Anti-PD-1 antibody monotherapy versus anti-PD-1 plus anti-CTLA-4 combination therapy as first-line immunotherapy in unresectable or metastatic mucosal melanoma: a retrospective, multicenter study of 329 Japanese cases (JMAC study)

Oral Melanoma in Older Adults: Epidemiology, Molecular Landscape, and Treatment Strategies

Oral melanoma is an aggressive neoplasm arising from melanocytes in the mucosal epithelium, accounting for 0.2%-0.8% of all melanomas. Unlike cutaneous melanoma, it is not associated with UV exposure, and its pathogenesis involves complex genetic and molecular alterations. This neoplasm predominantly affects older adults (≥ 60 years). Clinically, lesions often present as macular or nodular with an exophytic growth pattern, sometimes ulcerated, and exhibit varied pigmentation. Diagnosis is further complicated by non-pigmented (amelanotic) variants that can resemble other oral pigmentations. Wide surgical excision remains the mainstay treatment, often combined with chemotherapy; however, recurrence and distant metastasis remain high. While immunotherapy has shown promise in other melanoma subtypes, its efficacy in oral melanoma remains uncertain. Treatment in older adults is particularly challenging due to comorbidities and treatment-related morbidity. This review summarizes the epidemiology, clinical features, and current treatment strategies for oral melanoma in older adults. Key advances in the molecular mechanisms underlying this neoplasm are also outlined. As a strategic approach, integrating oral melanoma screening into routine geriatric dental care, supported by diagnostic algorithms, may improve early detection, prognosis, and survival outcomes in this vulnerable population.

Genomic profiling and personalized treatment strategies for skin malignancies: findings from the center for cancer genomics and advanced therapeutics database

Immune checkpoint inhibitors and molecular-targeted therapies have dominated recent cancer treatment. However, these treatments face challenges, such as primary and acquired resistance, indicating that not all patients benefit from them. Therefore, the search for new molecular targets is crucial. In addition, immune checkpoint inhibitors have exhibited racial differences in their effectiveness for certain neoplasms. Hence, understanding the genomic landscape of cancers in various racial groups is important. In Japan, health insurance has covered comprehensive genomic profiling since 2019, and the Center for Cancer Genomics and Advanced Therapeutics (C-CAT) has accumulated genetic abnormalities along with clinical data of patients with various cancers. These data are crucial for advancing cancer research and drug development. This review discusses the genetic abnormalities of the major skin malignancies including melanoma, cutaneous squamous cell carcinoma (cSCC), and extramammary Paget's disease (EMPD), and proposes potential treatment strategies by comparing C-CAT data analysis with other genetic studies. The C-CAT data have emphasized unique genetic alterations in tumors of the Japanese population, particularly racial differences in tumor mutational burden in cutaneous melanoma and cSCC, indicating the importance of personalized treatment strategies that consider racial differences.

Pulmonary metastases from malignant melanoma showing ground-glass opacity nodules

PURPOSE

To investigate the frequency and characteristics of pulmonary metastases from malignant melanoma presenting as ground-glass opacity nodules (GGNs) on chest computed tomography (CT).

MATERIAL AND METHODS

A total of 354 patients with malignant melanoma who underwent chest CT for staging or follow-up were selected. We reviewed the CT images and enrolled 87 patients with lung metastases. Two radiologists evaluated the nodularity of the lung metastases (solid nodules or GGNs). Additionally, the tumor doubling time and disease type (mucosal, cutaneous, or acral melanomas) were analyzed.

RESULTS

GGNs were observed in 13 of 87 (14.9%) patients. The tumor doubling time was 52.0 ± 33.5 days (range: 10.9-111 days) for GGNs and 43.8 ± 27.5 days (range: 9.4-115.3 days) for solid nodules. GGNs changed to solid nodules in 54.5% of patients with increased GGN metastasis. More patients in the GGN group (patients whose metastases included GGNs) had mucosal melanomas than acral melanomas (p = 0.0478); however, no significant difference was observed in the frequency of mucosal and cutaneous melanomas (p = 0.0670). Similarly, the proportion of patients in the GGN-dominant pattern group (patients with GGNs only or more GGNs than solid nodules) who had mucosal melanomas was more than that of patients with acral and cutaneous melanomas (mucosal melanoma vs. acral melanoma, p = 0.0342; mucosal melanoma vs. cutaneous melanoma, p = 0.0344).

CONCLUSIONS

Lung metastases from malignant melanoma sometimes appear as GGNs on CT, with a frequency of 14.9% in this study. If lung metastasis is observed as a GGN, the tumor doubling time may be useful for differentiating lung metastasis of malignant melanoma from lung adenocarcinoma.

Genomic landscape of cutaneous, acral, mucosal, and uveal melanoma in Japan: analysis of clinical comprehensive genomic profiling data

BACKGROUND

Cutaneous melanoma (CM) is the most common type in Caucasians, while acral melanoma (AM) and mucosal melanoma (MM), which are resistant to immunotherapies and BRAF/MEK-targeted therapies, are more common in East Asians. Genomic profiling is essential for treating melanomas, but such data are lacking in Japan.

METHODS

Comprehensive genomic profiling data compiled in the Center for Cancer Genomics and Advanced Therapeutics (C-CAT) were analyzed.

RESULTS

A total of 380 melanomas was analyzed, including 136 CM, 46 AM, 168 MM, and 30 uveal melanoma (UM). MM included conjunctival, sinonasal, oral, esophageal, anorectal, and vulvovaginal melanomas. No significant difference in the median tumor mutational burden (TMB) of CM (3.39 mutations/megabase), AM (2.76), and MM (3.78) was the key finding. Microsatellite instability-high status was found in one case. BRAF V600E/K was found in only 45 patients (12%). Key driver mutations in CM were BRAF (38%), NRAS (21%), NF1 (8%), and KIT (10%), with frequent copy number alterations (CNAs) of CDKN2A, CDKN2B, and MYC. AM was characterized by altered KIT (30%), NRAS (26%), and NF1 (11%) and CDKN2A, CDKN2B, CDK4, MDM2, and CCND1 CNAs. MM was characterized by altered NRAS (24%), KIT (21%), and NF1 (17%) and MYC, KIT, and CDKN2A CNAs, with differences based on anatomical locations. UM bore GNAQ or GNA11 driver mutations (87%) and frequent mutations in SF3B1 or BAP1.

