Role of Eltrombopag as First Line Therapy in Primary Immune Thrombocytopenia.

Study procedure After meeting inclusion and exclusion criteria patients will be thoroughly informed about the study, used drugs, randomization, risk and benefits, follow up. If they agree to participate in the study, their consent for this study will be taken and they will be enrolled in the study.

Detail history and clinical exam will be done. Key points are- History of spontaneous bleeding in last month, History of vaccination, History of recent viral infection, fever, Presence of organomegaly.

Primary investigation will be- CBC PBF, RBS, ANA, TSH, Anti H. pyloriIgG, Anti-HCV, APTT, BMS (if indicated)

NB:

1. If APTT is more than 10 sec of control, patient would be evaluated for Anti-Phospholipid Syndrome by anti-cardiolipin Antibody and Anti-beta2 glycoprotein1 Antibody
2. If Hemoglobin in less than 11.5gm/dL patient would be evaluated for Anemia by Iron Profile or Coomb's Test based on CBC parameter and PBF findings] Randomization: Enrolled patients would be divided into two groups (1:1) by block randomization. Block Randomization would be done by computer generated pattern. Actual randomization plan will be provided by Renata limited team who know about eltrombopag and placebo. Randomization allocation delivered only to the enrolling site study staff. A voluntary nurse will be in charge of enrolling the patients according to randomization plan.

Blinding and placebo control: It will be a double-blind study. Researchers nor participants will know who is getting placebo/eltromopag. One group will get Prednisolone \& Eltrombopag and another group will get Prednisolone \& Placebo. Eltrombopag, Prednisolone and Placebo will be provided by Renata Limited Bangladesh and patient will get at free of costs. Placebo will have same size, shape, color, markings, taste, smell and packaging like Eltrombopag. Eltrombopag and placebo will be provided in separate color-coded box marked-A (red) or B (green). Group A and Group B participants will be given colored cards (red and green) for identification. They will receive tablets from marked box. Researchers or any one related to the study in DMCH, patients \& their attendants no will know which box contain placebo or eltrombopag. Only respectable person of Renata limited will know the information. The team who knows the information will be head by their CEO. At the end point all data will be submitted to the team who know about placebo.

Experimental Group - Eltrombopag\& Prednisolone Control Group - Prednisolone and Placebo Dose- Prednisolone 1mg/kg/day for 28 days Eltrombopag/Placebo 25mg/day for 28 days Follow Up- Follow up at the end of 1st week, 2nd week and 4th week Patient would be evaluated in every follow up by history, physical examination and investigation. History of any spontaneous bleeding event, any discomfort or new symptoms science last follow up. General examination will be performed in every follow up. CBC, RBS, ALT, AST and creatinine will be done in every follow up.

Primary End Point-28 days after starting therapy. Complete Response is expected after 28 days of therapy.

Patient would continue therapy and follow up in OPD but would not be included in the study.

Supportive care and rescue- A Data and Safety Monitoring Board (DSMB) will be formed which will include two members of NREC, one hematologist and one medicine specialist. Any adverse event (Drugs side effects- headache, weight gain, changes in liver enzymes, high blood sugar) or serious adverse event (grade 3 or grade 4 bleeding, hospitalization, thrombosis) will be delt with proper medical care.

If any patient shows no response within 14 days and has grade 3 or 4 bleeding rescue with methyl prednisolone or IV Ig would be given and discontinued from study. If group A patient reaches platelet count >400x109\L, eltrombopag will be stopped.

Data Analysis After data collection data will be edited, cleaned and prepared for analysis at the end of the study. At the end of the study, all data will be submitted to the team who know about placebo/eltrombopag. The statistical analysis will be conducted using SPSS (statistical package for the social science) version 25 statistical software. The findings of the study will be presented by frequency and percentage in tables. Means and standard deviations for continuous variables and proportion for categorical variables will be used to describe the characteristics of the total sample. Association between two qualitative variables will be assessed by Chi-square test, where p\<0.05 with 95% confidence level will be considered as significant. Appropriate statistical tests will be done to interpret the findings of the study.