ASCO 2017 – Let’s talk about NETs #ASCO17

ASCO (American Society of Clinical Oncology) is one of the biggest cancer conferences in the world normally bringing together more than 30,000 oncology professionals from around the world to discuss state-of-the-art treatment modalities, new therapies, and ongoing controversies in the field.  As Neuroendorine Tumors is on a roll in terms of new treatments and continued research, we appear to be well represented with over 20 ‘extracts’ submitted for review and display.  This is fairly complex stuff but much of it will be familiar to many.  I’ve filtered and extracted all the Neuroendocrine stuff into one list providing you with an easy to peruse table of contents, complete with relevant linkages if you need to read more.  For many the extract title and conclusion will be sufficiently educational or at least prompt you to click the link to investigate further.  Remember, these are extracts so do not contain all the details of the research or study. However, some are linked to bigger trials and linkages are shown where relevant.  I’ve also linked to some of my blog posts to add context and detail.

I’m hoping to capture any presentations or other output from the meeting which appears to be relevant and this will follow after the meeting.  I will also be actively tweeting any output from the live event (for many cancers, not just NETs).

There’s something for everyone here – I hope it’s useful.

68Ga-DOTATATE PET/CT to predict response to peptide receptor radionuclide therapy (PRRT) in neuroendocrine tumours (NETs).  

Conclusions: Objective response to PRRT defines a subset of patients with markedly improved PFS. SUVave 21.6 defines a threshold below which patients have a poor response to PRRT. This threshold should be taken forward into prospective study.

Check out my recent blog discussing ‘Theranostic pairing” – click here

Rohini Sharma 4093
A multicohort phase II study of durvalumab plus tremelimumab for the treatment of patients (PTS) with advanced neuroendocrine neoplasms (NENs) of gastroenteropancreatic (GEP) or lung origin (the DUNE trial-GETNE1601-).

News of a trial – no conclusion included.  However, see trial data NCT03095274

Ignacio Matos Garcia TPS4146
Association between duration of somatostatin analogs (SSAs) use and quality of life in patients with carcinoid syndrome in the United States based on the FACT-G instrument.

Conclusions: The duration of SSA use was positively associated with QoL benefit among CS patients. This may be explained by long-term effectiveness of SSAs or selection bias favoring patients with more indolent disease. Future studies will be needed to distinguish between these possibilities.

Daniel M. Halperin e15693
Association of weight change with telotristat ethyl in the treatment of carcinoid syndrome.

Conclusions: The incidence of weight gain was dose-related on TE and was greater than that on pbo. It was possibly related to a reduction in diarrhea severity, and it may be a relevant aspect of TE efficacy among patients with functioning metastatic NETs. Clinical trial information: NCT01677910

See my blog post Telotristat Ethyl

Martin O Weickert e15692
Blood measurements of neuroendocrine tumor (NET) transcripts and gene cluster analysis to predict efficacy of peptide radioreceptor therapy.

Conclusions: A pre-PRRT analysis of circulating NET genes, the predictive quotient index comprising “omic” analysis and grading, is validated to predict the efficacy of PRRT therapy in GEP and lung NETs.

Lisa Bodei 4091
Capecitabine and temozolomide (CAPTEM) in neuroendocrine tumor of unknown primary.

Conclusions: CAPTEM shows activity in neuroendocrine tumor of unknown primary. Currently FDA approved treatment options for grade I and grade II GI NETs includes somatostatin analogs and everolimus. Both of which are cytostatic and of limited use in case of visceral crisis or bulky disease where disease shrinkage is required. CAPTEM should be considered for grade II NETS of unknown primary.

Aman Chauhan e15691
Clinical and epidemiological features in 495 gastroenteropancreatic neuroendocrine patients in Mexico.

Conclusions: This is the first multi-center study in Mexico. Which reflects the clinical characteristics of the NET_GET. The results differ in their epidemiology from that reported in other countries. However, the clinical and therapeutic results are very similar.

Rafael Medrano Guzman e15687
Effect of lanreotide depot (LAN) on 5-hydroxyindoleacetic acid (5HIAA) and chromogranin A (CgA) in gastroenteropancreatic neuroendocrine (GEP NET) tumors: Correlation with tumor response and progression-free survival (PFS) from the phase III CLARINET study.