CONCLUSION

The distinct genomic profiling in Japanese patients, including lower TMB, compared to Caucasians, is associated with poorer treatment outcomes. This result underscores the need for more effective therapeutic agents.

Effectiveness of immune checkpoint inhibitors and other treatment modalities in patients with advanced mucosal melanomas: a systematic review and individual patient data meta-analysis

Background

Mucosal melanomas (MM) are an aggressive subtype of melanoma. Given the rarity of this disease, the conduct of clinical trials is challenging and has been limited. Current treatment options have been extrapolated from the more common cutaneous melanoma even though MM is distinct in pathogenesis, etiology and prognosis. This is the first meta-analysis to comprehensively assess the efficacy of immune checkpoint inhibitors (anti-PD1 and anti-CTLA4) and other treatment modalities (targeted therapy such as KIT inhibitors and VEGF inhibitors, as well as radiotherapy) on survival outcomes in MM to develop clinical guidelines for evidence-based management.

Methods

The protocol was prospectively registered on PROSPERO (PROSPERO ID: CRD42023411195). PubMed, Embase, Cochrane Central Register of Controlled Trials (CENTRAL), Web of Science and Google Scholar were searched from inception until 25 July 2024, for all cohort and observational studies. Eligible studies included those with five or more participants with locally advanced or metastatic MM treated with anti-PD1, anti-CTLA4, VEGF inhibitors and/or KIT inhibitors. Titles and abstracts of potential articles were screened and full texts of all potentially eligible studies were retrieved and reviewed by two independent reviewers. Individual patient data (IPD) from published Kaplan-Meier curves were reconstructed using a graphical reconstruction method and pooled as a one-stage meta-analysis. A sensitivity analysis using a two-stage meta-analysis approach was conducted. Extracted outcomes included overall survival (OS) and progression-free survival (PFS). For each treatment arm, median survival time and 12-month survival proportion were estimated. Data from double-arm trials was pooled to estimate hazard ratios (HRs), ratios of restricted mean time lost (RMTL) and restricted mean survival time (RMST).

Findings

From a total of 7402 studies, 35 eligible studies comprising a total of 2833 participants were included. Combined anti-PD1 and anti-CTLA4 therapy had the highest 12-month OS and 12-month PFS at 71.8% (95% CI: 67.6%, 76.2%, n = 476) and 35.1% (95% CI: 30.5%, 40.4%, n = 401) respectively, followed by anti-PD1 therapy alone (OS: 64.0% (95% CI: 61.4%, 66.7%, n = 1399); PFS: was 28.3% (95% CI: 25.8%, 31.2%, n = 1142), anti-PD1 and VEGF inhibitor combination therapy (OS: 57.1% (95% CI: 51.0%, 63.9%)), KIT inhibitors (OS: 48.2% (95% CI: 37.6%, 61.8%); PFS: 8.3% (95% CI: 3.7%, 18.7%)) and anti-CTLA4 therapy alone (OS: 33.3% (95% CI: 28.4%, 39.1%); PFS: 9.8% (95% CI: 5.9%, 16.5%)). In the double-arm studies, combination therapy with anti-PD1 and anti-CTLA4 had similar OS and PFS with anti-PD1 alone (OS: HR 0.856 (95% CI: 0.704, 1.04); RMTL ratio 0.932 (95% CI: 0.832, 1.044, P = 0.225); RMST ratio 1.102 (95% CI: 0.948, 1.281, P = 0.204); PFS: HR 0.919 (95% CI: 0.788, 1.07); RMTL ratio 0.936 (95% CI: 0.866, 1.013, P = 0.100); RMST ratio 1.21 (95% CI: 0.979, 1.496, P = 0.078)), however, anti-PD1 therapy alone had significantly better PFS than anti-CTLA4 alone (HR 0.548 (95% CI: 0.376, 0.799); RMTL ratio 0.715 (95% CI: 0.606, 0.844, P < 0.001); RMST ratio 1.659 (95% CI: 1.316, 2.092, P < 0.001)). Anti-PD1 therapy with radiotherapy versus anti-PD1 alone showed no significant difference (OS: HR 0.854 (95% CI: 0.567, 1.29); RMTL ratio 0.855 (95% CI: 0.675, 1.083, P = 0.193); RMST ratio 1.194 (95% CI: 0.928, 1.536, P = 0.168; PFS: HR 0.994 (95% CI: 0.710, 1.39); RMTL ratio 1.006 (95% CI: 0.87, 1.162, P = 0.939); RMST ratio 0.984 (95% CI: 0.658, 1.472, P = 0.939)).

Interpretation

For the systemic treatment of MM, anti-PD1 is the best monotherapy. While combining anti-PD1 with other treatment options such as anti-CTLA4, VEGF inhibitors or radiotherapy might achieve better outcomes, these improvements did not reach statistical significance when evaluated by HR, RMTL and RMST ratios.

Funding

This work was supported by the National Medical Research Council Transition Award (TA20nov-0020), SingHealth Duke-NUS Oncology Academic Clinical Programme (08/FY2020/EX/67-A143 and 08/FY2021/EX/17-A47), the Khoo Pilot Collaborative Award (Duke-NUS-KP(Coll)/2022/0020A), the National Medical Research Council Clinician Scientist-Individual Research Grant-New Investigator Grant (CNIGnov-0025), the Terry Fox Grant (I1056) and the Khoo Bridge Funding Award (Duke-NUS-KBrFA/2024/0083I).

