) from baseline.24 This magnitude of change could significantly diminish the clinical response in our patient.

Other potent inducers (Table) have been shown to affect imatinib to a similar or greater degree and should be avoided when possible. If the inducing agents cannot be avoided, then the dose of imatinib may need to be adjusted upward, but there are no clear guidelines for this situation.

Significant CYP3A4 inhibitors (Table) need to be addressed in a similar fashion. For example, ketoconazole has been shown to raise the AUC of imatinib by 40% after a single dose and could greatly increase side effects in patients in whom the interacting agent was not discontinued or replaced with another agent.25

In this case, the St. John’s wort was discontinued because its clinical benefits were uncertain. The patient also was cautioned to have any additional dietary supplements being contemplated for use reviewed by the team, because there are multiple agents known to modify CYP activity.

With respect to imatinib’s effects on other agents, atorvastatin is a CYP3A4 substrate and imatinib in creases the blood levels of a similarly metabolized statin, simvastatin, by 2 to 3.5-fold. This degree of increased drug exposure can significantly increase the risk for side effects, such as myalgias, hepatotoxicity, and rhabdomyolysis.26 In the current case, we substituted pravastatin for atorvastatin.

This agent is expected to provide similar antilipid benefits, but is only a minor CYP substrate. It is important for the GIST patient care team, especially the oncology pharmacist, to review each medication or nutritional supplement in the patient’s medication list for potential drug–drug interactions and/or overlapping side effects.

Many other medications can be similarly affected, because CYP3A4 is among the most common pathways used for medication metabolism. Medications with narrow therapeutic margins, where small changes in blood level can cause profound physiologic effects, are the most concerning when reviewing for drug interactions. For example, although imatinib inhibition of CYP2C9 is not as significant as its effects on CYP3A4, CYP2C9 is the primary enzyme that metabolizes warfarin. Imatinib treatment can inhibit CYP2C9 sufficiently to decrease warfarin metabolism and cause patients to become excessively anticoagulated and at increased risk for bleeding events. Each medication or supplement that a patient is receiving should be reviewed in a similar manner to look for common CYP substrates (Table) and to assess the risk of interaction or overlapping side effects. Patients should be advised to contact the oncology care team whenever any change in medication profile is considered (including both adding and subtracting medications).

Conclusions
The introduction of TKIs has revolutionized the treatment of metastatic GIST. However, obtaining optimal treatment results requires a multidisciplinary approach by physicians, oncology nurses, and oncology pharmacists. In particular, patient education to ensure medical compliance, and successfully manage side effects and concomitant medications are critical elements for successful treatment of patients with GIST. Although this review has emphasized first-line treatment of metastatic GIST with imatinib, similar multidisciplinary coordination of care is required when using sunitinib for second-line treatment of metastatic GIST.
Disclosures
Funding was provided in part by a Merit Review Grant from the Veterans Affairs Administration (MCH) as well as from the GIST Cancer Research Fund (MCH) and the Life Raft Group (MCH).

All potential conflicts of interest have been reviewed and managed by Conflict of Interest Committees at the Portland VA Medical Center and the Oregon Health and Science University.

References

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Last modified: May 21, 2015