Analysis reveals adverse effects of complex cancer therapies called antibody drug conjugates

Over the past two decades, numerous complex cancer therapies called antibody drug conjugates (ADCs) have been tested in clinical trials and approved for use in patients. Investigators recently performed a comprehensive analysis of multiple scientific databases to outline the potential toxicities associated with these medications. Their findings are published by Wiley online in CANCER, a peer-reviewed journal of the American Cancer Society.

An ADC has a complex structure comprised of an antibody that targets a protein expressed on cancer cells, a toxic compound to kill the targeted cells (also called a payload or warhead), and a linker to join the two. The clinical efficacy and toxicity of ADCs are affected by each component.

In 2000, gemtuzumab ozogamicin was the first ADC approved by the US Food and Drug Administration, and more than a dozen ADCs have been approved worldwide to date. To investigate the side effects associated with different ADCs, a team led by Prof. Hong Zhu of Xiangya Hospital, Central South University, in China, conducted a systematic review and meta-analysis of published clinical trials of ADCs that reported treatment-related toxicities.

The researchers uncovered 169 relevant trials involving 22,492 patients. The incidence of treatment-related adverse events was 91.2% for all events and 46.1% for serious adverse events (grade 3 or higher). The most common adverse events overall were lymphopenia (too few white blood cells), nausea, neutropenia (too few neutrophils, a type of white blood cell), vision blurriness, and peripheral neuropathy (nerve pain in the hands and feet). The most common serious adverse events were neutropenia, hypoesthesia (insensitivity), thrombocytopenia (too few blood platelets), neutropenia with fever, and lymphopenia. Certain ADCs were linked with higher average incidences of adverse events.

“Different ADCs appear to vary in their treatment-related adverse events. Our results provide an important reference for clinicians and patients on how to address ADCs’ toxicity in clinical practice,” said Prof. Zhu.

About the Journal
CANCER is a peer-reviewed publication of the American Cancer Society integrating scientific information from worldwide sources for all oncologic specialties. The objective of CANCER is to provide an interdisciplinary forum for the exchange of information among oncologic disciplines concerned with the etiology, course, and treatment of human cancer. CANCER is published on behalf of the American Cancer Society by Wiley and can be accessed online. Follow us on Twitter @JournalCancer

About Wiley 

Wiley is one of the world’s largest publishers and a global leader in scientific research and career-connected education. Founded in 1807, Wiley enables discovery, powers education, and shapes workforces. Through its industry-leading content, digital platforms, and knowledge networks, the company delivers on its timeless mission to unlock human potential. Visit us at Wiley.com. Follow us on Facebook, Twitter, LinkedIn and Instagram.