Comparison of efficacy between anti-PD-1 antibody monotherapy and nivolumab plus ipilimumab therapy as first-line immunotherapy for advanced mucosal melanoma in Japanese patients: A single-center, retrospective cohort study

Mucosal malignant melanoma (MMM) is a rare subtype of malignant melanoma with a more aggressive biological behavior than cutaneous melanoma (CM). Owing to its rarity, it is necessary to accumulate information on treatments, especially in Asians, in whom MMM occurs more frequently than in Caucasians. In this study, we investigated the efficacy and adverse events (AEs) of nivolumab plus ipilimumab therapy (NIVO+IPI) versus immune checkpoint inhibitor (ICI) monotherapy (PD-1) in Japanese patients with MMM. We reviewed patients with advanced or recurrent MMM who received ICIs as first-line systematic therapy between February 2012 and February 2024 at the Shizuoka Cancer Center. We enrolled a total of 57 patients: 10 (17.5%) were treated with NIVO+IPI, and 47 (82.5%) were treated with PD-1 as first-line systemic therapy. Objective response rates (ORR) did not differ significantly between the NIVO+IPI and PD-1 groups (40.0% vs 27.7%; p = 0.176). There was also no statistically significant difference in progression-free survival (PFS) (median PFS time: 4.3 months vs 9.9 months, log-rank test, p = 0.578) or overall survival (OS) (median OS time: 33.1 months vs. 22.8 months, log-rank test, p = 0.697) between the two groups. However, regarding AEs, grade ≥3 AEs leading to discontinuation of first-line treatment occurred in 80% of patients in the NIVO+IPI group and in 22.6% of patients in the PD-1 group (p = 0.002). No difference was found in the efficacy of NIVO+IPI therapy and anti-PD-1 antibody monotherapy as the first-line treatment for MMM in Japanese patients, but an increase in AEs was observed with combination therapy. This study suggests that patients with MMM may receive less benefit from NIVO+IPI than from PD-1.

Analysis of Risk Factors for Death from Melanoma and Genitourinary Diseases in Male Patients with Cutaneous Melanoma: A Cohort Propensity Score Matching Study

Objective

To analyze the influencing factors of male cutaneous melanoma (CM) patients dying from genitourinary diseases (GUD).

Methods

We searched the surveillance, epidemiology, and end results (SEER) database and extracted data on male CM patients according to the inclusion and exclusion criteria, including male patients whose cause of death was CM (cohort A) or GUD (cohort B). Comparisons between the two cohorts were performed before and after propensity score matching (PSM). An interaction analysis between age and year of diagnosis was also conducted. Cox regression analysis were performed to find the risk factors for death from GUD.

Results

Seven thousand seventy-eight CM patients were included, including 6415 (90.6%) in cohort A and 663 (9.4%) in cohort B. Compared with cohort A, cohort B patients were older (median age 74 ys. vs 65 ys.) and were more under the localized stage and had longer survival time no matter before or after PSM (all p<0.001). The stage was an inhibitory factor for cohort B (p <0.001). After PSM, only age and year of diagnosis were found to be cohort B's promoting factors (p<0.001). The interaction analysis showed that older patients diagnosed in later years (2009-2020) had a higher risk of dying from GUD compared to those diagnosed earlier (p<0.05). Patients with a later year of diagnosis (2009-2020) had a lower median survival time than patients with an earlier year of diagnosis (2000-2008) (p<0.001). When the patient's year of diagnosis was earlier (2000-2008), older patients (>75 ys.) had a higher risk of dying from GUD than younger patients (≤75 ys.) (p<0.001).

Conclusion

We first reported a significant interaction between age and year of diagnosis in male CM patients dying from GUD, highlighting the increased risk in older patients diagnosed more recently. We may pay attention to the possibility of dying from genitourinary diseases for CM patients.

Toripalimab in combination with HBM4003, an anti-CTLA-4 heavy chain-only antibody, in advanced melanoma and other solid tumors: an open-label phase I trial

BACKGROUND

HBM4003 is a novel anti-CTLA-4 heavy chain-only antibody, designed to enhance Treg ablation and antibody-dependent cell-mediated cytotoxicity while ensuring a manageable safety profile. This phase I trial investigated the safety, pharmacokinetics, immunogenicity and preliminary efficacy of HBM4003 plus with anti-PD-1 antibody toripalimab in patients with advanced solid tumors, especially focusing on melanoma.

METHODS

The multicenter, open-label phase I trial was divided into two parts: dose-escalation phase (part 1) and dose-expansion phase (part 2). In part 1, HBM4003 was administered at doses of 0.03, 0.1, 0.3 mg/kg in combination with toripalimab with fixed dosage of 240 mg every 3 weeks. The recommended phase II dose (RP2D) was used in the expansion phase. Primary endpoints were safety and RP2D in part 1 and objective response rate (ORR) in part 2. Biomarkers based on cytokines and multiplex immunofluorescence staining were explored.

RESULTS

A total of 40 patients received study treatment, including 36 patients treated with RP2D of HBM4003 0.3 mg/kg plus toripalimab 240 mg every 3 week. 36 participants (90.0%) experienced at least one treatment-related adverse event (TRAE), of which 10 (25.0%) patients experienced grade ≥3 TRAEs and 5 (12.5%) experienced immune-mediated adverse events (irAEs) with maximum severity of grade 3. No grade 4 or 5 irAEs occurred. Efficacy analysis set included 32 melanoma patients treated with RP2D and with available post-baseline imaging data. The ORRs of anti-PD-1/PD-L1 treatment-naïve subgroup and anti-PD-1/PD-L1 treatment-failed subgroup were 33.3% and 5.9%, respectively. In mucosal melanoma, the ORR of the two subgroups were 40.0% and 10.0%, respectively. Baseline high Treg/CD4+ratio in the tumor serves as an independent predictive factor for the efficacy of immunotherapy.

CONCLUSIONS

HBM4003 0.3 mg/kg plus toripalimab 240 mg every 3 week demonstrated manageable safety in solid tumors and no new safety signal. Limited data demonstrated promising antitumor activity, especially in PD-1 treatment-naïve mucosal melanoma.

