Active hepatitis B or hepatitis C infection Known history of hepatitis C infection or suspected currently active hepatitis C infection; known or suspected history of hepatitis B infection will be excluded when any of the following conditions are met:\r\n* Received hematopoietic stem cell transplantation (either allogenic or autologous), or\r\n* Received any rituximab-containing treatment regimen in the last months before entering the study, or\r\n* Active hepatitis B as deemed by serology or viral load Active hepatitis B infection Active hepatitis C infection Active hepatitis A, B, or C infection. Has a known history of hepatitis B and/or hepatitis C infection Active hepatitis B and/or hepatitis C infection Active Hepatitis B or C infection Active hepatitis A, B, or C infection A history of active hepatitis B and/or hepatitis C infection Participant has known infection with hepatitis B or hepatitis C. Active hepatitis B and hepatitis C virus infection Patients with known active Hepatitis B or Hepatitis C infection Active hepatitis B or C infection Active hepatitis B or C infection Known hepatitis B or hepatitis C infection Active hepatitis B or C infection COHORT : ENDOMETRIAL CANCER: Patients who have known active hepatitis B, or hepatitis C infection Active Hepatitis C infection. Subjects who have been treated for Hepatitis C infection can be included if they have documented sustained virologic response of ? weeks. Has known active hepatitis B or hepatitis C virus infection. Known active hepatitis infection Active hepatitis B or hepatitis C infection Has an active bacterial, fungal, and/or known viral infection; patients with known human immunodeficiency virus (HIV) infection are excluded given the potential for interactions between antiretroviral agents and abemaciclib, and the potential for increased risk of life threatening infection with therapy that is myelosuppressive; patients with known hepatitis B or hepatitis C infection are excluded only if there is evidence of active infection (detectable hepatitis B surface antigen, detectable hepatitis C ribonucleic acid [RNA]) Active hepatitis B or C infection Active hepatitis A, B or C infection Clinically active infection with hepatitis B or hepatitis C virus Active infection with hepatitis B; active or chronic infection with hepatitis C Prior or ongoing liver disease including known cirrhosis, active hepatitis B or C infection; not to exclude patients with a distant history of resolved hepatitis A infection Known human immunodeficiency virus or hepatitis C infection only if the patient is taking medications that are excluded per protocol, active hepatitis B, or active hepatitis C infection. Active hepatitis B or C infection Active hepatitis B or C infection No active infection with Hepatitis B. No active infection with Hepatitis C. Known hepatitis B or C infection Active, uncontrolled infection including known hepatitis B or C Active infection with hepatitis B or hepatitis C virus Active hepatitis B or hepatitis C infection Known human immunodeficiency virus (HIV) infection; patients with active hepatitis B infection (not including patients with prior hepatitis B vaccination; or positive serum hepatitis B antibody); known hepatitis C infection is allowed as long as there is no active disease and is cleared by gastrointestinal (GI) consultation Active hepatitis B or hepatitis C infection Participants with active hepatitis A, B or C infection. Known active hepatitis B and/or hepatitis C infection Known active Hepatitis B or C infection Negative for hepatitis A, B, or C infection Patients with active hepatitis B and/or hepatitis C infection Active hepatitis B or hepatitis C infection Known active hepatitis B or C infection Any history of hepatitis B infection Must not have known active or clinically significant hepatitis A, B or C infection. Relapsed/refractory MCL: Known human immunodeficiency virus (HIV) infection; patients with active hepatitis B infection (not including patients with prior hepatitis B vaccination; or positive serum hepatitis B antibody); known hepatitis C infection is allowed as long as there is no active disease and is cleared by gastrointestinal (GI) consultation Newly diagnosed MCL: Known HIV infection; patients with active hepatitis B infection (not including patients with prior hepatitis B vaccination; or positive serum Hepatitis B antibody); known hepatitis C infection is allowed as long as there is no active disease and is cleared by GI consultation Patients with active hepatitis B and/or hepatitis C infection Active hepatitis B or C infection Known positivity for hepatitis B infection Known active hepatitis C infection Active, uncontrolled infection (e.g. Hepatitis A, B, or C) Known HIV infection or active Hepatitis B or Hepatitis C virus infection Subject has known active hepatitis B or hepatitis C infection. Active hepatitis B or hepatitis C infection at the time of screening Active viral hepatitis infection. Subjects with history of hepatitis infection that is not active are eligible. Active hepatitis B or hepatitis C infection Active hepatitis B or C infection Known human immunodeficiency virus (HIV) infection. Patients with active hepatitis B infection (not including patients with prior