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Best of ASH (Part Four)

Posted on January 16 2014 by Pat Killingsworth | 748 views

During a presentation at our monthly Nature Coast Multiple Myeloma Support Group meeting last evening, oncologist Dr. Vikas Malhotra, reviewed the Multiple Myeloma Research Foundation’s (MMRF) Best of ASH power point presentation.  Near the end, an experimental drug, indatuximab ravtansine, was listed as part of a short list of exciting new myeloma therapies.  No one was familiar with the drug, so I decided to do some checking today.

Turns Dr. Vikas Malholtraout I would have recognized it had the number designation been used; BT-062.

BT-062 has been around for a while.  Developed by a German company, Biotest Pharmaceuticals, BT-062 is a genetically engineered monoclonal antibody conjugate.  It was one of the “hot” new therapies featured at ASH in 2011.  Then it drifted out of sight while their primary clinical trial recruited, getting off to a slow start.

But now BT-062 is back.  Here’s the company’s post ASH press release:

News: Biotest AG: Clinical Study with Indatuximab Ravtansine (BT-062) in Multiple Myeloma shows good Tolerability and encouraging Efficacy in Combination with Lenalidomide and Dexamethasone

Clinical Study with Indatuximab Ravtansine (BT-062) in Multiple Myeloma shows good Tolerability and encouraging Efficacy in Combination with Lenalidomide and Dexamethasone.

- Efficacy and tolerability data from combination therapy study 983 presented at 55th annual conference of the American Society of Hematology (ASH)

- Good tolerability of combination therapy with indatuximab ravtansine (BT-062) at a dosage up to 100 mg/m2

- Clinical benefit seen in all evaluable patients

- Complete response observed in individual patients

- Response to treatment also achieved in patients refractory (resistant) to prior therapy with lenalidomide and dexamethasone

- Study in solid tumors submitted to European authorities

Dreieich, 10 December 2013. Biotest AG is pursuing an innovative therapeutic strategy using the antibody-drug conjugate (ADC), indatuximab ravtansine (BT-062), which consists of a monoclonal antibody and a highly potent cytotoxic maytansine derivative (DM4) and linker developed by ImmunoGen, Inc. (Nasdaq: IMGN), to treat multiple myeloma, an aggressive malignant hematologic disease.

New clinical data derived from an ongoing combination study with indatuximab ravtansine (BT-062) were discussed in an oral presentation at the 55th Annual meeting of the American Society of Hematology (ASH) in New Orleans. The phase I/IIa study (Study 983) is investigating the safety and efficacy of indatuximab ravtansine (BT-062) in combination with lenalidomide and dexamethasone in patients with relapsed (recurring) or relapsed/refractory (resistent) multiple myeloma. These data will be the basis for further clinical development of indatuximab ravtansine (BT-062) in multiple myeloma.

In Study 983, to date 21 patients were treated with indatuximab ravtansine (BT-062) on days 1, 8, and 15 in combination with lenalidomide and dexamethasone in a 4-week cycle. Treatment cycles were repeated until progression of the underlying disease or occurrence of unacceptable toxicities.
To be eligible for enrollment, patients must have relapsed or relapsed/refractory multiple myeloma; patient could previously have been treated with lenalidomide and/or dexamethasone.
In the Phase I portion of the trial, three different doses of indatuximab ravtansine (BT-062) – 80, 100, 120 mg/m2 – were evaluated in combination with lenalidomide and dexamethasone to establish the maximum tolerated dose (MTD) of BT-062 when used with these drugs. indatuximab ravtansine (BT-062) was then evaluated at its MTD (100 mg/m2), with lenalidomide/ dexamethasone in additional patients.
The available data indicate that indatuximab ravtansine (BT-062) is well tolerated in the combination regimen at doses of up to 100 mg/m² (MTD). Efficacy was evaluated based on patients for whom at least two efficacy assessments after start of treatment were available.

Preliminary efficacy evaluation from 15 patients across all dose levels reveals that 100 % of the heavily pretreated patients had clinical benefit from the therapy, achieving stable disease or better. Eleven of these patients achieved a partial up to a complete response, resulting in an objective response rate of 73%.

