Of these, seven have been withdrawn from marketing either due to lack of efficacy, poor toxicity to efficacy profiles, or lack of market interest (Table 1).
b Early complications refers to at least one of the following within the first 3 months: aGVHD of grade 2 or higher, intermediate or poor toxicity, or localized or systemic infection.
Early complications was defined as experiencing at least one of the following: aGVHD of grade 2 or higher, intermediate or poor toxicity (indicating intermediate or high levels of toxicity), or localized or systemic infection.
Chemotherapy is one of the most commonly used strategies in cancer therapy, but their efficacy is largely limited by suboptimal pharmacokinetic properties, such as low stability, poor absorption, toxicity, distribution, and elimination [2].
Fortunately, the environmental regulatory revolution of the last half-century is not substantially compromised as development of past regulatory guidance was designed to deal with limited amounts of relatively poor quality toxicity data.
Attempts have been made to inhibit the action of methanogens in the rumen using a variety of interventions but most have failed, or met with only limited success, due to low efficacy, poor selectivity, toxicity of compounds against the host, or build-up of resistance to anti-methanogen compounds [11].
However, the 7-month median survival was poor and toxicity high, limiting the value of this schedule in the treatment of MPM.
Success for the existing AUD treatments is only moderate and likely limited by poor compliance, toxicity, individual variation, and possibly lack of full efficacy.
Lastly, high levels of the profibrogenic cytokine TGF-β are associated with poor late toxicity outcomes [ 48– 50], but we did not observe a difference in the profibrotic cytokine levels at the end of the 28-day study.
Moreover, poor pharmacokinetics and toxicity are major causes of late stage failure in drug development.
The currently used antimalarials suffer drug resistance, non-specificity, toxicity, poor bioavailability, and water solubility [6].