hepatitis B vaccination; or positive serum hepatitis B antibody). Known hepatitis C infection is allowed as long as there is no active disease. These patients should be optimized by GI consultation for hepatitis B and infectious disease consult for hepatitis C. Known human immunodeficiency virus (HIV) infection. Patients with active hepatitis B infection (not including patients with prior hepatitis B vaccination; or positive serum hepatitis B antibody). Known hepatitis C infection is allowed as long as there is no active disease and is cleared by GI consultation. Has known active hepatitis B or hepatitis C infection Known active hepatitis B or active hepatitis C infection; participants who have prior hepatitis C infection but who have received an antiviral treatment and show no detectable viral ribonucleic acid (RNA) for months after completion of treatment are eligible Active hepatitis B or C infection Known, active hepatitis A, B, or C infection Co-infection with hepatitis B Known active hepatitis A, B, or C infection that requires treatment Active infection with hepatitis B; active or chronic infection with hepatitis C Active hepatitis B or C infection Patients with active hepatitis B or active hepatitis C infection Active hepatitis B or C infection Active or latent hepatitis B or active hepatitis C (test within weeks of screening), or any uncontrolled infection at screening Active replication of or prior infection with hepatitis B or active hepatitis C( HCV RNA positive ) Active tuberculosis or recent (< week ago) clinically significant infection or evidence of active hepatitis B, hepatitis C or HIV infection Clinically active infection with hepatitis B or hepatitis C virus Active hepatitis B or C infection based on screening blood testing Active or latent hepatitis B or active hepatitis C (test within weeks of screening), or any uncontrolled infection at screening Active tuberculosis or recent (< week ago) clinically significant infection or evidence of active hepatitis B, hepatitis C or HIV infection. Has known active Hepatitis B or Hepatitis C infection. Recent (< week ago) clinically significant infection, active tuberculosis or evidence of active hepatitis B, hepatitis C or HIV infection No active infection with hepatitis B Known active hepatitis B or hepatitis C infection. Active infection or past hepatitis B or C infection Hepatitis B or C infection Known history of active hepatitis B or hepatitis C infection Active hepatitis B or hepatitis C infection Hepatitis B or C infection Active hepatitis B infection, active hepatitis C infection or known HIV carrier. Known clinically active infection with hepatitis B or hepatitis C virus Has active hepatitis B or hepatitis C infection, or co-infection with both hepatitis B and C virus Active hepatitis B or C infection Active, uncontrolled infection, including hepatitis B, hepatitis C Known human immunodeficiency virus (HIV) infection; patients with active hepatitis B infection (not including patients with prior hepatitis B vaccination; or positive serum hepatitis B antibody); hepatitis C infection is allowed as long as there is no active disease and is cleared by GI consultation Evidence of active hepatitis B (not including patients with prior hepatitis B vaccination; or positive serum hepatitis B antibody) or active hepatitis C infection; evidence of active human immunodeficiency virus (HIV) infection Known active hepatitis B or C infection No active hepatitis B or C infection Active hepatitis B infection, active hepatitis C infection Active hepatitis B or C infection. Active hepatitis B or C infection Participant has known active infection with hepatitis B or hepatitis C virus; hepatitis B and C serology testing is not required, unless active infection is suspected Known active hepatitis B or C infection Active hepatitis A, B, or C infection Active hepatitis B or hepatitis C infection Known human immunodeficiency virus (HIV) infection; patients with active hepatitis B infection (not including patients with prior hepatitis B vaccination; or positive serum hepatitis B antibody); known hepatitis C infection is allowed as long as there is no active disease and is cleared by gastrointestinal (GI) consultation Known active Hepatitis B or Hepatitis C virus infection Active hepatitis B or C infection Active hepatitis B or C infection Active hepatitis B or C infection Patients known to be positive for hepatitis B or to have active hepatitis C infection; Evidence of active or prior hepatitis infection. Known human immunodeficiency virus (HIV) infection; patients with active hepatitis B infection (not including patients with prior hepatitis B vaccination; or positive serum hepatitis B antibody); known hepatitis C infection is allowed as long as there is no active disease and is cleared by gastrointestinal (GI) consultation Active hepatitis B or C infection Active hepatitis B infection active hepatitis C infection and/or known HIV carrier. Evidence of hepatitis B infection Known active hepatitis B or C infection Active hepatitis B or C infection Active hepatitis B or C infection Patients with documented active hepatitis B or C infection Active hepatitis B or active hepatitis C infection Hepatitis B or hepatitis C active infection