An open-label, single-arm, phase II trial of buparlisib in patients with melanoma brain metastases not eligible for surgery or radiosurgery-the BUMPER study

Background

Patients with melanoma brain metastasis (MBM) still carry a dismal prognosis. Preclinical data originated in xenograft models showed that buparlisib therapy was highly effective in therapy-naïve MBM.

Patients and Methods

In this open-label, phase II trial, we investigate the safety and efficacy of monotherapy with buparlisib, a PI3K inhibitor, in patients with asymptomatic MBM who were not candidates for local therapy. These patients had also progressed under immunotherapy if BRAF wild-type or under targeted therapy with BRAF/MEK inhibitors if carrying a BRAFV600E/K mutation. The primary endpoint was the intracranial disease control rate assessed by the investigators. The secondary endpoints were overall response rate, duration of response (DOR) of intracranial disease, overall response, progression-free survival (PFS), overall survival (OS), safety, and tolerability of buparlisib.

Results

A total of 20 patients were screened and 17 patients were treated with buparlisib. Twelve patients had progressed under more than 2 systemic therapy lines and 17 had received at least 1 previous local therapy. There were no intracranial responses. Three patients achieved intracranial stable disease; the median DOR was 117 days. The median PFS was 42 days (95% confidence interval [CI]: 23–61 days) and the median OS was 5.0 months (95% CI: 2.24–7.76 months). No new safety signs were observed.

Conclusions

Buparlisib was well tolerated but no intracranial responses were observed. These results might be explained in part by the inclusion of only heavily pretreated patients. However, preclinical data strongly support the rationale to explore PI3K inhibitor-based combinations in patients with MBM displaying hyperactivation of the PI3K–AKT pathway.

Das basaloide follikuläre Hamartom – eine seltene Differenzialdiagnose des Basalzellkarzinoms

Das basaloide follikuläre Hamartom nimmt unter den seltenen Differenzialdiagnosen des Basalzellkarzinoms eine wichtige Stellung ein. Es gilt die primär benigne Fehlbildung des Haarfollikels als solche zu identifizieren, um den Patienten vor unnötigen Operationen zu schützen. Wir berichten über eine 60-jährige Patientin, welche sich zur Einholung einer Zweitmeinung nach mehrfachen Voroperationen aufgrund einer vermeintlichen R1-Situation eines Basalzellkarzinoms vorstellte. In der klinischen Untersuchung fielen zahlreiche hautfarbene Papeln zentrofazial auf. In Zusammenschau von klinischem Untersuchungsbefund und Histologie konnte die Diagnose eines basaloiden follikulären Hamartoms gestellt werden. Anhand des Falles wird die Bedeutung des klinischen Untersuchungsbefundes für die Erhebung der histologischen Diagnose durch den Pathologen ersichtlich. Insbesondere bei komplexen Verläufen sollte eine Reevaluation der Diagnose erfolgen. Hierbei übt der Operateur eine entscheidende Position aus, indem er den histologischen Befund in den klinischen Kontext einfügt.

Impact of radiation, systemic therapy and treatment sequencing on survival of patients with melanoma brain metastases

BACKGROUND

Combining stereotactic radiosurgery (SRS) and active systemic therapies (STs) achieved favourable survival outcomes in patients with melanoma brain metastases (MBMs) in retrospective analyses. However, several aspects of this treatment strategy remain poorly understood. We report on the overall survival (OS) of patients with MBM treated with a combination of radiotherapy (RT) and ST as well as the impact of the v-Raf murine sarcoma viral oncogene homolog B (BRAF)-V600 mutation (BRAFmut) status, types of RT and ST and their sequence.

PATIENTS AND METHODS

Data of 208 patients treated with SRS or whole brain radiation therapy (WBRT) and either immunotherapy (IT) or targeted therapy (TT) within a 6-week interval to RT were analysed retrospectively. OS was calculated from RT to death or last follow-up. Univariate and multivariate Cox proportional hazard analyses were performed to determine prognostic features associated with OS.

RESULTS

The median follow-up was 7.3 months. 139 patients received IT, 67 received TT and 2 received IT and TT within 6 weeks to RT (WBRT 45%; SRS 55%). One-year Kaplan-Meier OS rates were 69%, 65%, 33% and 18% (P < .001) for SRS with IT, SRS with TT, WBRT with IT and WBRT with TT, respectively. Patients with a BRAFmut receiving IT combined with RT experienced higher OS rates (88%, 65%, 50% and 18%). TT following RT or started before and continued thereafter was associated with improved median OS compared with TT solely before RT (12.2 [95% confidence interval {CI} 9.3-15.1]; 9.8 [95% CI 6.9-12.6] versus 5.1 [95% CI 2.7-7.5]; P = .03).

CONCLUSION

SRS and IT achieved the highest OS rates. A BRAFmut appears to be a favourable prognostic factor for OS. For the combination of RT and TT, the sequence appears to be crucial. Combinations of WBRT and ST achieved unprecedentedly high OS rates and warrant further studies.