TRIAL REGISTRATION NUMBER

NCT04727164.

Efficacy of axitinib in a US cohort of patients with programmed cell death protein 1-resistant mucosal melanoma

Mucosal melanoma is a rare melanoma subtype, accounting for about 1% of all diagnosed melanomas. It is characterized by an aggressive phenotype with a poor prognosis and a low response rate to approved treatments. We retrospectively analyzed the clinical features, treatments, and outcomes of patients diagnosed with mucosal melanoma treated with axitinib ± anti-programmed cell death protein 1 (PD-1) therapy at a single US referral center between 2018 and 2021. Radiologic response was assessed according to Response Evaluation Criteria in Solid Tumors (RECIST), v1.1. Twenty-three patients were included in this study. In all, 78% were females with a median age of 62 years. The originating site of mucosal melanoma was the sinonasal (35%), genitourinary (35%), and gastrointestinal (30%) tracts. Sixty-five percent of patients had M1c or M1d disease and 0% had BRAF V600 mutations detected. The majority (96%) had prior treatment inclusive of anti-PD-1, with a median of 2 prior lines, and 78% of patients received a combination of axitinib and PD-1 and the median duration of treatment was 3.2 months. The overall response rate was 13% and the disease control rate was 26%. The median progression-free survival was 3.2 months, and the median overall survival was 8.2 months. Overall, the regimen was well tolerated with 39% of patients requiring dose reduction and 9% requiring treatment cessation. Axitinib with anti-PD-1 therapy has modest clinical activity in heavily pretreated patients with mucosal melanoma outside of Asia, including some with long-term benefits. This data supports the worldwide clinical trials evaluating this combination and the role of incorporating vascular endothelial growth factor-based therapy in the therapeutic paradigm for patients with mucosal melanoma.

The Evaluation of Immune Checkpoint Inhibitors and BRAF/MEK Inhibitors in Different Therapy Lines for Metastatic Melanoma: A Retrospective Study

Background: Nivolumab plus ipilimumab (nivo/ipi) combination therapy is highly effective in treating advanced melanoma, but serious immune-related adverse events (irAEs) are prevalent. The overall response rate (ORR) of the BRAF inhibitor plus MEK inhibitor (BRAFi/MEKi) combination therapy for BRAFV600-mutant advanced melanoma surpasses that of immune checkpoint inhibitors (ICIs). However, the OS and PFS of BRAFi/MEKi combination therapy are inferior to those of ICIs. Methods: We retrospectively evaluated 22 melanoma patients treated with nivo/ipi therapy and 13 patients treated with encorafenib plus binimetinib (enco/bini) between November 2018 and July 2023. Results: The ORR of nivo/ipi for metastatic melanoma patients was significantly higher in the first-line cohort [60.0% (95% CI: 31.2-83.3%)] than in the second-line or beyond cohort [8.3% (95% CI: 0-37.5%)], whereas the ORR of enco/bini was comparable between the first-line cohort [75.0% (95% CI: 28.9-96.6%)] and the second-line or beyond cohort [77.8% (95% CI: 44.3-94.7%)]. The median PFS of nivo/ipi significantly improved in the first-line cohort [7.7 months (95% CI: 2.0-11.9)] compared to the second-line or beyond cohort [2.3 months (95% CI: 0.5-6.0)] (p = 0.0109). In addition to efficacy, the incidence of grade 3 or greater AEs was comparable in the first-line and second-line or beyond cohorts. Conclusions: Although our present data are based on a small number of cases, they suggest that nivo/ipi should be administered as the first-line therapy for the treatment of BRAFV600-mutant metastatic melanoma, rather than enco/bini, aligning with findings from previous clinical trials.

Optimal strategy in managing advanced melanoma

The advent of immune checkpoint inhibitors and combination therapy with BRAF inhibitors and MEK inhibitors has dramatically improved the prognosis of advanced melanoma. However, since acral melanoma and mucosal melanoma, which are rare in Western countries but are major subtypes of melanoma in East Asia, including Japan, have a low frequency of BRAF mutations, there are currently no treatment options other than immune checkpoint inhibitors in most such cases. Furthermore, owing to a lower tumor mutation burden, immune checkpoint inhibitors are less effective in acral and mucosal melanoma than in cutaneous melanoma. The aim of this review was to summarize the current status and future prospects for the treatment of advanced melanoma, comparing cutaneous melanoma, acral melanoma, and mucosal melanoma.

Long-term survival with systemic therapy in the last decade: Can melanoma be cured?

Immune checkpoint inhibitors have been shown to prolong survival of patients with several types of cancer, and the finding was first established in melanoma. Previously, systemic therapy for advanced melanoma aimed only at tumor control and palliation of symptoms. However, in recent years, some patients who received systemic therapy have achieved a complete response and survived without continuous treatment for more than several years. This review discusses the long-term survival rates achieved with currently used systemic therapies and their future perspectives. Long-term survival is currently most likely to be achieved with the use of the standard-dose combination of nivolumab plus ipilimumab, however, this regimen is associated with a high frequency of serious or persistent immune-related adverse events. Several new anti-PD-1-based combination therapies with a better risk-benefit balance are currently under development. Although the acral and mucosal subtypes tend to be less responsive to immune checkpoint inhibitors, anti-PD-1-based combination therapy should continue to be investigated for these subtypes owing to its potential for better long-term survival. With the development of efficacious immunotherapy and targeted therapy, it is important to determine the optimal duration of systemic therapy to avoid unnecessary health and financial burdens as well as to improve efforts to support long-term cancer survivors. As the goal of systemic therapy shifts from tumor control to long-term survival, in future clinical trials, long-term clinical outcomes should be evaluated to assess the benefits of novel agents.