Conclusions: These data suggest that serotonin is secreted by nonfunctioning tumors, but does not reach the threshold required for clinical carcinoid symptoms. Monitoring 5HIAA and CgA may be useful during LAN treatment of nonfunctional GEP NETs. Clinical trial information: NCT00353496

Alexandria T. Phan 4095
Final progression-free survival (PFS) analyses for lanreotide autogel/depot 120 mg in metastatic enteropancreatic neuroendocrine tumors (NETs): The CLARINET extension study.

Conclusions: CLARINET OLE suggests sustained antitumor effects with LAN 120 mg in enteropancreatic NETs irrespective of tumor origin, and suggests benefits with LAN as early treatment. Clinical trial information: NCT00842348

Edward M. Wolin 4089
Lanreotide depot (LAN) for symptomatic control of carcinoid syndrome (CS) in neuroendocrine tumor (NET) patients previously responsive to octreotide (OCT): Subanalysis of patient-reported symptoms from the phase III elect study.

Conclusions: Pts showed improvement in CS symptoms of flushing and diarrhea and reduction in 5HIAA levels with LAN treatment, indicating efficacy of LAN regardless of prior OCT use. Transition from OCT to LAN was well tolerated among prior OCT pts in ELECT. Clinical trial information: NCT00774930

Check out my blog post about Lanreotide and Lanreotide vs Octreotide

George A. Fisher 4088
Molecular classification of neuroendocrine tumors: Clinical experience with the 92-gene assay in >24,000 cases.

Conclusions: These findings highlight the utility of molecular classification to identify distinct NET tumor types/subtypes to improve diagnostic precision and treatment decision-making. In addition, significant differences in the distribution of molecular diagnoses of NET subtype by age and gender were identified.

Andrew Eugene Hendifar e15700
Multi-omic molecular profiling of pancreatic neuroendocrine tumors.

Conclusions: In PNETS, multi-omic profiling through the KYT program identified targetable alterations in several key pathways. Outcome data will be explored.

Rishi Patel e15685
Outcomes of peptide receptor radionuclide therapy (PRRT) in metastatic grade 3 neuroendocrine tumors (NETs).

Conclusions: In this poor prognosis G3 NET cohort of whom 77% had received prior chemotherapy, a median OS of 18 months from start of PRRT is encouraging and warrants further study. PRRT is a promising treatment option for patients with G3 NET with high somatostatin-receptor expression selected by SSRI.

Mei Sim Lung e15694
Periprocedural management of patients undergoing liver resection or liver-directed therapy for neuroendocrine tumor metastases.

Conclusions: Occurrence of documented carcinoid crisis was low in this high-risk population. However, a significant proportion of patients developed hemodynamic instability, suggesting that carcinoid crisis is a spectrum diagnosis and may be clinically under-recognized. Use of octreotide was not associated with risk of carcinoid crisis or hemodynamic instability; however, this analysis was limited by our modest sample size at a single institution. There remains a need to establish an objective definition of carcinoid crisis and to inform standardization of periprocedural use of octreotide for at-risk patients.

See my blog on “Carcinoid Crisis” 

Daniel Kwon e15689
Predictive factors of carcinoid syndrome among patients with gastrointestinal neuroendocrine tumors (GI NETs).

Conclusions: By assessing patients with GI NET from two independent US claim databases, this study suggested that patients diagnosed with CS were 2-3 times more likely to be diagnosed with liver disorder, enlargement of lymph nodes, or abdominal mass, than those without CS during the one year prior to CS diagnosis. Future studies using patient medical charts are warranted to validate and interpret the findings. These findings, when validated, may aid physicians to diagnose CS patients earlier.

Beilei Cai e15690
Predictors of outcome in patients treated with peptide radio-labelled receptor target therapy (PRRT).

Conclusions: Radiological progression within 12 months of completion of PRRT is associated with a worse outcome in terms of OS. Patients with greater liver involvement and highest CgA levels are more likely to progress within 12 months of treatment completion. Earlier treatment with PRRT in patients with radiological progression not meeting RECIST criteria may need to be considered. There may be a greater survival benefit if PRRT is given prior to the development of large volume disease.

