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Physical and chemical stability of pemetrexed solutions in plastic syringes.

BACKGROUND: Pemetrexed is a multitargeted antifolate antineoplastic agent that is indicated for single-agent use in advanced or metastatic non-small-cell lung cancer and in combination with cisplatin for the treatment of malignant pleural mesothelioma not treatable by surgery. Currently, there is no information on the long-term stability of pemetrexed solutions beyond 24 hours. OBJECTIVE: To evaluate the stability of pemetrexed reconstituted with NaCl 0.9% injection to a concentration of 25 mg/mL and packaged in polypropylene syringes. METHODS: Triplicate samples of reconstituted pemetrexed 25 mg/mL were packaged in 20-mL polypropylene syringes and evaluated for physical and chemical stability performed initially and over 2 days of storage at 23 degrees C and over 31 days of storage at 4 degrees C. Physical stability was assessed using turbidimetric and particulate measurement, as well as visual observation. Chemical stability was evaluated by HPLC. RESULTS: The reconstituted pemetrexed solutions remained physically and chemically stable throughout the respective study periods, with no precipitation or color change and little or no loss of pemetrexed. CONCLUSIONS: Pemetrexed reconstituted with NaCl 0.9% to a concentration of 25 mg/mL packaged in polypropylene syringes was found to be stable for 2 days at room temperature and 31 days refrigerated.

Antimetabolites, Antineoplastic↗

Pemetrexed (Alimta): improving outcomes in malignant pleural mesothelioma.

During the past four decades, chemotherapy has failed to demonstrate a consistent clinical benefit for patients with unresectable or recurrent malignant pleural mesothelioma (MPM). Consequently, there has been no standard chemotherapy nor US Food and Drug Administration (FDA)-approved drug for patients with this disease. The introduction of pemetrexed (Alimta, Eli Lilly), a multitargeted antifolate agent, has improved the outlook for patients with mesothelioma by demonstrating a positive impact on quality of life and by prolonging survival. Pemetrexed is the first FDA-approved drug for the treatment of MPM. The combination of cisplatin plus pemetrexed is now the standard of care for the treatment of the disease. Furthermore, supplementation with vitamin B12 and folate has vastly improved the toxicity profile of pemetrexed. This article summarizes historical chemotherapy trials in MPM; discusses key features of clinical trial design for MPM; summarizes the results of a landmark Phase III trial of pemetrexed and cisplatin in MPM; discusses the relative contributions of pemetrexed and cisplatin to the regimen; explains the importance of vitamin supplementation of pemetrexed; and provides direction for future clinical trials in this disease.

Antimetabolites, Antineoplastic↗

Pemetrexed: a novel antifolate agent enters clinical practice.

Pemetrexed (Alimta, Eli Lilly) is a multitargeted antifolate that inhibits at least three enzymes in the nucleic acid synthetic pathways. The US Food and Drug Administration recently approved pemetrexed, in combination with cisplatin, for the first-line treatment of advanced malignant pleural mesothelioma. Moreover, pemetrexed was recently shown to be as efficacious as docetaxel (Taxotere, Aventis) in the second-line treatment of non-small cell lung cancer, and its toxicity profile was preferable. The main toxicity seen with pemetrexed is myelosuppression, which is considerably reduced by coadministration of folic acid and vitamin B12. Multiple Phase II clinical trials have demonstrated that pemetrexed has promising single-agent activity in many other solid tumors, including head and neck, breast and colorectal cancers. Combination regimens consisting of pemetrexed and other chemotherapeutics or novel molecular-targeted agents are currently under investigation. Future studies will better define and likely expand the role of pemetrexed for the treatment of cancer.

Antimetabolites, Antineoplastic↗

Pemetrexed: its promise in treating non-small-cell lung cancer.