Multidisciplinary approach and treatment of acral and mucosal melanoma

Acral and mucosal melanoma are uncommon variants of melanoma. Acral melanoma has an age-adjusted incidence of approximately 1.8 cases per million individuals per year, accounting for about 2% to 3% of all melanoma cases. On the other hand, mucosal melanoma, with an incidence of 2.2 cases per million per year, makes up around 1.3% of all melanoma cases. These melanomas, in addition to being biologically and clinically distinct from cutaneous melanoma, share certain clinical and pathologic characteristics. These include a more aggressive nature and a less favorable prognosis. Furthermore, they exhibit a different mutational pattern, with KIT mutations being more prevalent in acral and mucosal melanomas. This divergence in mutational patterns may partially account for the relatively poorer prognosis, particularly to immune checkpoint inhibitors. This review explores various aspects of acral and mucosal melanoma, including their clinical presentation, pathologic features, mutational profiles, current therapeutic approaches, outcomes associated with systemic therapy, and potential strategies to address resistance to existing treatments.

Rare malignant neoplasm of the esophagus: current status and future perspectives

Esophageal cancer is common worldwide, including in Japan, and its major histological subtype is squamous cell carcinoma. However, there are some rare esophageal cancers, including neuroendocrine neoplasm, gastrointestinal stromal tumor, carcinosarcoma and malignant melanoma. The biological and clinical features of these cancers differ from those of esophageal squamous cell carcinoma. Therefore, different treatment strategies are needed for these cancers but are based on limited evidence. Neuroendocrine neoplasm is mainly divided into neuroendocrine tumor and neuroendocrine carcinoma by differentiation and the Ki-67 proliferation index or mitotic index. Epidemiologically, the majority of esophageal neuroendocrine neoplasms are neuroendocrine carcinoma. The treatment of neuroendocrine carcinoma is similar to that of small cell lung cancer, which has similar morphological and biological features. Gastrointestinal stromal tumor is known to be associated with alterations in the c-KIT and platelet-derived growth factor receptor genes and, if resectable, is treated in accordance with the modified Fletcher classification. Carcinosarcoma is generally resistant to both chemotherapy and radiotherapy and requires multimodal treatments such as surgery plus chemotherapy to achieve cure. Primary malignant melanoma is resistant to cytotoxic chemotherapy, but immune checkpoint inhibitors have recently demonstrated efficacy for malignant melanoma of the esophagus. This review focuses on the current status and future perspectives for rare cancer of the esophagus.

A single-center retrospective analysis of prognoses in patients with melanoma brain metastases and effectiveness of treatment in Japan

BACKGROUND

Melanoma brain metastasis (MBM) has a poor prognosis, although recent treatments, including immune checkpoint inhibitors and targeted therapy, have improved the prognosis. However, these systemic therapies have been reported to be less efficient for Asian patients. We investigated the survival of Asian patients with MBM and the effectiveness of systemic therapies.

METHODS

We retrospectively reviewed the survival rates of patients diagnosed with MBM between January 2011 and December 2021 at the National Cancer Center Hospital in Tokyo, Japan. In addition, we identified factors associated with survival using Cox regression analysis.

RESULTS

A total of 135 patients were included. The median overall survival (OS) after an MBM diagnosis was 7.8 months (95% confidence interval [CI] 6.1-9.6). The 6-month and 1-year survival rates were 60.7% and 34.8%, respectively. We identified the prognostic factors of MBM, including non-acral primary location, low serum LDH levels, systemic therapy of single-agent immune checkpoint inhibitors (ICIs) or targeted therapies (TTs), and radiotherapy of stereotactic irradiation (STI). We found no significant difference in effectiveness between single-agent ICIs, the combination of Nivolumab and Ipilimumab (COMBI-ICI), and TTs (COMBI-ICI vs. single-agent ICI, hazard ratio 0.71, 95% confidence interval 0.27-1.88, p = 0.49; COMBI-ICI vs. TT: hazard ratio 0.46, 95% confidence interval 0.14-1.55, p = 0.21).

CONCLUSIONS

Systemic therapy and radiotherapy have improved the survival of MBM patients, but the survival of Asian patients remains poor. Our findings suggest that COMBI-ICIs are not significantly more effective than single-agent ICI or TT in treating MBM.

Efficacy of Nivolumab and Ipilimumab Combined Therapy as a First-Line Therapy for Patients with Advanced Melanoma and the Urgent Need for an Effective Second-Line Therapy for Patients with Wild-Type BRAF in Japan: A Single Center Retrospective Study

Therapeutic advantages of immune checkpoint inhibitors, anti-programmed death-1 (PD-1), and anticytotoxic T-lymphocyte-associated antigen 4 (CTLA-4) in melanoma have been reported recently. In this study, we conducted a retrospective study to evaluate the clinical efficacy and safety of the combined use of nivolumab and ipilimumab as a first-line therapy for Japanese patients with advanced melanoma. Moreover, we examined the effects of second-line treatment. Seven patients were enrolled in this study. The median progression-free survival (PFS) and median overall survival (OS) were 7 months (95%CI, 1.868-12.132) and 12 months (95%CI, 0.000- 27.397), respectively. The objective response rate (ORR) and the disease control rate (DCR) were 42.9 % and 85.7 %. Three patients chose pembrolizumab monotherapy as second-line therapy after the combination therapy due to their BRAF wild-type status, which resulted in progressive disease. ORR and DCR were 0% and 33.3%, respectively, with pembrolizumab. Grade 3 or 4 immune-related adverse events occurred in 71.4% of the patients treated with the combined-therapy. All irAEs were treated with corticosteroid or hormone replacement therapy. Although this single center retrospective study had some limitations, it demonstrated good efficacy for the combined use of nivolumab and ipilimumab as a first-line therapy for Japanese patients with advanced melanoma. Moreover, poor efficacy was observed for the second-line therapy after the combined therapy. These findings suggest that a novel second-line therapy is required for patients with advanced melanoma in Japan, particularly for patients with wildtype BRAF.