Dalvinder Mandair 4090
Pre-existing symptoms, resource utilization, and healthcare costs prior to diagnosis of neuroendocrine tumors: A SEER-Medicare database study.

Conclusions: To the best of our knowledge, this is the first population-based study to examine potentially relevant pre-existing symptoms, resource utilization and healthcare costs before NET diagnosis. NET patients were more likely to have certain conditions and incurred higher resource utilizations and costs in the year preceding diagnosis of NET.

Chan Shen 4092
Prevalence of co-morbidities in elderly patients with distant stage neuroendocrine tumors.

Conclusions: This population-based study showed that elderly NET pts have significantly different prevalence of co-morbidities compared to non-cancer controls. The impact of these conditions on survival and therapeutic decisions is being evaluated.

A. Dasari e15699
Prognostic factors influencing survival in small bowel neuroendocrine tumors with liver metastasis.

Conclusions: In patients with SBNET with liver metastasis, higher tumor grade and post-operative chemotherapy increased risk of death. However, resection of the primary tumor along with liver metastasis improves the 5-year OS with complete cytoreduction providing the most benefit.

Nicholas Manguso e15688
Role of 92 gene cancer classifier assay in neuroendocrine tumor of unknown primary.

Role of 92 gene cancer classifier assay in neuroendocrine tumor of unknown primary. | 2017 ASCO Annual Meeting Abstracts

Conclusions: Tissue type ID was able to identify a primary site in NETs of unknown primary in majority (94.7%) of cases. The result had direct implication in management of patients with regards to FDA approved treatment options in 13/38 patients (pNETs, merkel cell and pheochromocytoma).

Aman Chauhan e15696
Surgery in combination with peptide receptor radionuclide therapy is effective in metastatic neuroendocrine tumors and is definable by blood gene transcript analysis.

Conclusions: Radical loco-regional surgery for primary tumours combined with PRRT provides a novel, highly efficacious approach in metastasised NET. The NETest accurately measures the effectiveness of treatment.

Andreja Frilling e15697
The impact of pathologic differentiation (well/ poorly) and the degree of Ki-67 index in patients with metastatic WHO grade 3 GEP-NECs.

Conclusions: Grade 3 GEP-NECs could be morphologically classified into well and poorly differentiated NETs. Additionally, among grade 3 GEP-NECs, there was a significant difference in ranges of Ki67 index between well and poorly differentiated NECs. Higher levels ( > 60%) of Ki67 index might be a predictive marker for efficacy of EP as a standard regimen in grade 3 GEP-NECs.

Check out my blog post on Grading which has incorporated latest thinking in revised grade 3 classification

Seung Tae Kim e15686
Theranostic trial of well differentiated neuroendocrine tumors (NETs) with somatostatin antagonists 68Ga-OPS202 and 177Lu-OPS201.

Conclusions: In this trial of heavily treated NETs, preliminary data are promising for the use of 68Ga-OPS202/177Lu-OPS201 as a theranostic combination for imaging and therapy. Additional studies are planned to determine an optimal therapeutic dose and schedule. Clinical trial information: NCT02609737

Diane Lauren Reidy 4094
Use of antiresorptive therapy (ART) and skeletal-related events (SREs) in patients with bone metastases of neuroendocrine neoplasms (NEN).

Conclusions: SREs in NEN patients with BM were not uncommon, especially in patients with grade 3 NEN and osteolytic metastases. Application of ART did not significantly alter median OS or TTSRE, no subgroup with a benefit of ART could be identified. The use of ART in NEN should be questioned and evaluated prospectively.

Leonidas Apostolidis 4096
Targeted radiopeptide therapy Re188-P2045 to treat neuroendocrine lung cancer

Conclusions: Rhenium Re 188 P2045, a radiolabeled somatostatin analog, may be used to both identify and treat lung cancer tumors. The ability to image and dose patients with the same targeted molecule enables a personalized medicine approach and this highly targeted patient therapy may significantly improve treatment of tumors that over express somatostatin receptor.