The use of chemotherapy in the treatment of early and advanced non-small-cell lung cancer (NSCLC) has increased during the past decade. One of the main reasons for the increased acceptance of chemotherapy is the development of several new cytotoxic agents with a unique mechanism(s) of action and high single-agent activity, combined with a favorable toxicity profile. Pemetrexed (Alimta) is a novel antifolate that inhibits several enzymes involved in DNA synthesis (thymidylate synthase [TS], dihydrofolate reductase [DHFR], and glycinamide ribonucleotideformyltransferase [GARFT]). Pemetrexed's toxicity is markedly reduced by folic acid and vitamin B12 supplementation. The compound has been studied extensively in various tumor types, including NSCLC. In NSCLC, pemetrexed at 500 mg/m2, every 3 weeks, given i.v. over 10 minutes, has shown promising activity, and can safely be administrated with vitamin supplementation. After registration, single-agent pemetrexed will certainly add to the chemotherapeutic options available for pretreated patients and will most likely change significantly chemotherapy prescriptions in second-line chemotherapy. In first-line chemotherapy, the role of platinum-based and -free combination doublet chemotherapy with pemetrexed still needs to be defined. Phase II data indicate high efficacy combined with favorable toxicity for pemetrexed in combination with cisplatin, carboplatin (Paraplatin), oxaliplatin (Eloxatin), gemcitabine (Gemzar), and vinorelbine (Navelbine). This review summarizes the clinical experience obtained thus far during the early clinical development of pemetrexed in NSCLC.

Antineoplastic Combined Chemotherapy Protocols↗

Overview of phase I/II pemetrexed studies.

Pemetrexed (Alimta) is an antifolate that is effective in the inhibition of multiple enzyme targets including thymidylate synthase, dihydrofolate reductase, and glycinamide ribonucleotide formyl transferase. The compound has been evaluated in several phase I trials, both as single agent and in combination with other cytotoxic agents. The initial schedule selected for further investigation in phase II trials was pemetrexed 600 mg/m2 as a 10-minute infusion on day 1 every 21 days. During the subsequent phase II development the dose of pemetrexed was adjusted to 500 mg/m2 due to bone marrow and gastrointestinal toxicities. The adjusted dose of pemetrexed was well tolerated throughout the late-phase drug development program. Preclinical evidence suggests that pemetrexed has additive or synergistic activity when combined with many other clinically important anticancer agents, including gemcitabine (Gemzar), fluorouracil, carboplatin (Paraplatin), oxaliplatin (Eloxatin), paclitaxel, and vinorelbine (Navelbine). Dose-limiting toxicities in these studies were primarily hematologic, and there was no evidence of cumulative hematologic toxicity. During the drug development program it was discovered that supplementation with folic acid and vitamin B12 profoundly increased the tolerability of pemetrexed. The studies discussed in this review demonstrate that pemetrexed is well tolerated as a single agent and will be an important contribution to combination chemotherapy regimens.

Antineoplastic Combined Chemotherapy Protocols↗

A phase IB study of the pharmacokinetics of gemcitabine and pemetrexed, when administered in rapid sequence to patients with advanced solid tumors.

BACKGROUND: We have previously demonstrated that pemetrexed is clinically active when administered 90 min after gemcitabine in a phase I study. The present study was undertaken to evaluate the efficacy, toxicity, and pharmacokinetics of gemcitabine and pemetrexed when pemetrexed is administered immediately after gemcitabine. PATIENTS AND METHODS: A total of 14 patients received 84 cycles of treatment. Gemcitabine 1250 mg/m(2) was administered on days 1 and 8 of each 21-day cycle, and pemetrexed 500 mg/m(2) on day 8 immediately following gemcitabine administration. Toxicities were graded according to the National Cancer Institute Common Toxicity Criteria and recorded as maximum grade per patient for all treatment cycles. Pharmacokinetic analyses of plasma gemcitabine and pemetrexed concentrations were performed. RESULTS: Neutropenia was the most common severe toxicity. Non-hematologic toxicities, which included nausea, vomiting, fatigue, diarrhea, rash, and elevated transaminases were of mild-to-moderate severity. No increased toxicity was observed with this schedule in comparison to the previous phase I schedule. There was no pharmacokinetic interaction between the two drugs. One partial response was documented in a patient with non-small-cell lung cancer. Eight patients had disease stabilization for five or more cycles. CONCLUSION: Gemcitabine immediately followed by pemetrexed is well tolerated and clinically active, and deserves further evaluation in phase II trials.

Adult↗

Radiation recall dermatitis with pemetrexed.