Proceedings from the Melanoma Research Foundation Mucosal Melanoma Meeting (December 16, 2022, New York, USA)

Mucosal melanoma remains a rare cancer with high mortality and a paucity of therapeutic options. This is due in significant part to its low incidence leading to limited patient access to expert care and downstream clinical/basic science data for research interrogation. Clinical challenges such as delayed and at times inaccurate diagnoses, and lack of consensus tumor staging have added to the suboptimal outcomes for these patients. Clinical trials, while promising, have been difficult to activate and accrue. While individual institutions and investigators have attempted to seek solutions to such problems, international, national, and local partnership may provide the keys to more efficient and innovative paths forward. Furthermore, a mucosal melanoma coalition would provide a potential network for patients and caregivers to seek expert opinion and advice. The Melanoma Research Foundation Mucosal Melanoma Meeting (December 16, 2022, New York, USA) highlighted the current clinical challenges faced by patients, providers, and scientists, identified current and future clinical trial investigations in this rare disease space, and aimed to increase national and international collaboration among the mucosal melanoma community in an effort to improve patient outcomes. The included proceedings highlight the clinical challenges of mucosal melanoma, global clinical trial experience, basic science advances in mucosal melanoma, and future directions, including the creation of shared rare tumor registries and enhanced collaborations.

Mucosal Melanoma: Epidemiology, Clinical Features, and Treatment

PURPOSE OF REVIEW

Summarize the writings published in the last years on the management and novel therapies of mucosal melanoma (MM).

RECENT FINDINGS

New research has demonstrated a difference between MM and cutaneous melanoma (CM) in their genomic and molecular landscapes, explaining the response's heterogeneity. Immunotherapy and targeted therapy have limited benefit, but novel therapies are rapidly expanding. MM is aggressive cancer occurring in gastrointestinal, respiratory, or urogenital mucosa; whose incidence is greater in the Asian population. The etiology and pathogenesis remain unclear since UV exposure is not a proven risk factor as in cutaneous melanoma. In contrast to CM, lesions on the mucosal surface are less likely to be recognized early; therefore, the disease is diagnosed in an advanced stage. Clinical manifestations, such as bleeding or pain, can help to detect this tumor, although the prognosis remains unfavorable with an overall 5-year survival rate of less than 20%. The mutational landscape of MM includes mutations of BRAF and NRAS, as well as mutations in the c-KIT/CD117 gene (in 50% of patients), thus limiting therapeutic interventions to immunotherapy. However, clinical studies show less responsiveness to immunotherapy compared to CM, therefore novel therapeutic strategies targeting new molecules are needed to improve the survival of patients with MM.

Immune checkpoint inhibitor-based therapy for advanced acral and mucosal melanoma

Acral melanoma (AM) and mucosal melanomas (MM) are rare clinical subtypes of melanoma. AM and MM are etiologically, biologically, and molecularly distinct from cutaneous melanoma (CM). Despite the recent development of immune checkpoint inhibitors (ICIs) for the treatment of advanced CMs, the true therapeutic efficacy of ICIs for these rare subtypes remains unclear. Since these subtypes are rare, especially in the Caucasian population, their biological features and corresponding novel therapies are underexplored than those of CM. Even in the larger phase III clinical trials for ICIs, the sample size of patients with AM and MM is limited. Consequently, establishment of standard of care for advanced AM and MM has been challenging. This review covers current update and overview on clinical efficacy of ICIs and ICI-based therapy for advanced AM and MM, based mainly on the reported clinical trials, prospective observational studies, and retrospective studies, to provide a better understanding of the current landscape of this field. In addition, we discuss the future direction of treatment for those rare clinical subtypes, focusing on issues relevant to dermatology and medical oncology.

Analyzing the relationship between the efficacy of first-line immune checkpoint inhibitors and cumulative sun damage in Japanese patients with advanced BRAF wild-type nonacral cutaneous melanoma: A retrospective real-world, multicenter study

BACKGROUND

Efficacy of anti-PD-1 antibody monotherapy (PD1) or anti-PD-1 plus anti-CTLA-4 combination therapy (PD1 +CTLA4) for melanoma is affected by its clinical subtype. The amount of tumor mutation burden (TMB) caused by cumulative sun damage (CSD) is occasionally used to explain this; however, their relationship in Japanese nonacral cutaneous melanoma (NACM) is still unclear.

OBJECTIVE

To analyze the ICI efficacy and its relationship with CSD of the primary lesion in Japanese patients with NACM.

METHODS

Japanese patients with advanced BRAF wild-type NACM who received first-line ICIs were recruited. Objective response rate (ORR), progression-free survival (PFS), and overall survival (OS), and the degree of solar elastosis (SE) were evaluated.

RESULTS

A total of 146 patients (PD1 group 113 and PD1 +CTLA4 group 33) were included. No significant differences in ORR were observed between the PD1 and PD1 +CTLA4 groups (35 % vs. 36 %; P = 0.67) or PFS and OS (median PFS 6.1 months vs. 8.5 months; P = 0.46, median OS 28.1 months vs. not reached; P = 0.59). Multivariate survival analysis revealed that PD1 +CTLA4 did not prolong the PFS and OS. The SE score had no effect on either PFS or OS.

CONCLUSIONS

ICI efficacy was not as high as those reported in Western countries, and PD1 +CTLA4 did not present better clinical efficacy compared to PD1. Indicators of CSD did not serve as a predictor for clinical advantage. These findings may partially support the theory that ICI efficacy is affected by CSD; however, other unrecognized factors may also exist.

Future prospects for cancer immunotherapy using induced pluripotent stem cell-derived dendritic cells or macrophages

Cancer immunotherapy is now the first-line treatment for many unresectable cancers. However, it remains far from a complete cure for all patients. Therefore, it is necessary to develop innovative methods for cancer immunotherapy, and immune cell therapy could be an option. Currently, several institutions are attempting to generate immune cells from induced pluripotent stem cells (iPSCs) for use in cancer immunotherapy. A method for generating dendritic cells (DCs) and macrophages (MPs) from iPSC has been established. iPSC-derived DCs (iPS-DCs) can activate T cells via antigen presentation, and iPSC-derived macrophages (iPS-MPs) attack cancer. Since iPSCs are used as the source, genetic modification is easy, and various immune functions, such as the production of anti-tumour cytokines, can be added. Furthermore, when iPS-DCs and iPS-MPs are immortalized, cost reduction through mass production is theoretically possible. In this review, the achievements of cancer research using iPS-DCs and iPS-MPs are summarized, and the prospects for the future are discussed.