- A comparable objective response rate of 75% was also obtained in a subgroup of patients who were refractory to prior therapy with lenalidomide and dexamethasone.

- For eight out of nine evaluated patients treated at the MTD of 100 mg/m², partial response or better with an objective response rate of 89% was observed.

At this phase II dose level of 100 mg/m² (MTD) a total of 37 patients will be treated to further evaluate the safety and efficacy in a larger number of patients.
These data will be the basis for further clinical development of indatuximab ravtansine (BT-062) in multiple myeloma.

Moreover, Biotest submitted a phase I/IIa study (Study 989) in solid tumors to the European authorities. Triple negative metastatic breast and metastatic urinary bladder cancer were selected based on the convincing preclinical data and a comprehensive medical need analysis. The recruitment of patients into the study is planned for beginning of 2014.

About indatuximab ravtansine (BT-062):
Indatuximab ravtansine (BT-062) is an antibody-drug conjugate consisting of a monoclonal antibody and a highly potent cytotoxic maytansine derivative (DM4). The antibody binds specifically to the antigen CD138, which is over-expressed on multiple myeloma cells and a variety of solid tumors.

Once the conjugate is internalized into the target cell, the DM4 is released from the targeting molecule, thereby restoring its original cytotoxic potency. This combination of high efficacy and specificity with low systemic toxicity sets indatuximab ravtansine
(BT-062) apart from most therapies currently used to treat multiple myeloma.

About the Trial (Study No. 983)

This phase I/IIa trial is designed to evaluate indatuximab ravtansine (BT-062) (administered days 1, 8 and 15, every 4 weeks) when used in combination with lenalidomide/dexamethasone to treat patients with relapsed or relapsed/refractory multiple myeloma. To qualify for enrollment, patients must have received at least one prior treatment regimen, which could include lenalidomide and/or dexamethasone.

In the phase I part of the trial, patients were administered increasing doses of indatuximab ravtansine (BT-062) to determine its MTD when used in combination with lenalidomide and dexamethasone. In the Phase IIa part, indatuximab ravtansine
(BT-062) is being administered at its MTD to further assess its safety and efficacy in combination with lenalidomide/dexamethasone.


This document contains forward-looking statements on overall economic development as well as on the business, earnings, financial and assets position of Biotest AG and its subsidiaries. These statements are based on current plans, estimates, forecasts and expectations of the company and are thus subject to risks and elements of uncertainty that could result in significant deviation of actual developments from expected developments. The forward-looking statements are only valid at the time of publication. Biotest does not intend to update the forward-looking statements and assumes no obligation to do so.

About Biotest

Biotest is a provider of plasma proteins and biotherapeutic drugs. With a value added chain that extends from pre-clinical and clinical development to worldwide sales, Biotest has specialised primarily in the areas of clinical immunology, haematology and intensive medicine. Biotest develops and markets immunoglobulins, coagulation factors and albumins based on human blood plasma. These are used for diseases of the immune and haematopoietic systems. In addition Biotest develops monoclonal antibodies in the indications of rheumatoid arthritis and cancer of plasma cells, which are produced by recombinant technologies. Biotest has about 1.900 employees worldwide. The preference shares of Biotest AG are listed in the SDAX on the Frankfurt stock exchange.

Biotest is still recruiting patients to participate in one or more BT-062 trials.  Here are links to Mayo Clinic’s and if you would like more details:

ASH-logo-purpleIn the end, its hard to tell which of these new, combination therapy drugs will stick, and which ones will fall by the wayside.  panobinostat had lost steam and dropped out of sight for a while.  Yet this year, panobinostat was creating significant “buzz” again at ASH.

I say, approve them all!  Make drugs like BT-062 available as quickly as possible.  If they only help 10% of patients, so be it.  If we can’t outsmart myeloma, let’s pile on!   Stick and move.  Stay ahead of it, changing therapy combinations before the myeloma cells become resistant.  The strategy takes a flexible, nimble specialist.  But that’s why they get the big bucks!

Feel good and keep smiling!  Pat

2 Comments For This Post

  1. joe Says:

    good news.

  2. Pat Killingsworth Says:

    Joe is a regular reader. Man of few words. Love that about you, Joe!

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