Christopher Peter Adams, Wasif M. Saif e20016

Thanks for reading

Ronny
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Chemo or not Chemo – that is the question 


I’m continually seeing certain drugs for treatment of Neuroendocrine Tumours (NETs) described as chemotherapy. I think there must be some confusion with more modern drugs which are more targeted and work in a different way to Chemotherapy.

I researched several sites and they all tend to provide a summary of chemotherapy which is worded like this:  Chemotherapy means:

a treatment of cancer by using anti-cancer medicines called cytotoxic drugs.  Cytotoxic medicines are poisonous (toxic) to cancer cells. They kill cancer cells or stop them from multiplying. Different cytotoxic medicines do this in different ways. However, they all tend to work by interfering with some aspect of how the cells divide and multiply. Two or more cytotoxic medicines are often used in a course of chemotherapy, each with a different way of working. This may give a better chance of success than using only one. There are many different cytotoxic medicines used in the treatment of cancer. In each case the one (or ones) chosen will depend on the type and stage of your cancer. Interestingly, there are several statements along the lines of ‘Cytotoxic medicines work best in cancers where the cancer cells are rapidly dividing and multiplying’, a key issue with lower grade NETs.

Well known chemotherapy treatments for NETs include (but are not limited to): Capecitabine (Xeloda), Temozolomide (Temodal), Fluorouracil (5-FU), Oxaliplatin (Eloxatin) Cisplatin, Etoposide (Etopophos, Vepesid), Carboplatin, Streptozotocin (Zanosar). Some of these may be given as a combination treatment, e.g. CAPecitabine and TEMozolomide (CAPTEM).

In the past, any medication used to treat cancer was regarded as chemotherapy. However, over the last 20 years, new types of medication that work in a different way to chemotherapy have been introduced. Many of these new types of medication are known as targeted therapies. This is because they’re designed to target and disrupt one or more of the biological processes that cancerous cells use to grow and reproduce.  They are classed as biological therapy.  In contrast, chemotherapy medications are mostly systemic in nature and designed to have a poisonous effect on cancerous cells, thus the term ‘cytotoxic’.

The following well known NETs treatment are not really chemotherapy and describing them in this way is not only misleading but may actually cause alarm to other patients. Furthermore, if you check any authoritative NET Cancer specialist or advocate organisation; any general and authoritative cancer site or the manufacturer’s websites; you will not see the drugs below listed within the term chemotherapy.

Somatostatin Analogues e.g. Sandostatin (Octreotide), Somatuline (Lanreotide).  Although these drugs have an anti-cancer effect for some, they are in fact hormone inhibitors and are therefore a hormone therapy.

Everolimus (Afinitor).  This is a targeted biological therapy or more accurate a mammalian target of rapamycin (mTOR) inhibitor. It is a type of treatment called a signal transduction inhibitor. Signal transduction inhibitors stop some of the signals within cells that make them grow and divide. Everolimus stops a particular protein called mTOR from working properly. mTOR controls other proteins that trigger cancer cells to grow. So everolimus helps to stop the cancer growing or may slow it down.

Sunitinib (Sutent).  This is a targeted biological therapy or more accurate a protein (or tyrosine) kinase inhibitor. Protein kinase is a type of chemical messenger (an enzyme) that plays a part in the growth of cancer cells. Sunitinib blocks the protein kinase to stop the cancer growing. It can stop the growth of a tumour or shrink it down.

I can only speculate why some of the confusion exists but I do have some personal experience I can quote too. Firstly I believe it could be easier for some people to describe the new agents as ‘chemotherapy’ rather than explain things such as somatostatin analogues, ‘mammalian target of rapamycin (mTOR) inhibitors’, protein kinase inhibitor or angiogenesis inhibitors. Another reason could be that health insurance companies do not have the correct database structures in place on their IT systems and therefore need to ‘pigeon hole’ drugs into the closest category they can see. Often this is chemotherapy and this only adds to the confusion. In the days when I had health insurance, my Lanreotide injections were coded as chemotherapy on all my bills. I challenged it and this is how they explained the issue.

I’m sure there’s other reasons.

Thanks for reading

Ronny

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Remember ….. in the war on Neuroendocrine Cancer, let’s not forget to win the battle for better quality of life!