Sequence-dependent cross-resistance of combined radiotherapy plus BRAFV600E inhibition in melanoma

INTRODUCTION

Treatment of patients with metastatic melanoma is hampered by drug-resistance and often requires combination with radiotherapy as last-resort option. However, also after radiotherapy, clinical relapses are common.

METHODS & RESULTS

Our preclinical models indicated a higher rate of tumour relapse when melanoma cells were first treated with BRAF^V600E inhibition (BRAFi) followed by radiotherapy as compared to the reverse sequence. Accordingly, retrospective follow-up data from 65 stage-IV melanoma patients with irradiated melanoma brain metastases confirmed a shortened duration of local response of mitogen-activated protein kinase (MAPK)-inhibitor-pretreated compared with MAPK-inhibitor-naïve intracranial metastases. On the molecular level, we identified JARID1B/KDM5B as a cellular marker for cross-resistance between BRAFi and radiotherapy. JARID1B^high cells appeared more frequently under upfront BRAFi as compared with upfront radiation. JARID1B favours cell survival by transcriptional regulation of genes controlling cell cycle, DNA repair and cell death.

CONCLUSION

The level of cross-resistance between combined MAPK inhibition and radiotherapy is dependent on the treatment sequence. JARID1B may represent a novel therapy-overarching resistance marker.

Information-seeking and use of information resources among melanoma patients of German skin cancer centers

BACKGROUND

This study aimed to explore the information-seeking behavior (ISB) of melanoma patients (MPs) and MP subgroups, in order to provide data for needs-based adaptation of information provision.

METHODS

In a cross-sectional survey in 27 German skin cancer centers, we explored characteristics of the ISB of MPs with the aid of a standardized questionnaire. Sub-group differences were determined with the chi-squared test and predictors of media preferences with logistic regression.

RESULTS

67 % of the 529 participating MPs had clinical stage III or IV melanoma. Most of the participants (81 %) reported medical consultations as their regularly or frequently used information resource (IR). 58 % wished to have more advice about IRs from their physician. Only 8 % of MPs used the services of self-help groups and 12 % of MPs took advantage of the services of cancer counseling centers. The internet (63 %) and booklets (58 %) were reported to be the preferred media. Age, educational level, general need for information and lack of awareness of their own condition proved to be predictors for media preferences.

CONCLUSIONS

Most MPs expected their physician to advise them about IRs they could use in addition to medical consultations. Peer support services were quite underused by MPs. The various preferences of media by MPs should be considered when deve-loping and providing IRs.

Melanoma Brain Metastases: Local Therapies, Targeted Therapies, Immune Checkpoint Inhibitors and Their Combinations-Chances and Challenges

Recent phase II trials have shown that BRAF/MEK inhibitors and immune checkpoint inhibitors are active in patients with melanoma brain metastases (MBM), reporting intracranial disease control rates of 50-75%. Furthermore, retrospective analyses suggest that combining stereotactic radiosurgery with immune checkpoint inhibitors or BRAF/MEK inhibitors prolongs overall survival. These data stress the need for inter- and multidisciplinary cooperation that takes into account the individual prognostic factors in order to establish the best treatment for each patient. Although the management of MBM has dramatically improved, a substantial number of patients still progress and die from brain metastases. Therefore, there is an urgent need for prospective studies in patients with MBM that focus on treatment combinations and sequences, new treatment strategies, and biomarkers of treatment response. Moreover, further research is needed to decipher brain-specific mechanisms of therapy resistance.

PD-1-Blockade bei einem HIV-Patienten mit metastasiertem Merkelzellkarzinom

Aufgrund der modernen antiretroviralen Therapie (ART) haben HIV-positive Patienten eine kaum eingeschränkte Lebenserwartung. Die Folge ist eine Zunahme nicht HIV-assoziierter Krebserkrankungen unter den Infizierten. Die Wirkungen und Nebenwirkungen der neuen Checkpoint-Inhibitoren, z. B. Anti-PD-1-Antikörper (PD1 AK) im Zusammenhang mit einem gestörten Immunsystem bei HIV-Infektion sind bisher nicht hinreichend untersucht.

In der vorgestellten Kasuistik wurde ein Patient mit metastasiertem Merkelzellkarzinom und einer neu diagnostizierten HIV-Infektion mittels einer antiretroviralen Therapie und Pembrolizumab therapiert. Unter der Therapie mit dem Anti-PD-1-Antikörper und der ART zeigten sich eine komplette Remission nach 6 Monaten und eine rasche Besserung des Immunstatus.

Die Therapie eines HIV-infizierten Patienten mit PD-1-Antikörpern scheint wirksam und verträglich zu sein und hat offenbar keinen negativen Effekt auf den Verlauf der HIV-Infektion. Somit stellen Anti-PD-1-Antikörper eine Therapieoption für HIV-positive Patienten mit metastasiertem Merkelzellkarzinom dar.