Pemetrexed has recently been approved for use in combination with cisplatin as first-line chemotherapy for malignant pleural mesothelioma (MPM). Radiation therapy is frequently administered to the thoracic orifices and no data are available about the interactions between radiotherapy and pemetrexed. We report the first case of radiation recall dermatitis occurring after pemetrexed chemotherapy in a patient with MPM previously treated with radiation therapy to the thoracoscopy and drainage orifices. The patient received chemotherapy with pemetrexed and cisplatin 19 days after completion of chest wall radiation therapy delivering 21 gray in 3 days. Conventional premedication by folic acid and intramuscular administration of Vitamin B12 and prednisolone was correctly performed. Twelve days later, confluent erythematous and pruritus rash of the irradiated skin was observed. The toxicity grade of this lesion was evaluated at 2 according to the Acute Radiation Morbidity Scoring Criteria proposed by the Radiation Therapy Oncology Group. Pemetrexed challenge was performed without worsening of skin lesions. Three weeks later, skin cicatrisation was observed after a desquamative phase. Persistent hyperpigmentation was seen in the irradiated skin. Pemetrexed could also act as a radiosensitizing agent that should be used with care for several weeks after radiotherapy.

Aged↗

Induction of resistance to the multitargeted antifolate Pemetrexed (ALIMTA) in WiDr human colon cancer cells is associated with thymidylate synthase overexpression.

Pemetrexed (ALIMTA, MTA) is a novel thymidylate synthase (TS) inhibitor and has shown activity against colon cancer, mesothelioma and nonsmall-cell lung cancer. We induced resistance to Pemetrexed in the human colon cancer cell line WiDr by using a continuous exposure to stepwise increasing Pemetrexed concentrations (up to 20 microM) as well as a more clinically relevant schedule with intermittent exposure (up to 50 microM) for 4 hr every 7 days, resulting in WiDr variants WiDr-cPEM and WiDr-4PEM, respectively. However, using the same conditions, it was not possible to induce resistance in the WiDr/F cell line, a variant adapted to growth under low folate conditions. Mechanisms of resistance to Pemetrexed were determined at the level of TS, folylpolyglutamate synthetase (FPGS) and reduced folate carrier (RFC). WiDr-4PEM and WiDr-cPEM showed cross-resistance to the polyglutamatable TS inhibitor Raltitrexed (6- and 19-fold, respectively) and the nonpolyglutamatable TS-inhibitor Thymitaq (6- and 42-fold, respectively) but not to 5-fluorouracil. The ratios of TS mRNA:beta actin mRNA in WiDr-4PEM and WiDr-cPEM were 5-fold (P=0.01) and 18-fold (P=0.04) higher, respectively, compared to WiDr (ratio: 0.012). In addition, TS protein expression in the resistant WiDr variants was elevated 3-fold compared to WiDr, while the catalytic activity of TS with 1 microM dUMP increased from 30 pmol/hr/10(6) cells in WiDr cells to 2201 and 7663 pmol/hr/10(6) cells in WiDr-4PEM and WiDr-cPEM, respectively. The activity of FPGS was moderately decreased, but not significantly different in all WiDr variants. Finally, no evidence was found that decreased catalytic activity of RFC was responsible for the obtained Pemetrexed resistance. Altogether, these results indicate that resistance to Pemetrexed in the colon cancer cell line WiDr was solely due to upregulation of TS of which all related parameters (mRNA and protein expression and TS activity) were increased, rather than alterations in FPGS or RFC activity.

Antimetabolites, Antineoplastic↗

Pemetrexed disodium, a novel antifolate with multiple targets.

Pemetrexed disodium is a potent new antifolate which inhibits many folate-dependent reactions that are essential for cell proliferation. Its primary target is thymidylate synthase but it also inhibits folate-dependent enzymes involved in purine synthesis. Cells that are resistant to antifolates are generally less resistant to pemetrexed, irrespective of the mechanism of resistance. Pemetrexed has shown good activity in preclinical models with human tumour cells and xenografts. In the majority of clinical trials of pemetrexed, the dose-limiting toxic effect is neutropenia; other side-effects are mostly gastrointestinal. Preclinical studies indicate that the toxic effects of pemetrexed can be reduced by dietary folate, resulting in an improved therapeutic index. Low folate status is also associated with higher levels of toxicity in patients. As a single agent pemetrexed has shown good activity against non-small-cell lung cancer, squamous-cell carcinoma of head and neck, colon cancer, and breast cancer, and it appears to be particularly active in combination with cisplatin against non-small-cell lung cancer and mesothelioma. Phase II and III studies are underway.