Trends in Incidence and Survival of 1496 Patients with Mucosal Melanoma in The Netherlands (1990-2019)

BACKGROUND

Mucosal melanoma (MM) is a rare tumour with a poor prognosis. Over the years, immune and targeted therapy have become available and have improved overall survival (OS) for patients with advanced cutaneous melanoma (CM). This study aimed to assess trends in the incidence and survival of MM in the Netherlands against the background of new effective treatments that became available for advanced melanoma.

METHODS

We obtained information on patients diagnosed with MM during 1990-2019 from the Netherlands Cancer Registry. The age-standardized incidence rate and estimated annual percentage change (EAPC) were calculated over the total study period. OS was calculated using the Kaplan-Meier method. Independent predictors for OS were assessed by applying multivariable Cox proportional hazards regression models.

RESULTS

In total, 1496 patients were diagnosed with MM during 1990-2019, mostly in the female genital tract (43%) and the head and neck region (34%). The majority presented with local or locally advanced disease (66%). The incidence remained stable over time (EAPC 3.0%, p = 0.4). The 5-year OS was 24% (95%CI: 21.6-26.0%) with a median OS of 1.7 years (95%CI: 1.6-1.8). Age ≥ 70 years at diagnosis, higher stage at diagnosis, and respiratory tract location were independent predictors for worse OS. Diagnosis in the period 2014-2019, MM located in the female genital tract, and treatment with immune or targeted therapy were independent predictors for better OS.

CONCLUSION

Since the introduction of immune and targeted therapies, OS has improved for patients with MM. However, the prognosis of MM patients is still lower compared to CM, and the median OS of patients treated with immune and targeted therapies remains fairly short. Further studies are needed to improve outcomes for patients with MM.

Characteristic cerebrospinal fluid findings in immune checkpoint inhibitor-related peripheral neuropathy: A case report

Although immune checkpoint inhibitors (ICIs) are widely used to treat unresectable malignant tumors, they can cause undesirable side effects called immune-related adverse events, including neurological toxicities. Here, we describe a case of ICI-related peripheral neuropathy (irPN) with characteristic cerebrospinal fluid (CSF) findings. In addition to pleocytosis and increased protein levels, the present case showed increased levels of CSF soluble interleukin-2 receptor (sIL-2R), IL-6, and IL-10, suggesting activated T cell-related autoimmunity. We believe that CSF cytokines and sIL-2R could be novel biomarkers of irPN.

Updated analysis of nivolumab and ipilimumab combination therapy in Japanese patients with advanced melanoma

The efficacy and safety of nivolumab and ipilimumab (N + I) combination therapy for Japanese patients with advanced unresectable melanoma was re-evaluated in clinical practice. One hundred Japanese patients with advanced melanoma were included. The overall response rate was 24%; complete response (CR), 6%; partial response, 18%. The response rates were 33.3% in the systemic therapy-naïve and 15.4% in the prior-treatment groups, and 16.1% for patients who were treated with first-line anti-programmed death 1 antibody monotherapy followed by second-line N + I therapy after progression of the disease. The response rate for cutaneous melanoma was 32.7%, and 47.8% in the naïve group. Response rates for non-acral, acral, and mucosal melanoma were 34.9%, 25%, and 16.7%, respectively. The median progression-free survival (PFS) for all patients was 3.25 months (6.5 and 2.5 months in the naïve and prior-treatment groups, respectively). Median overall survival (OS) was 14.5 months (25.25 and 7.5 months in the naïve and prior-treatment groups, respectively). There were no significant differences in PFS or OS for patients with non-acral, acral, or mucosal melanoma. The 3-year PFS and OS were both 100% in patients who achieved CR with combination therapy. Adverse events occurred in 89% and were grade three or higher in 56% of cases. Although direct comparisons cannot be made due to different patient backgrounds, N + I combination therapy in Japanese patients in clinical practice tended to be inferior when compared to global study and non-Asian patients in clinical practice. The highest response rate was in the cutaneous melanoma therapy-naïve group. The best tumor response was associated with survival outcome, and the PFS and OS were good in cases where CR was obtained. The proportion of grade three and four adverse events was as high as that in the global study.

Immunotherapy Options for Acral Melanoma, A fast-growing but Neglected Malignancy

Melanoma is the deadliest form of skin cancer. It is classified as cutaneous and non-cutaneous, with the former characterized by developing in sun-exposed areas of the skin, UV-light radiation being its most important risk factor and ordinarily affecting fair skin populations. In recent years, the incidence of melanoma has been increasing in populations with darker complexion, for example, Hispanics, in which acral melanoma is highly prevalent. The WHO estimates that the incidence and mortality of melanoma will increase by more than 60% by 2040, particularly in low/medium income countries. Acral melanoma appears in the palms, soles and nails, and because of these occult locations, it is often considered different from other cutaneous melanomas even though it also originates in the skin. Acral melanoma is very rare in Caucasian populations and is often not included from genetic analysis and clinical trials. In this review, we present the worldwide epidemiology of acral melanoma; we summarize its genetic characterization and point out important signaling pathways for targeted therapy. We also discuss how genetic analyses have shown that acral melanoma carries a sufficient mutational load and neoantigen formation to be targeted by the immune system, arguing for a potential benefit with novel immunotherapeutic strategies, alone or combined with targeted therapy. This is important because chemotherapy remains the first-line treatment in non-developed nations despite a disheartening response. In summary, the increased incidence and mortality of acral melanoma in low/medium income countries calls for increasing our knowledge about its nature and therapeutic options and leveling off the asymmetric research conducted primarily on Caucasian populations.