Clinical outcome of concomitant vs interrupted BRAF inhibitor therapy during radiotherapy in melanoma patients

Background:

Concomitant radiation with BRAF inhibitor (BRAFi) therapy may increase radiation-induced side effects but also potentially improve tumour control in melanoma patients.

Methods:

A total of 155 patients with BRAF-mutated melanoma from 17 European skin cancer centres were retrospectively analysed. Out of these, 87 patients received concomitant radiotherapy and BRAFi (59 vemurafenib, 28 dabrafenib), while in 68 patients BRAFi therapy was interrupted during radiation (51 vemurafenib, 17 dabrafenib). Overall survival was calculated from the first radiation (OS_RT) and from start of BRAFi therapy (OS_BRAFi).

Results:

The median duration of BRAFi treatment interruption prior to radiotherapy was 4 days and lasted for 17 days. Median OS_RT and OS_BRAFi in the entire cohort were 9.8 and 12.6 months in the interrupted group and 7.3 and 11.5 months in the concomitant group (P=0.075/P=0.217), respectively. Interrupted vemurafenib treatment with a median OS_RT and OS_BRAFi of 10.1 and 13.1 months, respectively, was superior to concomitant vemurafenib treatment with a median OS_RT and OS_BRAFi of 6.6 and 10.9 months (P=0.004/P=0.067). Interrupted dabrafenib treatment with a median OS_RT and OS_BRAFi of 7.7 and 9.8 months, respectively, did not differ from concomitant dabrafenib treatment with a median OS_RT and OS_BRAFi of 9.9 and 11.6 months (P=0.132/P=0.404). Median local control of the irradiated area did not differ in the interrupted and concomitant BRAFi treatment groups (P=0.619). Skin toxicity of grade ≥2 (CTCAE) was significantly increased in patients with concomitant vemurafenib compared to the group with treatment interruption (P=0.002).

Conclusions:

Interruption of vemurafenib treatment during radiation was associated with better survival and less toxicity compared to concomitant treatment. Due to lower number of patients, the relevance of treatment interruption in dabrafenib treated patients should be further investigated. The results of this analysis indicate that treatment with the BRAFi vemurafenib should be interrupted during radiotherapy. Prospective studies are desperately needed.

An open-label, uncontrolled, single arm phase II trial of the PI3K inhibitor buparlisib in patients with melanoma brain metastases

TPS9595

Background: The approval of effective BRAF +/- MEK inhibitors and immune checkpoint inhibitors has revolutionized the treatment of metastatic melanoma. However, available therapies appear to be less effective on cerebral than extracerebral metastases. Hyperactivation of the PI3K-AKT survival pathway is a prominent feature of melanoma brain metastases (MBM). This trial aims to determine the activity and safety of the PI3K inhibitor buparlisib in patients (pts) with MBM. Methods: The study enrolls adults suffering from MBM not eligible for neurosurgery or/and radiosurgery. Patients must have failed prior treatment with BRAF +/- MEK Inhibitors (BRAF-V600E mutated population) and anti-PD-1 or/and anti-CTLA-4 antibodies (BRAF wild-type population), respectively. Patients are treated with buparlisib 100 mg PO daily until disease progression or unacceptable toxicity. The Simon-Two-Step design for phase 2 studies was used to determine sample size. Assuming a response rate of 12.5% in comparison to historical 10% for chemotherapy 22 (8/14) pts would be required. If there are one or fewer responses in the first 8 pts the study would stop. Prespecified activity goal for the first stage of accrual was met; currently 11/22 pts are enrolled. Clinical trial information: NCT02452294.

Systemic therapy of metastatic melanoma

For patients with metastatic melanoma, there are currently several effective therapeutic options. The BRAF inhibitors vemurafenib and dabrafenib are characterized by rapid tumor control and high response rates. In combination with one of the two MEK inhibitors trametinib and cobimetinib, they achieve response rates (CR + PR, complete plus partial remissions) of 70%, while delaying the development of treatment resistance, as well as a median overall survival of > 2 years with tolerable side effects. Showing long-term survival rates of approximately 20%, the anti-CTLA-4 antibody ipilimumab is the first substance that has led to a significant prolongation of overall survival in patients with metastatic melanoma. However, delayed treatment response and severe immune-mediated side effects may pose limitations to its therapeutic benefit. Usually well tolerated, anti-PD-1 antibody monotherapy using nivolumab and pembrolizumab has yielded response rates (CR + PR) of up to 45% and one-year survival rates of > 70%. The combination of ipilimumab and nivolumab has shown response rates of up to 58% and a median progression-free survival of > 11 months. While this combination is expected to result in a rapid and long-lasting response, this potential benefit comes at the expense of a high level of toxicity. Strategies for treatment sequencing and treatment combinations are currently being investigated in clinical studies. Overall, the prognosis for patients with metastatic melanoma has significantly improved. With long-term survival a possibility, not only acute but also long-term therapeutic side effects must be taken into account.