Antineoplastic Agents↗

A phase I study of pemetrexed (LY231514) supplemented with folate and vitamin B12 in Japanese patients with solid tumours.

The purpose of this study was to determine the maximum tolerated dose (MTD) and recommended dose (RD) of pemetrexed with folate and vitamin B12 supplementation (FA/VB(12)) in Japanese patients with solid tumours and to investigate the safety, efficacy, and pharmacokinetics of pemetrexed. Eligible patients had incurable solid tumours by standard treatments, a performance status 0-2, and adequate organ function. Pemetrexed from 300 to 1,200 mg m(-2) was administered as a 10-min infusion on day 1 of a 21-day cycle with FA/VB(12). Totally, 31 patients were treated. Dose-limiting toxicities were alanine aminotransferase (ALT) elevation at 700 mg m(-2), and infection and skin rash at 1,200 mg m(-2). The MTD/RD were determined to be 1,200/1,000 mg m(-2), respectively. The most common grade 3/4 toxicities were neutropenia (grade (G) 3:29, G4:3%), leucopenia (G3:13, G4:3%), lympopenia (G3:13%) and ALT elevation (G3:13%). Pemetrexed pharmacokinetics in Japanese were not overtly different from those in western patients. Partial response was achieved for 5/23 evaluable patients (four with non-small cell lung cancer (NSCLC) and one with thymoma). The MTD/RD of pemetrexed were determined to be 1,200/1,000 mg m(-2), respectively, that is, a higher RD than without FA/VB(12) (500 mg m(-2)). Pemetrexed with FA/VB(12) showed a tolerable toxicity profile and potent antitumour activity against NSCLC in this study.

Adult↗

Pemetrexed for treatment of advanced non-small cell lung cancer.

The novel antifolate pemetrexed targets multiple enzymes involved in folate metabolism, resulting in inhibition of DNA synthesis. Pemetrexed has shown antitumor activity in preclinical models against a variety of tumor types, including non-small cell lung cancer. Phase II studies have confirmed its single-agent activity and manageable toxicity profile, and pemetrexed has shown antitumor activity in combination with other chemotherapeutics, including gemcitabine, taxanes, platinums, and vinorelbine, in the first-line treatment of advanced non-small cell lung cancer. A large ongoing phase III trial is comparing the activity of pemetrexed versus docetaxel in the second-line setting. Supplementation with oral folic acid and vitamin B12 was shown to reduce pemetrexed-related toxicity and increase its therapeutic index. These data suggest that pemetrexed has significant activity in advanced non-small cell lung cancer and represents a new treatment option for patients with this disease.

Antimetabolites, Antineoplastic↗

Clinical Experience With Pemetrexed in Breast Cancer.

Alimta (pemetrexed) is a novel multitargeted antifolate that inhibits several enzymes in the de novo pathways of pyrimidine and purine biosynthesis, including thymidylate synthase, dihydrofolate reductase, and glycinamide ribonucleotide formyltransferase. Pemetrexed possesses antitumor activity in several solid tumors, including non-small cell lung cancer, malignant pleural mesothelioma, pancreas, colorectal, gastric, bladder, breast, and head and neck cancers. The main toxicities of the drug are myelosuppression, skin rash, and mucositis. Both myelosuppression and mucositis are more frequent in patients with high homocysteine plasma levels (an indicator of deficient vitamin B12 and folate pools). Supplementation with vitamin B12 and folic acid greatly reduces most severe toxicities and has been implemented in pemetrexed trials since December 1999. Pemetrexed has been tested in five phase II trials in locally advanced or metastatic breast cancer. The drug has shown an activity of around 30% in advanced breast cancer patients with minimal or no prior chemotherapy. In patients who received prior anthracyclines, response rates of 21% were reported. Responses have also been observed in a moderate proportion of patients who had been pretreated with anthracyclines, taxanes, and capecitabine. Some studies have suggested that a correlation exists between thymidylate synthase tumor expression with pemetrexed antitumor activity; this attractive hypothesis should be confirmed in further studies. The optimal dose when combined with vitamin supplementation is under current investigation in patients with breast cancer. A randomized phase II study comparing pemetrexed 600 and 900 mg/m2 with vitamin supplementation as first-line treatment for metastatic breast cancer is ongoing.