Cuproptosis key gene FDX1 is a prognostic biomarker and associated with immune infiltration in glioma

Recent studies have found that the protein encoded by the FDX1 gene is involved in mediating Cuproptosis as a regulator of protein lipoylation and related to immune response process of tumors. However, the specific biological function of FDX1 in glioma is currently unclear. To explore the potential function of FDX1, this study explored the correlation between the expression of FDX1 in cancers and survival prognosis by analyzing the public databases of GEPIA and Cbioportal. Immune infiltration was analyzed by the TIMER2.0 database in tumors. The possible biological processes and functions of FDX1-related in glioma were annotated through gene enrichment. Relationship between Cuproptosis and autophagy was explored through gene co-expression studies. Summary and conclusions of this study: (1) FDX1 is highly expressed in gliomas and associated with poor prognosis in low-grade gliomas (LGG). (2) Gene annotation indicates that FDX1 is mainly involved in the tumor protein lipoylation and cell death. (3) FDX1 expression is positively correlated with the infiltration of immune cells. (4) LIPT2 and NNAT, two other genes involved in lipoylation, may be unidentified marker gene for Cuproptosis. And the Cuproptosis genes related to FDX1 were positively correlated with the expression of autophagy marker genes Atg5, Atg12, and BECN-1. This evidence suggests that there may be some interaction between FDX1 mediated Cuproptosis and autophagy. In summary, FDX1 may serve as a potential immunotherapy target and prognostic marker for Glioma.

Atezolizumab plus Bevacizumab in Patients with Unresectable or Metastatic Mucosal Melanoma: A Multicenter, Open-Label, Single-Arm Phase II Study

PURPOSE

Anti-programmed cell death-1 monotherapy is part of standard therapy for cutaneous melanoma but has low efficacy in mucosal melanoma. We evaluated the efficacy and safety of atezolizumab plus bevacizumab as first-line therapy for advanced mucosal melanoma.

PATIENTS AND METHODS

This multicenter, open-label, single-arm, phase II study used a Simon's two-stage design. Atezolizumab (fixed-dose, 1,200 mg) and bevacizumab (7.5 mg/kg) were administered by intravenous infusion every 3 weeks. The primary endpoint was objective response rate (ORR), determined per RECIST v1.1. Secondary endpoints included progression-free survival (PFS), overall survival (OS), duration of response (DOR), and safety, with adverse events (AE) summarized using NCI-CTCAE v5.0.

RESULTS

Overall, 43 patients were enrolled, including 20 (46.5%) with unresectable and 23 (53.5%) with metastatic mucosal melanoma. Median follow-up was 13.4 months at data cutoff (July 30, 2021). Forty patients were evaluable for response: ORR was 45.0% [95% confidence interval (CI), 29.3%-61.5%; one complete response, 17 partial responses]. Median PFS was 8.2 months (95% CI, 2.7-9.6); 6- and 12-month PFS rates were 53.4% (95% CI, 36.6%-67.6%) and 28.1% (95% CI, 14.2%-43.9%), respectively. Median OS was not reached (NR; 95% CI, 14.4-NR). Six- and 12-month OS rates were 92.5% (95% CI, 78.5%-97.5%) and 76.0% (95% CI, 57.1%-87.5%), respectively. Median DOR was 12.5 months (95% CI, 5.5-NR). Overall, 90.7% (39/43) of patients experienced treatment-related AEs; 25.6% (11/43) experienced grade ≥3 events.

CONCLUSIONS

Atezolizumab in combination with bevacizumab showed promising efficacy and manageable safety in patients with advanced mucosal melanoma.

Management of Acral and Mucosal Melanoma: Medical Oncology Perspective

Acral and mucosal melanomas (MM) are rare subtypes of melanoma that are biologically and clinically distinct from cutaneous melanoma. Despite the progress in the treatment of cutaneous melanomas with the development of targeted and immune therapies, the therapeutic options for these less common subtypes remain limited. Difficulties in early diagnosis, the aggressive nature of the disease, and the frequently occult sites of origin have also contributed to the poor prognosis associated with acral and MM, with substantially worse long-term prognosis. The rarity of these subtypes has posed significant barriers to better understanding their biological features and investigating novel therapies. Consequently, establishing standardized treatment guidelines has been a challenge. In this review, we provide a brief overview of the current knowledge regarding acral and MM, focusing on their epidemiology, genetic backgrounds, and unique clinical characteristics. Further discussion centers around the management of primary and advanced disease and the role of emerging targeted and immune therapies for these subtypes, specifically focusing on issues relevant to medical oncologists.

Molecular Profiling and Novel Therapeutic Strategies for Mucosal Melanoma: A Comprehensive Review

Mucosal melanoma is a rare and aggressive subtype of melanoma. Unlike its cutaneous counterpart, mucosal melanoma has only gained limited benefit from novel treatment approaches due to the lack of actionable driver mutations and poor response to immunotherapy. Over the last years, whole-genome and exome sequencing techniques have led to increased knowledge on the molecular landscape of mucosal melanoma. Molecular studies have underlined noteworthy findings with potential therapeutic implications, including the presence of KIT mutations, which are potential targets of tyrosine kinase inhibitors currently in use in the clinic (imatinib), but also SF3B1 mutation, CDK4 amplifications, and CDKN2A gene deletions, which are presently under investigation in clinical trials. Recent results from a pooled analysis of patients with mucosal melanoma treated with immunotherapy have suggested that the combination of immune checkpoint inhibitors might improve survival outcomes in this subset of patients, as compared with single-agent immunotherapy. However, these results are not confirmed across different studies, and combo-immunotherapy correlates with a higher rate of adverse events. In this review, we describe the clinical, biological, and genetic features of mucosal melanoma. We also provide an update on the results of approved systemic treatment in this setting and overview the therapeutic strategies currently under investigation in clinical trials.