An adverse event (AE) is any untoward medical occurrence in a clinical trial participant regardless of causal relationship to study drug and regardless whether study drug has been administered. A serious adverse event (SAE) is any untoward medical occurrence or effect that at any dose results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability / incapacity, is a congenital anomaly / birth defect or is medically important due to other reasons than the above mentioned criteria. A non-serious AE is any AE that does not meet the criteria above.

Safety set includes all patients who received at least one dose of study drug and had at least one post-baseline safety assessment.

Spleen length was assessed by manual palpation. Assessment of spleen response was repeated until early discontinuation of the study drug and also at study completion (28 days post end of treatment visit).

Full analysis set includes all patients who received at least one administration of study drug.

Overall response is analyzed using the spleen response, as assessed by the investigator and also by deriving the response using International Working Group-Myeloproliferative Neoplasms Research and Treatment (IWG-MRT) criteria.

Participants with spleen length at baseline between 5 and 10 cm were reported as Responders if reporting non palpable spleen; Stable disease does not meet criteria for response or disease progression and Progressive disease with an increase of 100% from baseline in spleen length.

Participants with spleen length at baseline more than 10 cm were reported as Responders with spleen reduction of 50% from baseline; Stable disease does not meet criteria for response or disease progression and Progressive disease with an increase of 50% from baseline in spleen length.

Full analysis set includes all patients who received at least one administration of study drug and were observed from baseline in to the study follow-up period.

ECOG Performance Score has 5 grades. 0 = Fully active, able to carry out all pre-disease activities; 1 = Restricted in strenuous activity but ambulatory and able to carry out work of light or sedentary nature; 2 = Ambulatory and capable of all self-care but unable to carry out work activities. Active about 50% of waking hours; 3 = Capable of limited self-care, confined to bed/chair more than 50% of waking hours; 4 = Completely disabled; cannot carry on self-care. Totally confined to bed/chair. 5 = Death.

Full analysis set includes all patients who received at least one administration of study drug.

The FACT-Lym questionnaire consists of a total of 42 questions divided between five subscales (i.e., physical well-being, social/family well-being, emotional well-being, functional well-being and lymphoma subscale). Each subscale questionnaire rates each question on a 5-point scale from 0 = Not at all to 4 = Very much. These scores were summed to three total sum scores, namely FACT-Lym score, FACT-Lym Trial Outcome Index (TOI), FACT-General (FACT-G) and FACT-Lym total score. Total scores: FACT-Lym=0-60, FACT-TOI=0-116, FACT-G total=0-108, FACT-Lym Total= 0-168. Higher scores are reflective of better HRQoL.

Full analysis set includes all patients who received at least one administration of study drug.

Improvement was defined by the upper limit of the minimally important difference (MID). Patients with the best possible score at Baseline were excluded from this analysis because their HRQoL cannot be further improved. Responders and non-responders for each endpoint were defined based on change from baseline scores using pre specified cut-off points. Patients with an improved score compared to Baseline, for which the magnitude of the change was at least the cutoff value, were classified as responders; otherwise, as non-responders. The responder cutoff: ECOG cutoff=1, range=0 to 5, FACT-Lym cutoff=5.4, range 0-60, FACIT-Fatigue =5 and range=0-52.The median time to first improvement was estimated using the Kaplan Meier method and time to improvement event was determined based on upper bound of the MID. The time to improvement was calculated from the date of first study drug administration.

Full analysis set includes all patients who received at least one administration of study drug.

Percentage of patients requiring medical resources (blood transfusions, hospitalization, emergency room visits, general practitioners or specialists consultations, urgent care or splenic irradiation) up to 5 years.

Full analysis set includes all patients who received at least one administration of study drug.