Antineoplastic Agents↗

Use of pemetrexed in breast cancer.

Pemetrexed, a new antifolate drug, has shown broad-spectrum activity in multiple tumor types. Single-agent activity against breast cancer in untreated patients reached 31% and, depending on the type and degree of prior chemotherapy, response rates tended to decrease stepwise from 28% in lightly pretreated patients (ie, with only adjuvant chemotherapy or at maximum one chemotherapy treatment for metastatic disease) to 8% in heavily pretreated patients after exposure with anthracyclines, taxanes, and capecitabine. No clear dose-response relationship could be established. The results from an ongoing prospective, randomized, double-blind phase II study of two different doses (600 mg/m(2) and 900 mg/m(2) of single-agent pemetrexed) may elucidate this further. In addition, analysis of specific gene profiles and clinical outcome with special emphasis on pathways known to be important for antifolate activity is ongoing. Combinations of pemetrexed with doxorubicin, epirubicin, or cyclophosphamide have also been evaluated in separate phase I/II trials. For the combination of pemetrexed with carboplatin or gemcitabine, dose recommendations from phase I trials that are not restricted to breast cancer have been used. The combination of pemetrexed with gemcitabine or carboplatin has shown remarkable activity. Further results on the use of a pemetrexed-plus-cyclophosphamide combination will be provided by an ongoing prospective, randomized phase II study.

Antimetabolites, Antineoplastic↗

Pemetrexed in the treatment of non-small cell lung cancer.

A large meta-analysis showed that chemotherapy results in significant prolongation of survival for patients with non-small cell lung cancer (NSCLC). Pemetrexed is a new multitargeted antifolate chemotherapeutic agent that has shown activity in NSCLC and appears to be similar to the third-generation antitumor agents currently in use today. In two phase I trials of pemetrexed in previously untreated patients with NSCLC, overall response rates of 16% and 23% were seen. The treatment was very well tolerated, particularly when dexamethasone premedication was used to prevent rash. In two phase II trials of pemetrexed and cisplatin, overall response rates rose to 39% and 45% with 1-year survival rates of 49% and 50%. Furthermore, in one of the trials, the response rate for stage IV patients was 45%. In the second-line treatment of NSCLC, 9% of patients responded to pemetrexed. The response rate in patients who had not previously received a cisplatin regimen was 14%, and 5% for patients previously treated with a platinum compound. A large randomized trial that compares treatment with pemetrexed to docetaxel in the second-line setting for NSCLC has recently completed accrual. In conclusion, pemetrexed is an active agent in the treatment of advanced NSCLC and represents a new option for the treatment of patients with this malignancy.

Antimetabolites, Antineoplastic↗

Pemetrexed: an active new agent for breast cancer.

Pemetrexed is a novel antifolate that inhibits three enzymes in the de novo purine and pyrimidine pathways including thymidylate synthase, dihydrofolate reductase, and glycinamide ribonucleotide formyltransferase. It becomes highly polyglutamated once inside cancer cells, resulting in prolonged intracellular retention and 60-fold greater inhibition of thymidylate synthase than the monoglutamated form. Several phase II and III studies have shown that pemetrexed has significant antitumor activity against a variety of tumor types including mesothelioma, non-small cell lung cancer, and colon, pancreatic, and breast cancers. Pemetrexed appears to provide non-cross-resistant cytotoxic activity against breast cancers that have been treated with anthracyclines, taxanes, and capecitabine. Preclinical studies have suggested that pemetrexed enhances the cytotoxicity of several other important chemotherapeutic agents active against breast cancer including doxorubicin, paclitaxel, cisplatin, and gemcitabine. In vitro studies have shown that pemetrexed treatment synchronizes cancer cells at the G(2)/S interphase, leading to synchronous entry into S phase. Ongoing phase II studies of pemetrexed combinations in breast cancer hope to exploit the cell cycle modulatory effects of this drug as well as its excellent tolerability.

Antimetabolites, Antineoplastic↗

Alteration of pemetrexed excretion in the presence of acute renal failure and effusions: presentation of a case and review of the literature.

Pemetrexed is a multitargeted antifolate approved by the Food and Drug Administration for patients with mesothelioma and non small cell lung cancer. As this agent is almost exclusively cleared by renal excretion, trials leading to its approval were conducted in patients with normal renal function. However, this cycle active agent often is administered with cisplatin to patients who may have pleural effusions and ascites. As a result, the potential for drug accumulation in effusions and for accompanying renal insufficiency is real. Recommendations for the management of pemetrexed toxicity in the presence of renal failure have not been established. A case of treatment-related acute renal failure following chemotherapy with cisplatin and pemetrexed in a patient with advanced mesothelioma and ascites is presented. Pharmacologic studies in this patient revealed persistent pemetrexed levels in ascites and plasma. This is the first time that significant accumulation of pemetrexed in ascetic fluid has been reported in the literature. Treatment with leucovorin, folate, and continuous veno-venous hemodialysis was initiated. Thymidine and carboxypeptidase were not available. Dialysis was unsuccessful in removing pemetrexed. Theoretical and practical approaches to management of similar cases are presented.

Acute Kidney Injury↗

Phase I and pharmacokinetic study of the multitargeted antifolate pemetrexed in combination with oxaliplatin in patients with advanced solid tumors.

BACKGROUND: This phase I and pharmacokinetic study of pemetrexed in combination with oxaliplatin was performed to determine the maximum tolerated dose (MTD), and to evaluate safety and pharmacokinetics in patients with metastatic solid tumors. PATIENTS AND METHODS: Pemetrexed was administered as a 10- min i.v. infusion followed 30 min later by oxaliplatin as a 2- h infusion, once every 21 days. Up to two previous chemotherapy regimens were allowed. Vitamin B(12) supplementation and folic acid were not included in this study. RESULTS: Thirty-six patients were treated in six escalating dose levels. Dose-limiting toxicities at dose level 6 (pemetrexed 500 mg/m(2) plus oxaliplatin 130 mg/m(2)) were febrile neutropenia, grade 3-4 diarrhea and grade 3 paresthesia. The MTD was not reached. The most common toxicity was neutropenia, with grade 3-4 occurring in 61% of patients. The pharmacokinetics of this pemetrexed-oxaliplatin combination are consistent with those following single-agent administration. Five responses (all partial) were observed over a broad range of solid tumors. CONCLUSIONS: This pemetrexed-oxaliplatin combination (without vitamin supplementation) every 21 days can be administered using full therapeutic doses of each agent with acceptable tolerability and no overlapping toxicity. The recommended regimen for phase II studies is pemetrexed 500 mg/m(2) plus oxaliplatin 120 mg/m(2).

Adenocarcinoma↗

Phase I clinical and pharmacokinetic study of pemetrexed and carboplatin in patients with malignant pleural mesothelioma.

PURPOSE: To determine the maximum tolerated dose (MTD) of pemetrexed and carboplatin given in combination, to derive a recommended dose for phase II studies, and to explore its efficacy. We assessed toxicities and explored the activity of the drug combination exclusively in patients with malignant pleural mesothelioma (MPM). The pharmacokinetics of both agents was investigated. PATIENTS AND METHODS: Twenty-seven patients (23 male, four female) with MPM were treated on five escalating dose levels. Doses ranged from pemetrexed 400 mg/m(2) (as a 10-minute intravenous infusion), followed by carboplatin area under the plasma concentration-time curve (AUC) 4 mg/mL.min (as a 30-minute intravenous infusion) to pemetrexed 500 mg/m(2), carboplatin AUC 6 mg/mL.min. All patients had a World Health Organization performance status of 1. A total of 163 courses of treatment were administered (median, six; range, one to 10). RESULTS: The main toxicity was hematologic, particularly neutropenia, although this was characteristically short-lived and caused few clinical problems. The MTD was pemetrexed 500 mg/m(2), carboplatin AUC 6, because three of the five patients treated at this dose level experienced a dose-limiting toxicity. Eight partial responses (in 25 assessable patients) were observed for a response rate of 32%. Seventy percent of patients noticed an improvement in symptoms, usually (84%) after only two courses. Median time to progression was 305 days, and median survival time was 451 days. CONCLUSION: The MTD was pemetrexed 500 mg/m(2) and carboplatin AUC 6 mg/mL.min. The recommended phase II dose of the combination is pemetrexed 500 mg/m(2) and carboplatin AUC 5 mg/mL.min. The combination is both active and well tolerated in MPM and deserves further exploration.

Adult↗